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	# Configure.ac script for Libgcrypt
	# Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006,
	# 2007, 2008, 2009, 2011 Free Software Foundation, Inc.
	# Copyright (C) 2012-2021 g10 Code GmbH
	#
	# This file is part of Libgcrypt.
	#
	# Libgcrypt is free software; you can redistribute it and/or modify
	# it under the terms of the GNU Lesser General Public License as
	# published by the Free Software Foundation; either version 2.1 of
	# the License, or (at your option) any later version.
	#
	# Libgcrypt is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU Lesser General Public License for more details.
	#
	# You should have received a copy of the GNU Lesser General Public
	# License along with this program; if not, see <http://www.gnu.org/licenses/>.

	# (Process this file with autoconf to produce a configure script.)
	AC_REVISION($Revision$)
	AC_PREREQ([2.60])
	min_automake_version="1.14"

	# To build a release you need to create a tag with the version number
	# (git tag -s libgcrypt-n.m.k) and run "./autogen.sh --force". Please
	# bump the version number immediately after the release and do another
	# commit and push so that the git magic is able to work. See below
	# for the LT versions.
	m4_define([mym4_package],[libgcrypt])
	m4_define([mym4_major], [1])
	m4_define([mym4_minor], [9])
	m4_define([mym4_micro], [3])

	# Below is m4 magic to extract and compute the git revision number,
	# the decimalized short revision number, a beta version string and a
	# flag indicating a development version (mym4_isbeta). Note that the
	# m4 processing is done by autoconf and not during the configure run.
	m4_define([mym4_verslist], m4_split(m4_esyscmd([./autogen.sh --find-version] \
	mym4_package mym4_major mym4_minor mym4_micro),[:]))
	m4_define([mym4_isbeta], m4_argn(2, mym4_verslist))
	m4_define([mym4_version], m4_argn(4, mym4_verslist))
	m4_define([mym4_revision], m4_argn(7, mym4_verslist))
	m4_define([mym4_revision_dec], m4_argn(8, mym4_verslist))
	m4_esyscmd([echo ]mym4_version[>VERSION])
	AC_INIT([mym4_package],[mym4_version],[https://bugs.gnupg.org])

	# LT Version numbers, remember to change them just before a release.
	# (Code changed: REVISION++)
	# (Interfaces added/removed/changed: CURRENT++, REVISION=0)
	# (Interfaces added: AGE++)
	# (Interfaces removed: AGE=0)
	#
	# (Interfaces removed: CURRENT++, AGE=0, REVISION=0)
	# (Interfaces added: CURRENT++, AGE++, REVISION=0)
	# (No interfaces changed: REVISION++)
	LIBGCRYPT_LT_CURRENT=23
	LIBGCRYPT_LT_AGE=3
	LIBGCRYPT_LT_REVISION=2
	################################################

	AC_SUBST(LIBGCRYPT_LT_CURRENT)
	AC_SUBST(LIBGCRYPT_LT_AGE)
	AC_SUBST(LIBGCRYPT_LT_REVISION)

	# If the API is changed in an incompatible way: increment the next counter.
	#
	# 1.6: ABI and API change but the change is to most users irrelevant
	# and thus the API version number has not been incremented.
	LIBGCRYPT_CONFIG_API_VERSION=1

	# If you change the required gpg-error version, please remove
	# unnecessary error code defines in src/gcrypt-int.h.
	NEED_GPG_ERROR_VERSION=1.27

	AC_CONFIG_AUX_DIR([build-aux])
	AC_CONFIG_SRCDIR([src/libgcrypt.vers])
	AM_INIT_AUTOMAKE([serial-tests dist-bzip2])
	AC_CONFIG_HEADER(config.h)
	AC_CONFIG_MACRO_DIR([m4])
	AC_CONFIG_LIBOBJ_DIR([compat])
	AC_CANONICAL_HOST
	AM_MAINTAINER_MODE
	AM_SILENT_RULES

	AC_ARG_VAR(SYSROOT,[locate config scripts also below that directory])

	AH_TOP([
	#ifndef _GCRYPT_CONFIG_H_INCLUDED
	#define _GCRYPT_CONFIG_H_INCLUDED

	/* Enable gpg-error's strerror macro for W32CE. */
	#define GPG_ERR_ENABLE_ERRNO_MACROS 1
	])

	AH_BOTTOM([
	#define _GCRYPT_IN_LIBGCRYPT 1

	/* Add .note.gnu.property section for Intel CET in assembler sources
	when CET is enabled. */
	#if defined(__ASSEMBLER__) && defined(__CET__)
	# include <cet.h>
	#endif

	/* If the configure check for endianness has been disabled, get it from
	OS macros. This is intended for making fat binary builds on OS X. */
	#ifdef DISABLED_ENDIAN_CHECK
	# if defined(__BIG_ENDIAN__)
	# define WORDS_BIGENDIAN 1
	# elif defined(__LITTLE_ENDIAN__)
	# undef WORDS_BIGENDIAN
	# else
	# error "No endianness found"
	# endif
	#endif /DISABLED_ENDIAN_CHECK/

	/* We basically use the original Camellia source. Make sure the symbols
	properly prefixed. */
	#define CAMELLIA_EXT_SYM_PREFIX _gcry_

	#endif /_GCRYPT_CONFIG_H_INCLUDED/
	])

	AH_VERBATIM([_REENTRANT],
	[/* To allow the use of Libgcrypt in multithreaded programs we have to use
	special features from the library. */
	#ifndef _REENTRANT
	# define _REENTRANT 1
	#endif
	])


	######################
	## Basic checks. ### (we need some results later on (e.g. $GCC)
	######################

	AC_PROG_MAKE_SET
	missing_dir=`cd $ac_aux_dir && pwd`
	AM_MISSING_PROG(ACLOCAL, aclocal, $missing_dir)
	AM_MISSING_PROG(AUTOCONF, autoconf, $missing_dir)
	AM_MISSING_PROG(AUTOMAKE, automake, $missing_dir)
	AM_MISSING_PROG(AUTOHEADER, autoheader, $missing_dir)
	# AM_MISSING_PROG(MAKEINFO, makeinfo, $missing_dir)
	AC_PROG_CC
	AC_PROG_CPP
	AM_PROG_CC_C_O
	AM_PROG_AS
	AC_SEARCH_LIBS([strerror],[cposix])
	AC_PROG_INSTALL
	AC_PROG_AWK

	AC_USE_SYSTEM_EXTENSIONS

	# Taken from mpfr-4.0.1, then modified for LDADD_FOR_TESTS_KLUDGE
	dnl Under Linux, make sure that the old dtags are used if LD_LIBRARY_PATH
	dnl is defined. The issue is that with the new dtags, LD_LIBRARY_PATH has
	dnl the precedence over the run path, so that if a compatible MPFR library
	dnl is installed in some directory from $LD_LIBRARY_PATH, then the tested
	dnl MPFR library will be this library instead of the MPFR library from the
	dnl build tree. Other OS with the same issue might be added later.
	dnl
	dnl References:
	dnl https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=859732
	dnl http://lists.gnu.org/archive/html/libtool/2017-05/msg00000.html
	dnl
	dnl We need to check whether --disable-new-dtags is supported as alternate
	dnl linkers may be used (e.g., with tcc: CC=tcc LD=tcc).
	dnl
	case $host in
	--linux*)
	if test -n "$LD_LIBRARY_PATH"; then
	saved_LDFLAGS="$LDFLAGS"
	LDADD_FOR_TESTS_KLUDGE="-Wl,--disable-new-dtags"
	LDFLAGS="$LDFLAGS $LDADD_FOR_TESTS_KLUDGE"
	AC_MSG_CHECKING(whether --disable-new-dtags is supported by the linker)
	AC_LINK_IFELSE([AC_LANG_SOURCE([[
	int main (void) { return 0; }
	]])],
	[AC_MSG_RESULT(yes (use it since LD_LIBRARY_PATH is set))],
	[AC_MSG_RESULT(no)
	LDADD_FOR_TESTS_KLUDGE=""
	])
	LDFLAGS="$saved_LDFLAGS"
	fi
	;;
	esac
	AC_SUBST([LDADD_FOR_TESTS_KLUDGE])

	VERSION_NUMBER=m4_esyscmd(printf "0x%02x%02x%02x" mym4_major \
	mym4_minor mym4_micro)
	AC_SUBST(VERSION_NUMBER)

	# We need to compile and run a program on the build machine.
	AX_CC_FOR_BUILD


	LT_PREREQ([2.2.6])
	LT_INIT([win32-dll disable-static])
	LT_LANG([Windows Resource])


	##########################
	## General definitions. ##
	##########################

	# Used by libgcrypt-config
	LIBGCRYPT_CONFIG_LIBS="-lgcrypt"
	LIBGCRYPT_CONFIG_CFLAGS=""
	LIBGCRYPT_CONFIG_HOST="$host"

	# Definitions for symmetric ciphers.
	available_ciphers="arcfour blowfish cast5 des aes twofish serpent rfc2268 seed"
	available_ciphers="$available_ciphers camellia idea salsa20 gost28147 chacha20"
	available_ciphers="$available_ciphers sm4"
	enabled_ciphers=""

	# Definitions for public-key ciphers.
	available_pubkey_ciphers="dsa elgamal rsa ecc"
	enabled_pubkey_ciphers=""

	# Definitions for message digests.
	available_digests="crc gostr3411-94 md2 md4 md5 rmd160 sha1 sha256 sha512"
	available_digests="$available_digests sha3 tiger whirlpool stribog blake2"
	available_digests="$available_digests sm3"
	enabled_digests=""

	# Definitions for kdfs (optional ones)
	available_kdfs="s2k pkdf2 scrypt"
	enabled_kdfs=""

	# Definitions for random modules.
	available_random_modules="linux egd unix"
	auto_random_modules="$available_random_modules"

	# Supported thread backends.
	LIBGCRYPT_THREAD_MODULES=""

	# Other definitions.
	have_w32_system=no
	have_w32ce_system=no
	have_pthread=no


	# Setup some stuff depending on host.
	case "${host}" in
	--mingw32*)
	ac_cv_have_dev_random=no
	have_w32_system=yes
	case "${host}" in
	-mingw32ce)
	have_w32ce_system=yes
	available_random_modules="w32ce"
	;;
	*)
	available_random_modules="w32"
	;;
	esac
	AC_DEFINE(USE_ONLY_8DOT3,1,
	[set this to limit filenames to the 8.3 format])
	AC_DEFINE(HAVE_DRIVE_LETTERS,1,
	[defined if we must run on a stupid file system])
	AC_DEFINE(HAVE_DOSISH_SYSTEM,1,
	[defined if we run on some of the PCDOS like systems
	(DOS, Windoze. OS/2) with special properties like
	no file modes])
	;;

	i?86-emx-os2 \| i?86--os2emx)
	# OS/2 with the EMX environment
	ac_cv_have_dev_random=no
	AC_DEFINE(HAVE_DRIVE_LETTERS)
	AC_DEFINE(HAVE_DOSISH_SYSTEM)
	;;

	i?86--msdosdjgpp)
	# DOS with the DJGPP environment
	ac_cv_have_dev_random=no
	AC_DEFINE(HAVE_DRIVE_LETTERS)
	AC_DEFINE(HAVE_DOSISH_SYSTEM)
	;;

	--hpux*)
	if test -z "$GCC" ; then
	CFLAGS="$CFLAGS -Ae -D_HPUX_SOURCE"
	fi
	;;
	-dec-osf4)
	if test -z "$GCC" ; then
	# Suppress all warnings
	# to get rid of the unsigned/signed char mismatch warnings.
	CFLAGS="$CFLAGS -w"
	fi
	;;
	m68k-atari-mint)
	;;
	-apple-darwin)
	AC_DEFINE(_DARWIN_C_SOURCE, 900000L,
	Expose all libc features (__DARWIN_C_FULL).)
	AC_DEFINE(USE_POSIX_SPAWN_FOR_TESTS, 1,
	[defined if we use posix_spawn in test program])
	AC_CHECK_HEADERS(spawn.h)
	;;
	*)
	;;
	esac

	if test "$have_w32_system" = yes; then
	AC_DEFINE(HAVE_W32_SYSTEM,1, [Defined if we run on a W32 API based system])
	if test "$have_w32ce_system" = yes; then
	AC_DEFINE(HAVE_W32CE_SYSTEM,1,[Defined if we run on WindowsCE])
	fi
	fi
	AM_CONDITIONAL(HAVE_W32_SYSTEM, test "$have_w32_system" = yes)
	AM_CONDITIONAL(HAVE_W32CE_SYSTEM, test "$have_w32ce_system" = yes)



	# A printable OS Name is sometimes useful.
	case "${host}" in
	--mingw32ce*)
	PRINTABLE_OS_NAME="W32CE"
	;;

	--mingw32*)
	PRINTABLE_OS_NAME="W32"
	;;

	i?86-emx-os2 \| i?86--os2emx )
	PRINTABLE_OS_NAME="OS/2"
	;;

	i?86--msdosdjgpp)
	PRINTABLE_OS_NAME="MSDOS/DJGPP"
	;;

	-linux)
	PRINTABLE_OS_NAME="GNU/Linux"
	;;

	*)
	PRINTABLE_OS_NAME=`uname -s \|\| echo "Unknown"`
	;;
	esac

	NAME_OF_DEV_RANDOM="/dev/random"
	NAME_OF_DEV_URANDOM="/dev/urandom"

	AC_ARG_ENABLE(endian-check,
	AS_HELP_STRING([--disable-endian-check],
	[disable the endian check and trust the OS provided macros]),
	endiancheck=$enableval,endiancheck=yes)
	if test x"$endiancheck" = xyes ; then
	AC_C_BIGENDIAN
	else
	AC_DEFINE(DISABLED_ENDIAN_CHECK,1,[configure did not test for endianness])
	fi

	AC_CHECK_SIZEOF(unsigned short, 2)
	AC_CHECK_SIZEOF(unsigned int, 4)
	AC_CHECK_SIZEOF(unsigned long, 4)
	AC_CHECK_SIZEOF(unsigned long long, 0)
	AC_CHECK_SIZEOF(void *, 0)

	AC_TYPE_UINTPTR_T

	if test "$ac_cv_sizeof_unsigned_short" = "0" \
	\|\| test "$ac_cv_sizeof_unsigned_int" = "0" \
	\|\| test "$ac_cv_sizeof_unsigned_long" = "0"; then
	AC_MSG_WARN([Hmmm, something is wrong with the sizes - using defaults]);
	fi

	# Ensure that we have UINT64_C before we bother to check for uint64_t
	AC_CACHE_CHECK([for UINT64_C],[gnupg_cv_uint64_c_works],
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <inttypes.h>]],
	[[uint64_t foo=UINT64_C(42);]])],
	gnupg_cv_uint64_c_works=yes,gnupg_cv_uint64_c_works=no))
	if test "$gnupg_cv_uint64_c_works" = "yes" ; then
	AC_CHECK_SIZEOF(uint64_t)
	fi

	# Do we have any 64-bit data types?
	if test "$ac_cv_sizeof_unsigned_int" != "8" \
	&& test "$ac_cv_sizeof_unsigned_long" != "8" \
	&& test "$ac_cv_sizeof_unsigned_long_long" != "8" \
	&& test "$ac_cv_sizeof_uint64_t" != "8"; then
	AC_MSG_ERROR([[
	***
	*** No 64-bit integer type available.
	*** It is not possible to build Libgcrypt on this platform.
	***]])
	fi


	# If not specified otherwise, all available algorithms will be
	# included.
	default_ciphers="$available_ciphers"
	default_pubkey_ciphers="$available_pubkey_ciphers"
	default_digests="$available_digests"
	default_kdfs="$available_kdfs"
	# Blacklist MD2 by default
	default_digests=`echo $default_digests \| sed -e 's/md2//g'`

	# Substitutions to set generated files in a Emacs buffer to read-only.
	AC_SUBST(emacs_local_vars_begin, ['Local Variables:'])
	AC_SUBST(emacs_local_vars_read_only, ['buffer-read-only: t'])
	AC_SUBST(emacs_local_vars_end, ['End:'])

	############################
	## Command line switches. ##
	############################

	# Implementation of the --enable-ciphers switch.
	AC_ARG_ENABLE(ciphers,
	AS_HELP_STRING([--enable-ciphers=ciphers],
	[select the symmetric ciphers to include]),
	[enabled_ciphers=`echo $enableval \| tr ',:' ' ' \| tr '[A-Z]' '[a-z]'`],
	[enabled_ciphers=""])
	if test "x$enabled_ciphers" = "x" \
	-o "$enabled_ciphers" = "yes" \
	-o "$enabled_ciphers" = "no"; then
	enabled_ciphers=$default_ciphers
	fi
	AC_MSG_CHECKING([which symmetric ciphers to include])
	for cipher in $enabled_ciphers; do
	LIST_MEMBER($cipher, $available_ciphers)
	if test "$found" = "0"; then
	AC_MSG_ERROR([unsupported cipher "$cipher" specified])
	fi
	done
	AC_MSG_RESULT([$enabled_ciphers])

	# Implementation of the --enable-pubkey-ciphers switch.
	AC_ARG_ENABLE(pubkey-ciphers,
	AS_HELP_STRING([--enable-pubkey-ciphers=ciphers],
	[select the public-key ciphers to include]),
	[enabled_pubkey_ciphers=`echo $enableval \| tr ',:' ' ' \| tr '[A-Z]' '[a-z]'`],
	[enabled_pubkey_ciphers=""])
	if test "x$enabled_pubkey_ciphers" = "x" \
	-o "$enabled_pubkey_ciphers" = "yes" \
	-o "$enabled_pubkey_ciphers" = "no"; then
	enabled_pubkey_ciphers=$default_pubkey_ciphers
	fi
	AC_MSG_CHECKING([which public-key ciphers to include])
	for cipher in $enabled_pubkey_ciphers; do
	LIST_MEMBER($cipher, $available_pubkey_ciphers)
	if test "$found" = "0"; then
	AC_MSG_ERROR([unsupported public-key cipher specified])
	fi
	done
	AC_MSG_RESULT([$enabled_pubkey_ciphers])

	# Implementation of the --enable-digests switch.
	AC_ARG_ENABLE(digests,
	AS_HELP_STRING([--enable-digests=digests],
	[select the message digests to include]),
	[enabled_digests=`echo $enableval \| tr ',:' ' ' \| tr '[A-Z]' '[a-z]'`],
	[enabled_digests=""])
	if test "x$enabled_digests" = "x" \
	-o "$enabled_digests" = "yes" \
	-o "$enabled_digests" = "no"; then
	enabled_digests=$default_digests
	fi
	AC_MSG_CHECKING([which message digests to include])
	for digest in $enabled_digests; do
	LIST_MEMBER($digest, $available_digests)
	if test "$found" = "0"; then
	AC_MSG_ERROR([unsupported message digest specified])
	fi
	done
	AC_MSG_RESULT([$enabled_digests])

	# Implementation of the --enable-kdfs switch.
	AC_ARG_ENABLE(kdfs,
	AS_HELP_STRING([--enable-kfds=kdfs],
	[select the KDFs to include]),
	[enabled_kdfs=`echo $enableval \| tr ',:' ' ' \| tr '[A-Z]' '[a-z]'`],
	[enabled_kdfs=""])
	if test "x$enabled_kdfs" = "x" \
	-o "$enabled_kdfs" = "yes" \
	-o "$enabled_kdfs" = "no"; then
	enabled_kdfs=$default_kdfs
	fi
	AC_MSG_CHECKING([which key derivation functions to include])
	for kdf in $enabled_kdfs; do
	LIST_MEMBER($kdf, $available_kdfs)
	if test "$found" = "0"; then
	AC_MSG_ERROR([unsupported key derivation function specified])
	fi
	done
	AC_MSG_RESULT([$enabled_kdfs])

	# Implementation of the --enable-random switch.
	AC_ARG_ENABLE(random,
	AS_HELP_STRING([--enable-random=name],
	[select which random number generator to use]),
	[random=`echo $enableval \| tr '[A-Z]' '[a-z]'`],
	[])
	if test "x$random" = "x" -o "$random" = "yes" -o "$random" = "no"; then
	random=default
	fi
	AC_MSG_CHECKING([which random module to use])
	if test "$random" != "default" -a "$random" != "auto"; then
	LIST_MEMBER($random, $available_random_modules)
	if test "$found" = "0"; then
	AC_MSG_ERROR([unsupported random module specified])
	fi
	fi
	AC_MSG_RESULT($random)

	# Implementation of the --disable-dev-random switch.
	AC_MSG_CHECKING([whether use of /dev/random is requested])
	AC_ARG_ENABLE(dev-random,
	[ --disable-dev-random disable the use of dev random],
	try_dev_random=$enableval, try_dev_random=yes)
	AC_MSG_RESULT($try_dev_random)

	# Implementation of the --with-egd-socket switch.
	AC_ARG_WITH(egd-socket,
	[ --with-egd-socket=NAME Use NAME for the EGD socket)],
	egd_socket_name="$withval", egd_socket_name="" )
	AC_DEFINE_UNQUOTED(EGD_SOCKET_NAME, "$egd_socket_name",
	[Define if you don't want the default EGD socket name.
	For details see cipher/rndegd.c])

	# Implementation of the --enable-random-daemon
	AC_MSG_CHECKING([whether the experimental random daemon is requested])
	AC_ARG_ENABLE([random-daemon],
	AS_HELP_STRING([--enable-random-daemon],
	[Build and support the experimental gcryptrnd]),
	[use_random_daemon=$enableval],
	[use_random_daemon=no])
	AC_MSG_RESULT($use_random_daemon)
	if test x$use_random_daemon = xyes ; then
	AC_DEFINE(USE_RANDOM_DAEMON,1,
	[Define to support the experimental random daemon])
	fi
	AM_CONDITIONAL(USE_RANDOM_DAEMON, test x$use_random_daemon = xyes)


	# Implementation of --disable-asm.
	AC_MSG_CHECKING([whether MPI and cipher assembler modules are requested])
	AC_ARG_ENABLE([asm],
	AS_HELP_STRING([--disable-asm],
	[Disable MPI and cipher assembler modules]),
	[try_asm_modules=$enableval],
	[try_asm_modules=yes])
	AC_MSG_RESULT($try_asm_modules)

	# Implementation of the --enable-m-guard switch.
	AC_MSG_CHECKING([whether memory guard is requested])
	AC_ARG_ENABLE(m-guard,
	AS_HELP_STRING([--enable-m-guard],
	[Enable memory guard facility]),
	[use_m_guard=$enableval], [use_m_guard=no])
	AC_MSG_RESULT($use_m_guard)
	if test "$use_m_guard" = yes ; then
	AC_DEFINE(M_GUARD,1,[Define to use the (obsolete) malloc guarding feature])
	fi

	# Implementation of the --enable-large-data-tests switch.
	AC_MSG_CHECKING([whether to run large data tests])
	AC_ARG_ENABLE(large-data-tests,
	AS_HELP_STRING([--enable-large-data-tests],
	[Enable the real long ruinning large data tests]),
	large_data_tests=$enableval,large_data_tests=no)
	AC_MSG_RESULT($large_data_tests)
	AC_SUBST(RUN_LARGE_DATA_TESTS, $large_data_tests)

	# Implementation of --enable-force-soft-hwfeatures
	AC_MSG_CHECKING([whether 'soft' HW feature bits are forced on])
	AC_ARG_ENABLE([force-soft-hwfeatures],
	AS_HELP_STRING([--enable-force-soft-hwfeatures],
	[Enable forcing 'soft' HW feature bits on]),
	[force_soft_hwfeatures=$enableval],
	[force_soft_hwfeatures=no])
	AC_MSG_RESULT($force_soft_hwfeatures)


	# Implementation of the --with-capabilities switch.
	# Check whether we want to use Linux capabilities
	AC_MSG_CHECKING([whether use of capabilities is requested])
	AC_ARG_WITH(capabilities,
	AS_HELP_STRING([--with-capabilities],
	[Use linux capabilities [default=no]]),
	[use_capabilities="$withval"],[use_capabilities=no])
	AC_MSG_RESULT($use_capabilities)

	# Implementation of the --enable-hmac-binary-check.
	AC_MSG_CHECKING([whether a HMAC binary check is requested])
	AC_ARG_ENABLE(hmac-binary-check,
	AS_HELP_STRING([--enable-hmac-binary-check],
	[Enable library integrity check]),
	[use_hmac_binary_check=$enableval],
	[use_hmac_binary_check=no])
	AC_MSG_RESULT($use_hmac_binary_check)
	if test "$use_hmac_binary_check" = yes ; then
	AC_DEFINE(ENABLE_HMAC_BINARY_CHECK,1,
	[Define to support an HMAC based integrity check])
	fi


	# Implementation of the --disable-jent-support switch.
	AC_MSG_CHECKING([whether jitter entropy support is requested])
	AC_ARG_ENABLE(jent-support,
	AS_HELP_STRING([--disable-jent-support],
	[Disable support for the Jitter entropy collector]),
	jentsupport=$enableval,jentsupport=yes)
	AC_MSG_RESULT($jentsupport)

	# Implementation of the --disable-padlock-support switch.
	AC_MSG_CHECKING([whether padlock support is requested])
	AC_ARG_ENABLE(padlock-support,
	AS_HELP_STRING([--disable-padlock-support],
	[Disable support for the PadLock Engine of VIA processors]),
	padlocksupport=$enableval,padlocksupport=yes)
	AC_MSG_RESULT($padlocksupport)

	# Implementation of the --disable-aesni-support switch.
	AC_MSG_CHECKING([whether AESNI support is requested])
	AC_ARG_ENABLE(aesni-support,
	AS_HELP_STRING([--disable-aesni-support],
	[Disable support for the Intel AES-NI instructions]),
	aesnisupport=$enableval,aesnisupport=yes)
	AC_MSG_RESULT($aesnisupport)

	# Implementation of the --disable-shaext-support switch.
	AC_MSG_CHECKING([whether SHAEXT support is requested])
	AC_ARG_ENABLE(shaext-support,
	AS_HELP_STRING([--disable-shaext-support],
	[Disable support for the Intel SHAEXT instructions]),
	shaextsupport=$enableval,shaextsupport=yes)
	AC_MSG_RESULT($shaextsupport)

	# Implementation of the --disable-pclmul-support switch.
	AC_MSG_CHECKING([whether PCLMUL support is requested])
	AC_ARG_ENABLE(pclmul-support,
	AS_HELP_STRING([--disable-pclmul-support],
	[Disable support for the Intel PCLMUL instructions]),
	pclmulsupport=$enableval,pclmulsupport=yes)
	AC_MSG_RESULT($pclmulsupport)

	# Implementation of the --disable-sse41-support switch.
	AC_MSG_CHECKING([whether SSE4.1 support is requested])
	AC_ARG_ENABLE(sse41-support,
	AS_HELP_STRING([--disable-sse41-support],
	[Disable support for the Intel SSE4.1 instructions]),
	sse41support=$enableval,sse41support=yes)
	AC_MSG_RESULT($sse41support)

	# Implementation of the --disable-drng-support switch.
	AC_MSG_CHECKING([whether DRNG support is requested])
	AC_ARG_ENABLE(drng-support,
	AS_HELP_STRING([--disable-drng-support],
	[Disable support for the Intel DRNG (RDRAND instruction)]),
	drngsupport=$enableval,drngsupport=yes)
	AC_MSG_RESULT($drngsupport)

	# Implementation of the --disable-avx-support switch.
	AC_MSG_CHECKING([whether AVX support is requested])
	AC_ARG_ENABLE(avx-support,
	AS_HELP_STRING([--disable-avx-support],
	[Disable support for the Intel AVX instructions]),
	avxsupport=$enableval,avxsupport=yes)
	AC_MSG_RESULT($avxsupport)

	# Implementation of the --disable-avx2-support switch.
	AC_MSG_CHECKING([whether AVX2 support is requested])
	AC_ARG_ENABLE(avx2-support,
	AS_HELP_STRING([--disable-avx2-support],
	[Disable support for the Intel AVX2 instructions]),
	avx2support=$enableval,avx2support=yes)
	AC_MSG_RESULT($avx2support)

	# Implementation of the --disable-neon-support switch.
	AC_MSG_CHECKING([whether NEON support is requested])
	AC_ARG_ENABLE(neon-support,
	AS_HELP_STRING([--disable-neon-support],
	[Disable support for the ARM NEON instructions]),
	neonsupport=$enableval,neonsupport=yes)
	AC_MSG_RESULT($neonsupport)

	# Implementation of the --disable-arm-crypto-support switch.
	AC_MSG_CHECKING([whether ARMv8 Crypto Extension support is requested])
	AC_ARG_ENABLE(arm-crypto-support,
	AS_HELP_STRING([--disable-arm-crypto-support],
	[Disable support for the ARMv8 Crypto Extension instructions]),
	armcryptosupport=$enableval,armcryptosupport=yes)
	AC_MSG_RESULT($armcryptosupport)

	# Implementation of the --disable-ppc-crypto-support switch.
	AC_MSG_CHECKING([whether PPC crypto support is requested])
	AC_ARG_ENABLE(ppc-crypto-support,
	AS_HELP_STRING([--disable-ppc-crypto-support],
	[Disable support for the PPC crypto instructions introduced in POWER 8 (PowerISA 2.07)]),
	ppccryptosupport=$enableval,ppccryptosupport=yes)
	AC_MSG_RESULT($ppccryptosupport)

	# Implementation of the --disable-O-flag-munging switch.
	AC_MSG_CHECKING([whether a -O flag munging is requested])
	AC_ARG_ENABLE([O-flag-munging],
	AS_HELP_STRING([--disable-O-flag-munging],
	[Disable modification of the cc -O flag]),
	[enable_o_flag_munging=$enableval],
	[enable_o_flag_munging=yes])
	AC_MSG_RESULT($enable_o_flag_munging)
	AM_CONDITIONAL(ENABLE_O_FLAG_MUNGING, test "$enable_o_flag_munging" = "yes")

	# Implementation of the --disable-instrumentation-munging switch.
	AC_MSG_CHECKING([whether a instrumentation (-fprofile, -fsanitize) munging is requested])
	AC_ARG_ENABLE([instrumentation-munging],
	AS_HELP_STRING([--disable-instrumentation-munging],
	[Disable modification of the cc instrumentation options]),
	[enable_instrumentation_munging=$enableval],
	[enable_instrumentation_munging=yes])
	AC_MSG_RESULT($enable_instrumentation_munging)
	AM_CONDITIONAL(ENABLE_INSTRUMENTATION_MUNGING,
	test "$enable_instrumentation_munging" = "yes")

	# Implementation of the --disable-amd64-as-feature-detection switch.
	AC_MSG_CHECKING([whether to enable AMD64 as(1) feature detection])
	AC_ARG_ENABLE(amd64-as-feature-detection,
	AS_HELP_STRING([--disable-amd64-as-feature-detection],
	[Disable the auto-detection of AMD64 as(1) features]),
	amd64_as_feature_detection=$enableval,
	amd64_as_feature_detection=yes)
	AC_MSG_RESULT($amd64_as_feature_detection)


	AC_DEFINE_UNQUOTED(PRINTABLE_OS_NAME, "$PRINTABLE_OS_NAME",
	[A human readable text with the name of the OS])

	# For some systems we know that we have ld_version scripts.
	# Use it then as default.
	have_ld_version_script=no
	case "${host}" in
	--linux*)
	have_ld_version_script=yes
	;;
	--gnu*)
	have_ld_version_script=yes
	;;
	esac
	AC_ARG_ENABLE([ld-version-script],
	AS_HELP_STRING([--enable-ld-version-script],
	[enable/disable use of linker version script.
	(default is system dependent)]),
	[have_ld_version_script=$enableval],
	[ : ] )
	AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")

	AC_DEFINE_UNQUOTED(NAME_OF_DEV_RANDOM, "$NAME_OF_DEV_RANDOM",
	[defined to the name of the strong random device])
	AC_DEFINE_UNQUOTED(NAME_OF_DEV_URANDOM, "$NAME_OF_DEV_URANDOM",
	[defined to the name of the weaker random device])


	###############################
	#### Checks for libraries. ####
	###############################

	#
	# gpg-error is required.
	#
	AM_PATH_GPG_ERROR("$NEED_GPG_ERROR_VERSION")
	if test "x$GPG_ERROR_LIBS" = "x"; then
	AC_MSG_ERROR([libgpg-error is needed.
	See ftp://ftp.gnupg.org/gcrypt/libgpg-error/ .])
	fi

	AC_DEFINE(GPG_ERR_SOURCE_DEFAULT, GPG_ERR_SOURCE_GCRYPT,
	[The default error source for libgcrypt.])

	#
	# Check whether the GNU Pth library is available. We require this
	# to build the optional gcryptrnd program.
	#
	AC_ARG_WITH(pth-prefix,
	AS_HELP_STRING([--with-pth-prefix=PFX],
	[prefix where GNU Pth is installed (optional)]),
	pth_config_prefix="$withval", pth_config_prefix="")
	if test x$pth_config_prefix != x ; then
	PTH_CONFIG="$pth_config_prefix/bin/pth-config"
	fi
	if test "$use_random_daemon" = "yes"; then
	AC_PATH_PROG(PTH_CONFIG, pth-config, no)
	if test "$PTH_CONFIG" = "no"; then
	AC_MSG_WARN([[
	***
	*** To build the Libgcrypt's random number daemon
	*** we need the support of the GNU Portable Threads Library.
	*** Download it from ftp://ftp.gnu.org/gnu/pth/
	*** On a Debian GNU/Linux system you might want to try
	*** apt-get install libpth-dev
	***]])
	else
	GNUPG_PTH_VERSION_CHECK([1.3.7])
	if test $have_pth = yes; then
	PTH_CFLAGS=`$PTH_CONFIG --cflags`
	PTH_LIBS=`$PTH_CONFIG --ldflags`
	PTH_LIBS="$PTH_LIBS `$PTH_CONFIG --libs --all`"
	AC_DEFINE(USE_GNU_PTH, 1,
	[Defined if the GNU Portable Thread Library should be used])
	AC_DEFINE(HAVE_PTH, 1,
	[Defined if the GNU Pth is available])
	fi
	fi
	fi
	AC_SUBST(PTH_CFLAGS)
	AC_SUBST(PTH_LIBS)

	#
	# Check whether pthreads is available
	#
	if test "$have_w32_system" != yes; then
	AC_CHECK_LIB(pthread,pthread_create,have_pthread=yes)
	if test "$have_pthread" = yes; then
	AC_DEFINE(HAVE_PTHREAD, 1 ,[Define if we have pthread.])
	fi
	fi


	# Solaris needs -lsocket and -lnsl. Unisys system includes
	# gethostbyname in libsocket but needs libnsl for socket.
	AC_SEARCH_LIBS(setsockopt, [socket], ,
	[AC_SEARCH_LIBS(setsockopt, [socket], , , [-lnsl])])
	AC_SEARCH_LIBS(setsockopt, [nsl])

	##################################
	#### Checks for header files. ####
	##################################

	AC_HEADER_STDC
	AC_CHECK_HEADERS(unistd.h sys/select.h sys/msg.h sys/auxv.h)
	INSERT_SYS_SELECT_H=
	if test x"$ac_cv_header_sys_select_h" = xyes; then
	INSERT_SYS_SELECT_H=" include <sys/select.h>"
	fi
	AC_SUBST(INSERT_SYS_SELECT_H)


	##########################################
	#### Checks for typedefs, structures, ####
	#### and compiler characteristics. ####
	##########################################

	AC_C_CONST
	AC_C_INLINE
	AC_TYPE_SIZE_T
	AC_TYPE_PID_T

	AC_CHECK_TYPES([byte, ushort, u16, u32, u64])

	gl_TYPE_SOCKLEN_T
	case "${host}" in
	--mingw32*)
	# socklen_t may or may not be defined depending on what headers
	# are included. To be safe we use int as this is the actual type.
	FALLBACK_SOCKLEN_T="typedef int gcry_socklen_t;"
	;;
	*)
	if test ".$gl_cv_socklen_t_equiv" = "."; then
	FALLBACK_SOCKLEN_T="typedef socklen_t gcry_socklen_t;"
	else
	FALLBACK_SOCKLEN_T="typedef ${gl_cv_socklen_t_equiv} gcry_socklen_t;"
	fi
	esac
	AC_SUBST(FALLBACK_SOCKLEN_T)


	#
	# Check for __builtin_bswap32 intrinsic.
	#
	AC_CACHE_CHECK(for __builtin_bswap32,
	[gcry_cv_have_builtin_bswap32],
	[gcry_cv_have_builtin_bswap32=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM([],
	[int x = 0; int y = __builtin_bswap32(x); return y;])],
	[gcry_cv_have_builtin_bswap32=yes])])
	if test "$gcry_cv_have_builtin_bswap32" = "yes" ; then
	AC_DEFINE(HAVE_BUILTIN_BSWAP32,1,
	[Defined if compiler has '__builtin_bswap32' intrinsic])
	fi


	#
	# Check for __builtin_bswap64 intrinsic.
	#
	AC_CACHE_CHECK(for __builtin_bswap64,
	[gcry_cv_have_builtin_bswap64],
	[gcry_cv_have_builtin_bswap64=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM([],
	[long long x = 0; long long y = __builtin_bswap64(x); return y;])],
	[gcry_cv_have_builtin_bswap64=yes])])
	if test "$gcry_cv_have_builtin_bswap64" = "yes" ; then
	AC_DEFINE(HAVE_BUILTIN_BSWAP64,1,
	[Defined if compiler has '__builtin_bswap64' intrinsic])
	fi


	#
	# Check for __builtin_ctz intrinsic.
	#
	AC_CACHE_CHECK(for __builtin_ctz,
	[gcry_cv_have_builtin_ctz],
	[gcry_cv_have_builtin_ctz=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM([],
	[unsigned int x = 0; int y = __builtin_ctz(x); return y;])],
	[gcry_cv_have_builtin_ctz=yes])])
	if test "$gcry_cv_have_builtin_ctz" = "yes" ; then
	AC_DEFINE(HAVE_BUILTIN_CTZ, 1,
	[Defined if compiler has '__builtin_ctz' intrinsic])
	fi


	#
	# Check for __builtin_ctzl intrinsic.
	#
	AC_CACHE_CHECK(for __builtin_ctzl,
	[gcry_cv_have_builtin_ctzl],
	[gcry_cv_have_builtin_ctzl=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM([],
	[unsigned long x = 0; long y = __builtin_ctzl(x); return y;])],
	[gcry_cv_have_builtin_ctzl=yes])])
	if test "$gcry_cv_have_builtin_ctzl" = "yes" ; then
	AC_DEFINE(HAVE_BUILTIN_CTZL, 1,
	[Defined if compiler has '__builtin_ctzl' intrinsic])
	fi


	#
	# Check for __builtin_clz intrinsic.
	#
	AC_CACHE_CHECK(for __builtin_clz,
	[gcry_cv_have_builtin_clz],
	[gcry_cv_have_builtin_clz=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM([],
	[unsigned int x = 0; int y = __builtin_clz(x); return y;])],
	[gcry_cv_have_builtin_clz=yes])])
	if test "$gcry_cv_have_builtin_clz" = "yes" ; then
	AC_DEFINE(HAVE_BUILTIN_CLZ, 1,
	[Defined if compiler has '__builtin_clz' intrinsic])
	fi


	#
	# Check for __builtin_clzl intrinsic.
	#
	AC_CACHE_CHECK(for __builtin_clzl,
	[gcry_cv_have_builtin_clzl],
	[gcry_cv_have_builtin_clzl=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM([],
	[unsigned long x = 0; long y = __builtin_clzl(x); return y;])],
	[gcry_cv_have_builtin_clzl=yes])])
	if test "$gcry_cv_have_builtin_clzl" = "yes" ; then
	AC_DEFINE(HAVE_BUILTIN_CLZL, 1,
	[Defined if compiler has '__builtin_clzl' intrinsic])
	fi


	#
	# Check for __sync_synchronize intrinsic.
	#
	AC_CACHE_CHECK(for __sync_synchronize,
	[gcry_cv_have_sync_synchronize],
	[gcry_cv_have_sync_synchronize=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM([],
	[__sync_synchronize(); return 0;])],
	[gcry_cv_have_sync_synchronize=yes])])
	if test "$gcry_cv_have_sync_synchronize" = "yes" ; then
	AC_DEFINE(HAVE_SYNC_SYNCHRONIZE, 1,
	[Defined if compiler has '__sync_synchronize' intrinsic])
	fi


	#
	# Check for VLA support (variable length arrays).
	#
	AC_CACHE_CHECK(whether the variable length arrays are supported,
	[gcry_cv_have_vla],
	[gcry_cv_have_vla=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[void f1(char *, int);
	char foo(int i) {
	char b[(i < 0 ? 0 : i) + 1];
	f1(b, sizeof b); return b[0];}]])],
	[gcry_cv_have_vla=yes])])
	if test "$gcry_cv_have_vla" = "yes" ; then
	AC_DEFINE(HAVE_VLA,1, [Defined if variable length arrays are supported])
	fi


	#
	# Check for ELF visibility support.
	#
	AC_CACHE_CHECK(whether the visibility attribute is supported,
	gcry_cv_visibility_attribute,
	[gcry_cv_visibility_attribute=no
	AC_LANG_CONFTEST([AC_LANG_SOURCE(
	[[int foo __attribute__ ((visibility ("hidden"))) = 1;
	int bar __attribute__ ((visibility ("protected"))) = 1;
	]])])

	if ${CC-cc} -Werror -S conftest.c -o conftest.s \
	1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
	if grep '\.hidden.*foo' conftest.s >/dev/null 2>&1 ; then
	if grep '\.protected.*bar' conftest.s >/dev/null 2>&1; then
	gcry_cv_visibility_attribute=yes
	fi
	fi
	fi
	])
	if test "$gcry_cv_visibility_attribute" = "yes"; then
	AC_CACHE_CHECK(for broken visibility attribute,
	gcry_cv_broken_visibility_attribute,
	[gcry_cv_broken_visibility_attribute=yes
	AC_LANG_CONFTEST([AC_LANG_SOURCE(
	[[int foo (int x);
	int bar (int x) __asm__ ("foo")
	__attribute__ ((visibility ("hidden")));
	int bar (int x) { return x; }
	]])])

	if ${CC-cc} -Werror -S conftest.c -o conftest.s \
	1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
	if grep '\.hidden@<:@ _@:>@foo' conftest.s >/dev/null 2>&1;
	then
	gcry_cv_broken_visibility_attribute=no
	fi
	fi
	])
	fi
	if test "$gcry_cv_visibility_attribute" = "yes"; then
	AC_CACHE_CHECK(for broken alias attribute,
	gcry_cv_broken_alias_attribute,
	[gcry_cv_broken_alias_attribute=yes
	AC_LANG_CONFTEST([AC_LANG_SOURCE(
	[[extern int foo (int x) __asm ("xyzzy");
	int bar (int x) { return x; }
	extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
	extern int dfoo;
	extern __typeof (dfoo) dfoo __asm ("abccb");
	int dfoo = 1;
	]])])

	if ${CC-cc} -Werror -S conftest.c -o conftest.s \
	1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
	if grep 'xyzzy' conftest.s >/dev/null 2>&1 && \
	grep 'abccb' conftest.s >/dev/null 2>&1; then
	gcry_cv_broken_alias_attribute=no
	fi
	fi
	])
	fi
	if test "$gcry_cv_visibility_attribute" = "yes"; then
	AC_CACHE_CHECK(if gcc supports -fvisibility=hidden,
	gcry_cv_gcc_has_f_visibility,
	[gcry_cv_gcc_has_f_visibility=no
	_gcc_cflags_save=$CFLAGS
	CFLAGS="-fvisibility=hidden"
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
	gcry_cv_gcc_has_f_visibility=yes)
	CFLAGS=$_gcc_cflags_save;
	])
	fi
	if test "$gcry_cv_visibility_attribute" = "yes" \
	&& test "$gcry_cv_broken_visibility_attribute" != "yes" \
	&& test "$gcry_cv_broken_alias_attribute" != "yes" \
	&& test "$gcry_cv_gcc_has_f_visibility" = "yes"
	then
	AC_DEFINE(GCRY_USE_VISIBILITY, 1,
	[Define to use the GNU C visibility attribute.])
	CFLAGS="$CFLAGS -fvisibility=hidden"
	fi


	# Following attribute tests depend on warnings to cause compile to fail,
	# so set -Werror temporarily.
	_gcc_cflags_save=$CFLAGS
	CFLAGS="$CFLAGS -Werror"


	#
	# Check whether the compiler supports the GCC style aligned attribute
	#
	AC_CACHE_CHECK([whether the GCC style aligned attribute is supported],
	[gcry_cv_gcc_attribute_aligned],
	[gcry_cv_gcc_attribute_aligned=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[struct { int a; } foo __attribute__ ((aligned (16)));]])],
	[gcry_cv_gcc_attribute_aligned=yes])])
	if test "$gcry_cv_gcc_attribute_aligned" = "yes" ; then
	AC_DEFINE(HAVE_GCC_ATTRIBUTE_ALIGNED,1,
	[Defined if a GCC style "__attribute__ ((aligned (n))" is supported])
	fi


	#
	# Check whether the compiler supports the GCC style packed attribute
	#
	AC_CACHE_CHECK([whether the GCC style packed attribute is supported],
	[gcry_cv_gcc_attribute_packed],
	[gcry_cv_gcc_attribute_packed=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[struct foolong_s { long b; } __attribute__ ((packed));
	struct foo_s { char a; struct foolong_s b; }
	__attribute__ ((packed));
	enum bar {
	FOO = 1 / (sizeof(struct foo_s) == (sizeof(char) + sizeof(long))),
	};]])],
	[gcry_cv_gcc_attribute_packed=yes])])
	if test "$gcry_cv_gcc_attribute_packed" = "yes" ; then
	AC_DEFINE(HAVE_GCC_ATTRIBUTE_PACKED,1,
	[Defined if a GCC style "__attribute__ ((packed))" is supported])
	fi


	#
	# Check whether the compiler supports the GCC style may_alias attribute
	#
	AC_CACHE_CHECK([whether the GCC style may_alias attribute is supported],
	[gcry_cv_gcc_attribute_may_alias],
	[gcry_cv_gcc_attribute_may_alias=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[typedef struct foo_s { int a; }
	__attribute__ ((may_alias)) foo_t;]])],
	[gcry_cv_gcc_attribute_may_alias=yes])])
	if test "$gcry_cv_gcc_attribute_may_alias" = "yes" ; then
	AC_DEFINE(HAVE_GCC_ATTRIBUTE_MAY_ALIAS,1,
	[Defined if a GCC style "__attribute__ ((may_alias))" is supported])
	fi


	# Restore flags.
	CFLAGS=$_gcc_cflags_save;


	#
	# Check whether the compiler supports 'asm' or '__asm__' keyword for
	# assembler blocks.
	#
	AC_CACHE_CHECK([whether 'asm' assembler keyword is supported],
	[gcry_cv_have_asm],
	[gcry_cv_have_asm=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[void a(void) { asm("":::"memory"); }]])],
	[gcry_cv_have_asm=yes])])
	AC_CACHE_CHECK([whether '__asm__' assembler keyword is supported],
	[gcry_cv_have___asm__],
	[gcry_cv_have___asm__=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[void a(void) { __asm__("":::"memory"); }]])],
	[gcry_cv_have___asm__=yes])])
	if test "$gcry_cv_have_asm" = "no" ; then
	if test "$gcry_cv_have___asm__" = "yes" ; then
	AC_DEFINE(asm,__asm__,
	[Define to supported assembler block keyword, if plain 'asm' was not
	supported])
	fi
	fi


	#
	# Check whether the compiler supports inline assembly memory barrier.
	#
	if test "$gcry_cv_have_asm" = "no" ; then
	if test "$gcry_cv_have___asm__" = "yes" ; then
	AC_CACHE_CHECK([whether inline assembly memory barrier is supported],
	[gcry_cv_have_asm_volatile_memory],
	[gcry_cv_have_asm_volatile_memory=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[void a(int x)
	{
	__asm__ volatile("":::"memory");
	__asm__ volatile("":"+r"(x)::"memory");
	}]])],
	[gcry_cv_have_asm_volatile_memory=yes])])
	fi
	else
	AC_CACHE_CHECK([whether inline assembly memory barrier is supported],
	[gcry_cv_have_asm_volatile_memory],
	[gcry_cv_have_asm_volatile_memory=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[void a(int x)
	{
	asm volatile("":::"memory");
	asm volatile("":"+r"(x)::"memory"); }]])],
	[gcry_cv_have_asm_volatile_memory=yes])])
	fi
	if test "$gcry_cv_have_asm_volatile_memory" = "yes" ; then
	AC_DEFINE(HAVE_GCC_ASM_VOLATILE_MEMORY,1,
	[Define if inline asm memory barrier is supported])
	fi


	#
	# Check whether GCC assembler supports features needed for our ARM
	# implementations. This needs to be done before setting up the
	# assembler stuff.
	#
	AC_CACHE_CHECK([whether GCC assembler is compatible for ARM assembly implementations],
	[gcry_cv_gcc_arm_platform_as_ok],
	[if test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_arm_platform_as_ok="n/a"
	else
	gcry_cv_gcc_arm_platform_as_ok=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(
	/* Test if assembler supports UAL syntax. */
	".syntax unified\n\t"
	".arm\n\t" /* our assembly code is in ARM mode */
	".text\n\t"
	/* Following causes error if assembler ignored '.syntax unified'. */
	"asmfunc:\n\t"
	"add %r0, %r0, %r4, ror #12;\n\t"

	/* Test if '.type' and '.size' are supported. */
	".size asmfunc,.-asmfunc;\n\t"
	".type asmfunc,%function;\n\t"
	);]], [ asmfunc(); ] )],
	[gcry_cv_gcc_arm_platform_as_ok=yes])
	fi])
	if test "$gcry_cv_gcc_arm_platform_as_ok" = "yes" ; then
	AC_DEFINE(HAVE_COMPATIBLE_GCC_ARM_PLATFORM_AS,1,
	[Defined if underlying assembler is compatible with ARM assembly implementations])
	fi


	#
	# Check whether GCC assembler supports features needed for our ARMv8/Aarch64
	# implementations. This needs to be done before setting up the
	# assembler stuff.
	#
	AC_CACHE_CHECK([whether GCC assembler is compatible for ARMv8/Aarch64 assembly implementations],
	[gcry_cv_gcc_aarch64_platform_as_ok],
	[if test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_aarch64_platform_as_ok="n/a"
	else
	gcry_cv_gcc_aarch64_platform_as_ok=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(
	".text\n\t"
	"asmfunc:\n\t"
	"eor x0, x0, x30, ror #12;\n\t"
	"add x0, x0, x30, asr #12;\n\t"
	"eor v0.16b, v0.16b, v31.16b;\n\t"
	);]], [ asmfunc(); ] )],
	[gcry_cv_gcc_aarch64_platform_as_ok=yes])
	fi])
	if test "$gcry_cv_gcc_aarch64_platform_as_ok" = "yes" ; then
	AC_DEFINE(HAVE_COMPATIBLE_GCC_AARCH64_PLATFORM_AS,1,
	[Defined if underlying assembler is compatible with ARMv8/Aarch64 assembly implementations])
	fi

	#
	# Check whether GCC assembler supports for CFI directives.
	#
	AC_CACHE_CHECK([whether GCC assembler supports for CFI directives],
	[gcry_cv_gcc_asm_cfi_directives],
	[gcry_cv_gcc_asm_cfi_directives=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(
	".text\n\t"
	"ac_test:\n\t"
	".cfi_startproc\n\t"
	".cfi_remember_state\n\t"
	".cfi_adjust_cfa_offset 8\n\t"
	".cfi_rel_offset 0, 8\n\t"
	".cfi_def_cfa_register 1\n\t"
	".cfi_register 2, 3\n\t"
	".cfi_restore 2\n\t"
	".cfi_escape 0x0f, 0x02, 0x11, 0x00\n\t"
	".cfi_restore_state\n\t"
	".long 0\n\t"
	".cfi_endproc\n\t"
	);]])],
	[gcry_cv_gcc_asm_cfi_directives=yes])])
	if test "$gcry_cv_gcc_asm_cfi_directives" = "yes" ; then
	AC_DEFINE(HAVE_GCC_ASM_CFI_DIRECTIVES,1,
	[Defined if underlying assembler supports for CFI directives])
	fi


	#
	# Check whether GCC assembler supports for ELF directives.
	#
	AC_CACHE_CHECK([whether GCC assembler supports for ELF directives],
	[gcry_cv_gcc_asm_elf_directives],
	[gcry_cv_gcc_asm_elf_directives=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(
	/* Test if ELF directives '.type' and '.size' are supported. */
	".text\n\t"
	"asmfunc:\n\t"
	".size asmfunc,.-asmfunc;\n\t"
	".type asmfunc,STT_FUNC;\n\t"
	);]])],
	[gcry_cv_gcc_asm_elf_directives=yes])])
	if test "$gcry_cv_gcc_asm_elf_directives" = "yes" ; then
	AC_DEFINE(HAVE_GCC_ASM_ELF_DIRECTIVES,1,
	[Defined if underlying assembler supports for ELF directives])
	fi


	#
	# Check whether underscores in symbols are required. This needs to be
	# done before setting up the assembler stuff.
	#
	GNUPG_SYS_SYMBOL_UNDERSCORE()


	#################################
	#### ####
	#### Setup assembler stuff. ####
	#### Define mpi_cpu_arch. ####
	#### ####
	#################################
	AC_ARG_ENABLE(mpi-path,
	AS_HELP_STRING([--enable-mpi-path=EXTRA_PATH],
	[prepend EXTRA_PATH to list of CPU specific optimizations]),
	mpi_extra_path="$enableval",mpi_extra_path="")
	AC_MSG_CHECKING(architecture and mpi assembler functions)
	if test -f $srcdir/mpi/config.links ; then
	. $srcdir/mpi/config.links
	AC_CONFIG_LINKS("$mpi_ln_list")
	ac_cv_mpi_sflags="$mpi_sflags"
	AC_MSG_RESULT($mpi_cpu_arch)
	else
	AC_MSG_RESULT(failed)
	AC_MSG_ERROR([mpi/config.links missing!])
	fi
	MPI_SFLAGS="$ac_cv_mpi_sflags"
	AC_SUBST(MPI_SFLAGS)

	AM_CONDITIONAL(MPI_MOD_ASM_MPIH_ADD1, test "$mpi_mod_asm_mpih_add1" = yes)
	AM_CONDITIONAL(MPI_MOD_ASM_MPIH_SUB1, test "$mpi_mod_asm_mpih_sub1" = yes)
	AM_CONDITIONAL(MPI_MOD_ASM_MPIH_MUL1, test "$mpi_mod_asm_mpih_mul1" = yes)
	AM_CONDITIONAL(MPI_MOD_ASM_MPIH_MUL2, test "$mpi_mod_asm_mpih_mul2" = yes)
	AM_CONDITIONAL(MPI_MOD_ASM_MPIH_MUL3, test "$mpi_mod_asm_mpih_mul3" = yes)
	AM_CONDITIONAL(MPI_MOD_ASM_MPIH_LSHIFT, test "$mpi_mod_asm_mpih_lshift" = yes)
	AM_CONDITIONAL(MPI_MOD_ASM_MPIH_RSHIFT, test "$mpi_mod_asm_mpih_rshift" = yes)
	AM_CONDITIONAL(MPI_MOD_ASM_UDIV, test "$mpi_mod_asm_udiv" = yes)
	AM_CONDITIONAL(MPI_MOD_ASM_UDIV_QRNND, test "$mpi_mod_asm_udiv_qrnnd" = yes)
	AM_CONDITIONAL(MPI_MOD_C_MPIH_ADD1, test "$mpi_mod_c_mpih_add1" = yes)
	AM_CONDITIONAL(MPI_MOD_C_MPIH_SUB1, test "$mpi_mod_c_mpih_sub1" = yes)
	AM_CONDITIONAL(MPI_MOD_C_MPIH_MUL1, test "$mpi_mod_c_mpih_mul1" = yes)
	AM_CONDITIONAL(MPI_MOD_C_MPIH_MUL2, test "$mpi_mod_c_mpih_mul2" = yes)
	AM_CONDITIONAL(MPI_MOD_C_MPIH_MUL3, test "$mpi_mod_c_mpih_mul3" = yes)
	AM_CONDITIONAL(MPI_MOD_C_MPIH_LSHIFT, test "$mpi_mod_c_mpih_lshift" = yes)
	AM_CONDITIONAL(MPI_MOD_C_MPIH_RSHIFT, test "$mpi_mod_c_mpih_rshift" = yes)
	AM_CONDITIONAL(MPI_MOD_C_UDIV, test "$mpi_mod_c_udiv" = yes)
	AM_CONDITIONAL(MPI_MOD_C_UDIV_QRNND, test "$mpi_mod_c_udiv_qrnnd" = yes)

	# Reset non applicable feature flags.
	if test "$mpi_cpu_arch" != "x86" ; then
	aesnisupport="n/a"
	shaextsupport="n/a"
	pclmulsupport="n/a"
	sse41support="n/a"
	avxsupport="n/a"
	avx2support="n/a"
	padlocksupport="n/a"
	drngsupport="n/a"
	fi

	if test "$mpi_cpu_arch" != "arm" ; then
	if test "$mpi_cpu_arch" != "aarch64" ; then
	neonsupport="n/a"
	armcryptosupport="n/a"
	fi
	fi

	if test "$mpi_cpu_arch" != "ppc"; then
	ppccryptosupport="n/a"
	fi

	#############################################
	#### ####
	#### Platform specific compiler checks. ####
	#### ####
	#############################################


	# Following tests depend on warnings to cause compile to fail, so set -Werror
	# temporarily.
	_gcc_cflags_save=$CFLAGS
	CFLAGS="$CFLAGS -Werror"


	#
	# Check whether compiler supports 'ms_abi' function attribute.
	#
	AC_CACHE_CHECK([whether compiler supports 'ms_abi' function attribute],
	[gcry_cv_gcc_attribute_ms_abi],
	[gcry_cv_gcc_attribute_ms_abi=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[int __attribute__ ((ms_abi)) proto(int);]])],
	[gcry_cv_gcc_attribute_ms_abi=yes])])
	if test "$gcry_cv_gcc_attribute_ms_abi" = "yes" ; then
	AC_DEFINE(HAVE_GCC_ATTRIBUTE_MS_ABI,1,
	[Defined if compiler supports "__attribute__ ((ms_abi))" function attribute])
	fi


	#
	# Check whether compiler supports 'sysv_abi' function attribute.
	#
	AC_CACHE_CHECK([whether compiler supports 'sysv_abi' function attribute],
	[gcry_cv_gcc_attribute_sysv_abi],
	[gcry_cv_gcc_attribute_sysv_abi=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[int __attribute__ ((sysv_abi)) proto(int);]])],
	[gcry_cv_gcc_attribute_sysv_abi=yes])])
	if test "$gcry_cv_gcc_attribute_sysv_abi" = "yes" ; then
	AC_DEFINE(HAVE_GCC_ATTRIBUTE_SYSV_ABI,1,
	[Defined if compiler supports "__attribute__ ((sysv_abi))" function attribute])
	fi


	#
	# Check whether default calling convention is 'ms_abi'.
	#
	if test "$gcry_cv_gcc_attribute_ms_abi" = "yes" ; then
	AC_CACHE_CHECK([whether default calling convention is 'ms_abi'],
	[gcry_cv_gcc_default_abi_is_ms_abi],
	[gcry_cv_gcc_default_abi_is_ms_abi=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[void *test(void) {
	void (def_func)(void) = test;
	void __attribute__((ms_abi))(msabi_func)(void);
	/* warning on SysV abi targets, passes on Windows based targets */
	msabi_func = def_func;
	return msabi_func;
	}]])],
	[gcry_cv_gcc_default_abi_is_ms_abi=yes])])
	if test "$gcry_cv_gcc_default_abi_is_ms_abi" = "yes" ; then
	AC_DEFINE(HAVE_GCC_DEFAULT_ABI_IS_MS_ABI,1,
	[Defined if default calling convention is 'ms_abi'])
	fi
	fi


	#
	# Check whether default calling convention is 'sysv_abi'.
	#
	if test "$gcry_cv_gcc_attribute_sysv_abi" = "yes" ; then
	AC_CACHE_CHECK([whether default calling convention is 'sysv_abi'],
	[gcry_cv_gcc_default_abi_is_sysv_abi],
	[gcry_cv_gcc_default_abi_is_sysv_abi=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[void *test(void) {
	void (def_func)(void) = test;
	void __attribute__((sysv_abi))(sysvabi_func)(void);
	/* warning on MS ABI targets, passes on SysV ABI targets */
	sysvabi_func = def_func;
	return sysvabi_func;
	}]])],
	[gcry_cv_gcc_default_abi_is_sysv_abi=yes])])
	if test "$gcry_cv_gcc_default_abi_is_sysv_abi" = "yes" ; then
	AC_DEFINE(HAVE_GCC_DEFAULT_ABI_IS_SYSV_ABI,1,
	[Defined if default calling convention is 'sysv_abi'])
	fi
	fi


	# Restore flags.
	CFLAGS=$_gcc_cflags_save;


	#
	# Check whether GCC inline assembler supports SSSE3 instructions
	# This is required for the AES-NI instructions.
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports SSSE3 instructions],
	[gcry_cv_gcc_inline_asm_ssse3],
	[if test "$mpi_cpu_arch" != "x86" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_ssse3="n/a"
	else
	gcry_cv_gcc_inline_asm_ssse3=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[static unsigned char be_mask[16] __attribute__ ((aligned (16))) =
	{ 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 };
	void a(void) {
	__asm__("pshufb %[mask], %%xmm2\n\t"::[mask]"m"(*be_mask):);
	}]], [ a(); ] )],
	[gcry_cv_gcc_inline_asm_ssse3=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_ssse3" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_SSSE3,1,
	[Defined if inline assembler supports SSSE3 instructions])
	fi


	#
	# Check whether GCC inline assembler supports PCLMUL instructions.
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports PCLMUL instructions],
	[gcry_cv_gcc_inline_asm_pclmul],
	[if test "$mpi_cpu_arch" != "x86" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_pclmul="n/a"
	else
	gcry_cv_gcc_inline_asm_pclmul=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[void a(void) {
	__asm__("pclmulqdq \$0, %%xmm1, %%xmm3\n\t":::"cc");
	}]], [ a(); ] )],
	[gcry_cv_gcc_inline_asm_pclmul=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_pclmul" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_PCLMUL,1,
	[Defined if inline assembler supports PCLMUL instructions])
	fi


	#
	# Check whether GCC inline assembler supports SHA Extensions instructions.
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports SHA Extensions instructions],
	[gcry_cv_gcc_inline_asm_shaext],
	[if test "$mpi_cpu_arch" != "x86" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_shaext="n/a"
	else
	gcry_cv_gcc_inline_asm_shaext=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[void a(void) {
	__asm__("sha1rnds4 \$0, %%xmm1, %%xmm3\n\t":::"cc");
	__asm__("sha1nexte %%xmm1, %%xmm3\n\t":::"cc");
	__asm__("sha1msg1 %%xmm1, %%xmm3\n\t":::"cc");
	__asm__("sha1msg2 %%xmm1, %%xmm3\n\t":::"cc");
	__asm__("sha256rnds2 %%xmm0, %%xmm1, %%xmm3\n\t":::"cc");
	__asm__("sha256msg1 %%xmm1, %%xmm3\n\t":::"cc");
	__asm__("sha256msg2 %%xmm1, %%xmm3\n\t":::"cc");
	}]], [ a(); ] )],
	[gcry_cv_gcc_inline_asm_shaext=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_shaext" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_SHAEXT,1,
	[Defined if inline assembler supports SHA Extensions instructions])
	fi


	#
	# Check whether GCC inline assembler supports SSE4.1 instructions.
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports SSE4.1 instructions],
	[gcry_cv_gcc_inline_asm_sse41],
	[if test "$mpi_cpu_arch" != "x86" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_sse41="n/a"
	else
	gcry_cv_gcc_inline_asm_sse41=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[void a(void) {
	int i;
	__asm__("pextrd \$2, %%xmm0, %[out]\n\t" : [out] "=m" (i));
	}]], [ a(); ] )],
	[gcry_cv_gcc_inline_asm_sse41=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_sse41" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_SSE41,1,
	[Defined if inline assembler supports SSE4.1 instructions])
	fi


	#
	# Check whether GCC inline assembler supports AVX instructions
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports AVX instructions],
	[gcry_cv_gcc_inline_asm_avx],
	[if test "$mpi_cpu_arch" != "x86" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_avx="n/a"
	else
	gcry_cv_gcc_inline_asm_avx=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[void a(void) {
	__asm__("xgetbv; vaesdeclast (%[mem]),%%xmm0,%%xmm7\n\t"::[mem]"r"(0):);
	}]], [ a(); ] )],
	[gcry_cv_gcc_inline_asm_avx=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_avx" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_AVX,1,
	[Defined if inline assembler supports AVX instructions])
	fi


	#
	# Check whether GCC inline assembler supports AVX2 instructions
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports AVX2 instructions],
	[gcry_cv_gcc_inline_asm_avx2],
	[if test "$mpi_cpu_arch" != "x86" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_avx2="n/a"
	else
	gcry_cv_gcc_inline_asm_avx2=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[void a(void) {
	__asm__("xgetbv; vpbroadcastb %%xmm7,%%ymm1\n\t":::"cc");
	}]], [ a(); ] )],
	[gcry_cv_gcc_inline_asm_avx2=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_avx2" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_AVX2,1,
	[Defined if inline assembler supports AVX2 instructions])
	fi


	#
	# Check whether GCC inline assembler supports VAES and VPCLMUL instructions
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports VAES and VPCLMUL instructions],
	[gcry_cv_gcc_inline_asm_vaes_vpclmul],
	[if test "$mpi_cpu_arch" != "x86" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_vaes_vpclmul="n/a"
	else
	gcry_cv_gcc_inline_asm_vaes_vpclmul=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[void a(void) {
	__asm__("vaesenclast %%ymm7,%%ymm7,%%ymm1\n\t":::"cc");/256-bit/
	__asm__("vaesenclast %%zmm7,%%zmm7,%%zmm1\n\t":::"cc");/512-bit/
	__asm__("vpclmulqdq \$0,%%ymm7,%%ymm7,%%ymm1\n\t":::"cc");/256-bit/
	__asm__("vpclmulqdq \$0,%%zmm7,%%zmm7,%%zmm1\n\t":::"cc");/512-bit/
	}]], [ a(); ] )],
	[gcry_cv_gcc_inline_asm_vaes_vpclmul=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_vaes_vpclmul" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_VAES_VPCLMUL,1,
	[Defined if inline assembler supports VAES and VPCLMUL instructions])
	fi


	#
	# Check whether GCC inline assembler supports BMI2 instructions
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports BMI2 instructions],
	[gcry_cv_gcc_inline_asm_bmi2],
	[if test "$mpi_cpu_arch" != "x86" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_bmi2="n/a"
	else
	gcry_cv_gcc_inline_asm_bmi2=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[unsigned int a(unsigned int x, unsigned int y) {
	unsigned int tmp1, tmp2;
	asm ("rorxl %2, %1, %0"
	: "=r" (tmp1)
	: "rm0" (x), "J" (32 - ((23) & 31)));
	asm ("andnl %2, %1, %0"
	: "=r" (tmp2)
	: "r0" (x), "rm" (y));
	return tmp1 + tmp2;
	}]], [ a(1, 2); ] )],
	[gcry_cv_gcc_inline_asm_bmi2=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_bmi2" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_BMI2,1,
	[Defined if inline assembler supports BMI2 instructions])
	fi


	#
	# Check whether GCC assembler needs "-Wa,--divide" to correctly handle
	# constant division
	#
	if test $amd64_as_feature_detection = yes; then
	AC_CACHE_CHECK([whether GCC assembler handles division correctly],
	[gcry_cv_gcc_as_const_division_ok],
	[gcry_cv_gcc_as_const_division_ok=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(".text\n\tfn:\n\t xorl \$(123456789/12345678), %ebp;\n\t");]],
	[fn();])],
	[gcry_cv_gcc_as_const_division_ok=yes])])
	if test "$gcry_cv_gcc_as_const_division_ok" = "no" ; then
	#
	# Add '-Wa,--divide' to CPPFLAGS and try check again.
	#
	_gcc_cppflags_save="$CPPFLAGS"
	CPPFLAGS="$CPPFLAGS -Wa,--divide"
	AC_CACHE_CHECK([whether GCC assembler handles division correctly with "-Wa,--divide"],
	[gcry_cv_gcc_as_const_division_with_wadivide_ok],
	[gcry_cv_gcc_as_const_division_with_wadivide_ok=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(".text\n\tfn:\n\t xorl \$(123456789/12345678), %ebp;\n\t");]],
	[fn();])],
	[gcry_cv_gcc_as_const_division_with_wadivide_ok=yes])])
	if test "$gcry_cv_gcc_as_const_division_with_wadivide_ok" = "no" ; then
	# '-Wa,--divide' did not work, restore old flags.
	CPPFLAGS="$_gcc_cppflags_save"
	fi
	fi
	fi


	#
	# Check whether GCC assembler supports features needed for our amd64
	# implementations
	#
	if test $amd64_as_feature_detection = yes; then
	AC_CACHE_CHECK([whether GCC assembler is compatible for amd64 assembly implementations],
	[gcry_cv_gcc_amd64_platform_as_ok],
	[if test "$mpi_cpu_arch" != "x86" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_amd64_platform_as_ok="n/a"
	else
	gcry_cv_gcc_amd64_platform_as_ok=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(
	/* Test if '.type' and '.size' are supported. */
	/* These work only on ELF targets. */
	".text\n\t"
	"asmfunc:\n\t"
	".size asmfunc,.-asmfunc;\n\t"
	".type asmfunc,@function;\n\t"
	/* Test if assembler allows use of '/' for constant division
	* (Solaris/x86 issue). If previous constant division check
	* and "-Wa,--divide" workaround failed, this causes assembly
	* to be disable on this machine. */
	"xorl \$(123456789/12345678), %ebp;\n\t"
	);]], [ asmfunc(); ])],
	[gcry_cv_gcc_amd64_platform_as_ok=yes])
	fi])
	if test "$gcry_cv_gcc_amd64_platform_as_ok" = "yes" ; then
	AC_DEFINE(HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS,1,
	[Defined if underlying assembler is compatible with amd64 assembly implementations])
	fi
	if test "$gcry_cv_gcc_amd64_platform_as_ok" = "no" &&
	test "$gcry_cv_gcc_attribute_sysv_abi" = "yes" &&
	test "$gcry_cv_gcc_default_abi_is_ms_abi" = "yes"; then
	AC_CACHE_CHECK([whether GCC assembler is compatible for WIN64 assembly implementations],
	[gcry_cv_gcc_win64_platform_as_ok],
	[gcry_cv_gcc_win64_platform_as_ok=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(
	".text\n\t"
	".globl asmfunc\n\t"
	"asmfunc:\n\t"
	"xorq \$(1234), %rbp;\n\t"
	);]], [ asmfunc(); ])],
	[gcry_cv_gcc_win64_platform_as_ok=yes])])
	if test "$gcry_cv_gcc_win64_platform_as_ok" = "yes" ; then
	AC_DEFINE(HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS,1,
	[Defined if underlying assembler is compatible with WIN64 assembly implementations])
	fi
	fi
	fi


	#
	# Check whether GCC assembler supports features needed for assembly
	# implementations that use Intel syntax
	#
	AC_CACHE_CHECK([whether GCC assembler is compatible for Intel syntax assembly implementations],
	[gcry_cv_gcc_platform_as_ok_for_intel_syntax],
	[if test "$mpi_cpu_arch" != "x86" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_platform_as_ok_for_intel_syntax="n/a"
	else
	gcry_cv_gcc_platform_as_ok_for_intel_syntax=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(
	".intel_syntax noprefix\n\t"
	".text\n\t"
	"actest:\n\t"
	"pxor xmm1, xmm7;\n\t"
	"vperm2i128 ymm2, ymm3, ymm0, 1;\n\t"
	"add eax, ebp;\n\t"
	"rorx eax, ebp, 1;\n\t"
	"sub eax, [esp + 4];\n\t"
	"add dword ptr [esp + eax], 0b10101;\n\t"
	".att_syntax prefix\n\t"
	);]], [ actest(); ])],
	[gcry_cv_gcc_platform_as_ok_for_intel_syntax=yes])
	fi])
	if test "$gcry_cv_gcc_platform_as_ok_for_intel_syntax" = "yes" ; then
	AC_DEFINE(HAVE_INTEL_SYNTAX_PLATFORM_AS,1,
	[Defined if underlying assembler is compatible with Intel syntax assembly implementations])
	fi


	#
	# Check whether compiler is configured for ARMv6 or newer architecture
	#
	AC_CACHE_CHECK([whether compiler is configured for ARMv6 or newer architecture],
	[gcry_cv_cc_arm_arch_is_v6],
	[if test "$mpi_cpu_arch" != "arm" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_cc_arm_arch_is_v6="n/a"
	else
	gcry_cv_cc_arm_arch_is_v6=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[
	#if defined(__arm__) && \
	((defined(__ARM_ARCH) && __ARM_ARCH >= 6) \
	\|\| defined(__ARM_ARCH_6__) \|\| defined(__ARM_ARCH_6J__) \
	\|\| defined(__ARM_ARCH_6Z__) \|\| defined(__ARM_ARCH_6ZK__) \
	\|\| defined(__ARM_ARCH_6K__) \|\| defined(__ARM_ARCH_6T2__) \
	\|\| defined(__ARM_ARCH_7__) \|\| defined(__ARM_ARCH_7A__) \
	\|\| defined(__ARM_ARCH_7R__) \|\| defined(__ARM_ARCH_7M__) \
	\|\| defined(__ARM_ARCH_7EM__))
	/* empty */
	#else
	/* fail compile if not ARMv6. */
	not_armv6 not_armv6 = (not_armv6)not_armv6;
	#endif
	]])],
	[gcry_cv_cc_arm_arch_is_v6=yes])
	fi])
	if test "$gcry_cv_cc_arm_arch_is_v6" = "yes" ; then
	AC_DEFINE(HAVE_ARM_ARCH_V6,1,
	[Defined if ARM architecture is v6 or newer])
	fi


	#
	# Check whether GCC inline assembler supports NEON instructions
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports NEON instructions],
	[gcry_cv_gcc_inline_asm_neon],
	[if test "$mpi_cpu_arch" != "arm" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_neon="n/a"
	else
	gcry_cv_gcc_inline_asm_neon=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(
	".syntax unified\n\t"
	".arm\n\t"
	".fpu neon\n\t"
	".text\n\t"
	"testfn:\n\t"
	"vld1.64 {%q0-%q1}, [%r0]!;\n\t"
	"vrev64.8 %q0, %q3;\n\t"
	"vadd.u64 %q0, %q1;\n\t"
	"vadd.s64 %d3, %d2, %d3;\n\t"
	);
	]], [ testfn(); ])],
	[gcry_cv_gcc_inline_asm_neon=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_neon" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_NEON,1,
	[Defined if inline assembler supports NEON instructions])
	fi


	#
	# Check whether GCC inline assembler supports AArch32 Crypto Extension instructions
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports AArch32 Crypto Extension instructions],
	[gcry_cv_gcc_inline_asm_aarch32_crypto],
	[if test "$mpi_cpu_arch" != "arm" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_aarch32_crypto="n/a"
	else
	gcry_cv_gcc_inline_asm_aarch32_crypto=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(
	".syntax unified\n\t"
	".arch armv8-a\n\t"
	".arm\n\t"
	".fpu crypto-neon-fp-armv8\n\t"
	".text\n\t"

	"testfn:\n\t"
	"sha1h.32 q0, q0;\n\t"
	"sha1c.32 q0, q0, q0;\n\t"
	"sha1p.32 q0, q0, q0;\n\t"
	"sha1su0.32 q0, q0, q0;\n\t"
	"sha1su1.32 q0, q0;\n\t"

	"sha256h.32 q0, q0, q0;\n\t"
	"sha256h2.32 q0, q0, q0;\n\t"
	"sha1p.32 q0, q0, q0;\n\t"
	"sha256su0.32 q0, q0;\n\t"
	"sha256su1.32 q0, q0, q15;\n\t"

	"aese.8 q0, q0;\n\t"
	"aesd.8 q0, q0;\n\t"
	"aesmc.8 q0, q0;\n\t"
	"aesimc.8 q0, q0;\n\t"

	"vmull.p64 q0, d0, d0;\n\t"
	);
	]], [ testfn(); ])],
	[gcry_cv_gcc_inline_asm_aarch32_crypto=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_aarch32_crypto" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_AARCH32_CRYPTO,1,
	[Defined if inline assembler supports AArch32 Crypto Extension instructions])
	fi


	#
	# Check whether GCC inline assembler supports AArch64 NEON instructions
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports AArch64 NEON instructions],
	[gcry_cv_gcc_inline_asm_aarch64_neon],
	[if test "$mpi_cpu_arch" != "aarch64" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_aarch64_neon="n/a"
	else
	gcry_cv_gcc_inline_asm_aarch64_neon=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(
	".cpu generic+simd\n\t"
	".text\n\t"
	"testfn:\n\t"
	"mov w0, \#42;\n\t"
	"dup v0.8b, w0;\n\t"
	"ld4 {v0.8b,v1.8b,v2.8b,v3.8b},[x0],\#32;\n\t"
	);
	]], [ testfn(); ])],
	[gcry_cv_gcc_inline_asm_aarch64_neon=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_aarch64_neon" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_AARCH64_NEON,1,
	[Defined if inline assembler supports AArch64 NEON instructions])
	fi


	#
	# Check whether GCC inline assembler supports AArch64 Crypto Extension instructions
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports AArch64 Crypto Extension instructions],
	[gcry_cv_gcc_inline_asm_aarch64_crypto],
	[if test "$mpi_cpu_arch" != "aarch64" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_aarch64_crypto="n/a"
	else
	gcry_cv_gcc_inline_asm_aarch64_crypto=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(
	".cpu generic+simd+crypto\n\t"
	".text\n\t"
	"testfn:\n\t"
	"mov w0, \#42;\n\t"
	"dup v0.8b, w0;\n\t"
	"ld4 {v0.8b,v1.8b,v2.8b,v3.8b},[x0],\#32;\n\t"

	"sha1h s0, s0;\n\t"
	"sha1c q0, s0, v0.4s;\n\t"
	"sha1p q0, s0, v0.4s;\n\t"
	"sha1su0 v0.4s, v0.4s, v0.4s;\n\t"
	"sha1su1 v0.4s, v0.4s;\n\t"

	"sha256h q0, q0, v0.4s;\n\t"
	"sha256h2 q0, q0, v0.4s;\n\t"
	"sha1p q0, s0, v0.4s;\n\t"
	"sha256su0 v0.4s, v0.4s;\n\t"
	"sha256su1 v0.4s, v0.4s, v31.4s;\n\t"

	"aese v0.16b, v0.16b;\n\t"
	"aesd v0.16b, v0.16b;\n\t"
	"aesmc v0.16b, v0.16b;\n\t"
	"aesimc v0.16b, v0.16b;\n\t"

	"pmull v0.1q, v0.1d, v31.1d;\n\t"
	"pmull2 v0.1q, v0.2d, v31.2d;\n\t"
	);
	]], [ testfn(); ])],
	[gcry_cv_gcc_inline_asm_aarch64_crypto=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_aarch64_crypto" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_AARCH64_CRYPTO,1,
	[Defined if inline assembler supports AArch64 Crypto Extension instructions])
	fi


	#
	# Check whether PowerPC AltiVec/VSX intrinsics
	#
	AC_CACHE_CHECK([whether compiler supports PowerPC AltiVec/VSX intrinsics],
	[gcry_cv_cc_ppc_altivec],
	[if test "$mpi_cpu_arch" != "ppc" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_cc_ppc_altivec="n/a"
	else
	gcry_cv_cc_ppc_altivec=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[#include <altivec.h>
	typedef vector unsigned char block;
	typedef vector unsigned int vecu32;
	block fn(block in)
	{
	block t = vec_perm (in, in, vec_vsx_ld (0, (unsigned char*)0));
	vecu32 y = vec_vsx_ld (0, (unsigned int*)0);
	return vec_cipher_be (t, in) ^ (block)y;
	}
	]])],
	[gcry_cv_cc_ppc_altivec=yes])
	fi])
	if test "$gcry_cv_cc_ppc_altivec" = "yes" ; then
	AC_DEFINE(HAVE_COMPATIBLE_CC_PPC_ALTIVEC,1,
	[Defined if underlying compiler supports PowerPC AltiVec/VSX/crypto intrinsics])
	fi

	_gcc_cflags_save=$CFLAGS
	CFLAGS="$CFLAGS -maltivec -mvsx -mcrypto"

	if test "$gcry_cv_cc_ppc_altivec" = "no" &&
	test "$mpi_cpu_arch" = "ppc" &&
	test "$try_asm_modules" == "yes" ; then
	AC_CACHE_CHECK([whether compiler supports PowerPC AltiVec/VSX/crypto intrinsics with extra GCC flags],
	[gcry_cv_cc_ppc_altivec_cflags],
	[gcry_cv_cc_ppc_altivec_cflags=no
	AC_COMPILE_IFELSE([AC_LANG_SOURCE(
	[[#include <altivec.h>
	typedef vector unsigned char block;
	typedef vector unsigned int vecu32;
	block fn(block in)
	{
	block t = vec_perm (in, in, vec_vsx_ld (0, (unsigned char*)0));
	vecu32 y = vec_vsx_ld (0, (unsigned int*)0);
	return vec_cipher_be (t, in) ^ (block)y;
	}]])],
	[gcry_cv_cc_ppc_altivec_cflags=yes])])
	if test "$gcry_cv_cc_ppc_altivec_cflags" = "yes" ; then
	AC_DEFINE(HAVE_COMPATIBLE_CC_PPC_ALTIVEC,1,
	[Defined if underlying compiler supports PowerPC AltiVec/VSX/crypto intrinsics])
	AC_DEFINE(HAVE_COMPATIBLE_CC_PPC_ALTIVEC_WITH_CFLAGS,1,
	[Defined if underlying compiler supports PowerPC AltiVec/VSX/crypto intrinsics with extra GCC flags])
	fi
	fi

	AM_CONDITIONAL(ENABLE_PPC_VCRYPTO_EXTRA_CFLAGS,
	test "$gcry_cv_cc_ppc_altivec_cflags" = "yes")

	# Restore flags.
	CFLAGS=$_gcc_cflags_save;


	#
	# Check whether GCC inline assembler supports PowerPC AltiVec/VSX/crypto instructions
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports PowerPC AltiVec/VSX/crypto instructions],
	[gcry_cv_gcc_inline_asm_ppc_altivec],
	[if test "$mpi_cpu_arch" != "ppc" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_ppc_altivec="n/a"
	else
	gcry_cv_gcc_inline_asm_ppc_altivec=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(".globl testfn;\n"
	".text\n\t"
	"testfn:\n"
	"stvx %v31,%r12,%r0;\n"
	"lvx %v20,%r12,%r0;\n"
	"vcipher %v0, %v1, %v22;\n"
	"lxvw4x %vs32, %r0, %r1;\n"
	"vadduwm %v0, %v1, %v22;\n"
	"vshasigmaw %v0, %v1, 0, 15;\n"
	"vshasigmad %v0, %v1, 0, 15;\n"
	"vpmsumd %v11, %v11, %v11;\n"
	);
	]], [ testfn(); ] )],
	[gcry_cv_gcc_inline_asm_ppc_altivec=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_ppc_altivec" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_PPC_ALTIVEC,1,
	[Defined if inline assembler supports PowerPC AltiVec/VSX/crypto instructions])
	fi


	#
	# Check whether GCC inline assembler supports PowerISA 3.00 instructions
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports PowerISA 3.00 instructions],
	[gcry_cv_gcc_inline_asm_ppc_arch_3_00],
	[if test "$mpi_cpu_arch" != "ppc" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_ppc_arch_3_00="n/a"
	else
	gcry_cv_gcc_inline_asm_ppc_arch_3_00=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[__asm__(".text\n\t"
	".globl testfn;\n"
	"testfn:\n"
	"stxvb16x %r1,%v12,%v30;\n"
	);
	]], [ testfn(); ])],
	[gcry_cv_gcc_inline_asm_ppc_arch_3_00=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_ppc_arch_3_00" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_PPC_ARCH_3_00,1,
	[Defined if inline assembler supports PowerISA 3.00 instructions])
	fi


	#
	# Check whether GCC inline assembler supports zSeries instructions
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports zSeries instructions],
	[gcry_cv_gcc_inline_asm_s390x],
	[if test "$mpi_cpu_arch" != "s390x" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_s390x="n/a"
	else
	gcry_cv_gcc_inline_asm_s390x=no
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[typedef unsigned int u128_t __attribute__ ((mode (TI)));
	unsigned int testfunc(unsigned int x, void *y, unsigned int z)
	{
	unsigned long fac[8];
	register unsigned long reg0 asm("0") = 0;
	register unsigned long reg1 asm("1") = x;
	u128_t r1 = ((u128_t)(unsigned long)y << 64) \| (unsigned long)z;
	u128_t r2 = 0;
	u128_t r3 = 0;
	asm volatile (".insn rre,0xb92e << 16, %[r1], %[r2]\n\t"
	: [r1] "+a" (r1), [r2] "+a" (r2)
	: "r" (reg0), "r" (reg1)
	: "cc", "memory");
	asm volatile (".insn rrf,0xb929 << 16, %[r1], %[r2], %[r3], 0\n\t"
	: [r1] "+a" (r1), [r2] "+a" (r2), [r3] "+a" (r3)
	: "r" (reg0), "r" (reg1)
	: "cc", "memory");
	reg0 = 8 - 1;
	asm ("stfle %1\n\t"
	: "+d" (reg0), "=Q" (fac[0])
	:
	: "cc", "memory");
	asm volatile ("mvc 0(16, %0), 0(%1)\n\t"
	:
	: "a" (y), "a" (fac)
	: "memory");
	asm volatile ("xc 0(16, %0), 0(%0)\n\t"
	:
	: "a" (fac)
	: "memory");
	asm volatile ("risbgn %%r11, %%r11, 0, 129, 0\n\t"
	:
	:
	: "memory", "r11");
	asm volatile ("algrk %%r14, %%r14, %%r14\n\t"
	:
	:
	: "memory", "r14");
	return (unsigned int)r1 ^ reg0;
	}
	]] , [ testfunc(0, 0, 0); ])],
	[gcry_cv_gcc_inline_asm_s390x=yes])
	fi])
	if test "$gcry_cv_gcc_inline_asm_s390x" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_S390X,1,
	[Defined if inline assembler supports zSeries instructions])
	fi


	#
	# Check whether GCC inline assembler supports zSeries vector instructions
	#
	AC_CACHE_CHECK([whether GCC inline assembler supports zSeries vector instructions],
	[gcry_cv_gcc_inline_asm_s390x_vx],
	[if test "$mpi_cpu_arch" != "s390x" \|\|
	test "$try_asm_modules" != "yes" ; then
	gcry_cv_gcc_inline_asm_s390x_vx="n/a"
	else
	gcry_cv_gcc_inline_asm_s390x_vx=no
	if test "$gcry_cv_gcc_inline_asm_s390x" = "yes" ; then
	AC_LINK_IFELSE([AC_LANG_PROGRAM(
	[[void testfunc(void)
	{
	asm volatile (".machine \"z13+vx\"\n\t"
	"vx %%v0, %%v1, %%v31\n\t"
	"verllf %%v11, %%v11, (16)(0)\n\t"
	:
	:
	: "memory");
	}
	]], [ testfunc(); ])],
	[gcry_cv_gcc_inline_asm_s390x_vx=yes])
	fi
	fi])
	if test "$gcry_cv_gcc_inline_asm_s390x_vx" = "yes" ; then
	AC_DEFINE(HAVE_GCC_INLINE_ASM_S390X_VX,1,
	[Defined if inline assembler supports zSeries vector instructions])
	fi


	#######################################
	#### Checks for library functions. ####
	#######################################

	AC_FUNC_VPRINTF
	# We have replacements for these in src/missing-string.c
	AC_CHECK_FUNCS(stpcpy strcasecmp)
	# We have replacements for these in src/g10lib.h
	AC_CHECK_FUNCS(strtoul memmove stricmp atexit raise)
	# Other checks
	AC_CHECK_FUNCS(strerror rand mmap getpagesize sysconf waitpid wait4)
	AC_CHECK_FUNCS(gettimeofday getrusage gethrtime clock_gettime syslog)
	AC_CHECK_FUNCS(syscall fcntl ftruncate flockfile getauxval elf_aux_info)
	AC_CHECK_FUNCS(explicit_bzero explicit_memset getentropy)

	GNUPG_CHECK_MLOCK

	#
	# Replacement functions.
	#
	AC_REPLACE_FUNCS([getpid clock])


	#
	# Check whether it is necessary to link against libdl.
	#
	DL_LIBS=""
	if test "$use_hmac_binary_check" = yes ; then
	_gcry_save_libs="$LIBS"
	LIBS=""
	AC_SEARCH_LIBS(dlopen, c dl,,,)
	DL_LIBS=$LIBS
	LIBS="$_gcry_save_libs"
	fi
	AC_SUBST(DL_LIBS)


	#
	# Check whether we can use Linux capabilities as requested.
	#
	if test "$use_capabilities" = "yes" ; then
	use_capabilities=no
	AC_CHECK_HEADERS(sys/capability.h)
	if test "$ac_cv_header_sys_capability_h" = "yes" ; then
	AC_CHECK_LIB(cap, cap_init, ac_need_libcap=1)
	if test "$ac_cv_lib_cap_cap_init" = "yes"; then
	AC_DEFINE(USE_CAPABILITIES,1,
	[define if capabilities should be used])
	LIBS="$LIBS -lcap"
	use_capabilities=yes
	fi
	fi
	if test "$use_capabilities" = "no" ; then
	AC_MSG_WARN([[
	***
	*** The use of capabilities on this system is not possible.
	*** You need a recent Linux kernel and some patches:
	*** fcaps-2.2.9-990610.patch (kernel patch for 2.2.9)
	*** fcap-module-990613.tar.gz (kernel module)
	*** libcap-1.92.tar.gz (user mode library and utilities)
	*** And you have to configure the kernel with CONFIG_VFS_CAP_PLUGIN
	*** set (filesystems menu). Be warned: This code is really ALPHA.
	***]])
	fi
	fi

	# Check whether a random device is available.
	if test "$try_dev_random" = yes ; then
	AC_CACHE_CHECK(for random device, ac_cv_have_dev_random,
	[if test -r "$NAME_OF_DEV_RANDOM" && test -r "$NAME_OF_DEV_URANDOM" ; then
	ac_cv_have_dev_random=yes; else ac_cv_have_dev_random=no; fi])
	if test "$ac_cv_have_dev_random" = yes; then
	AC_DEFINE(HAVE_DEV_RANDOM,1,
	[defined if the system supports a random device] )
	fi
	else
	AC_MSG_CHECKING(for random device)
	ac_cv_have_dev_random=no
	AC_MSG_RESULT(has been disabled)
	fi

	# Figure out the random modules for this configuration.
	if test "$random" = "default"; then

	# Select default value.
	if test "$ac_cv_have_dev_random" = yes; then
	# Try Linuxish random device.
	random_modules="linux"
	else
	case "${host}" in
	--mingw32ce*)
	# WindowsCE random device.
	random_modules="w32ce"
	;;
	--mingw32\|--cygwin)
	# Windows random device.
	random_modules="w32"
	;;
	*)
	# Build everything, allow to select at runtime.
	random_modules="$auto_random_modules"
	;;
	esac
	fi
	else
	if test "$random" = "auto"; then
	# Build everything, allow to select at runtime.
	random_modules="$auto_random_modules"
	else
	random_modules="$random"
	fi
	fi


	#
	# Other defines
	#
	if test mym4_isgit = "yes"; then
	AC_DEFINE(IS_DEVELOPMENT_VERSION,1,
	[Defined if this is not a regular release])
	fi


	AM_CONDITIONAL(CROSS_COMPILING, test x$cross_compiling = xyes)


	# This is handy for debugging so the compiler doesn't rearrange
	# things and eliminate variables.
	AC_ARG_ENABLE(optimization,
	AS_HELP_STRING([--disable-optimization],
	[disable compiler optimization]),
	[if test $enableval = no ; then
	CFLAGS=`echo $CFLAGS \| sed 's/-O[[0-9]]//'`
	fi])

	AC_MSG_NOTICE([checking for cc features])
	# CFLAGS mangling when using gcc.
	if test "$GCC" = yes; then
	AC_MSG_CHECKING([if gcc supports -fno-delete-null-pointer-checks])
	_gcc_cflags_save=$CFLAGS
	CFLAGS="-fno-delete-null-pointer-checks"
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],_gcc_wopt=yes,_gcc_wopt=no)
	AC_MSG_RESULT($_gcc_wopt)
	CFLAGS=$_gcc_cflags_save;
	if test x"$_gcc_wopt" = xyes ; then
	CFLAGS="$CFLAGS -fno-delete-null-pointer-checks"
	fi

	CFLAGS="$CFLAGS -Wall"
	if test "$USE_MAINTAINER_MODE" = "yes"; then
	CFLAGS="$CFLAGS -Wcast-align -Wshadow -Wstrict-prototypes"
	CFLAGS="$CFLAGS -Wformat -Wno-format-y2k -Wformat-security"

	# If -Wno-missing-field-initializers is supported we can enable a
	# a bunch of really useful warnings.
	AC_MSG_CHECKING([if gcc supports -Wno-missing-field-initializers])
	_gcc_cflags_save=$CFLAGS
	CFLAGS="-Wno-missing-field-initializers"
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],_gcc_wopt=yes,_gcc_wopt=no)
	AC_MSG_RESULT($_gcc_wopt)
	CFLAGS=$_gcc_cflags_save;
	if test x"$_gcc_wopt" = xyes ; then
	CFLAGS="$CFLAGS -W -Wextra -Wbad-function-cast"
	CFLAGS="$CFLAGS -Wwrite-strings"
	CFLAGS="$CFLAGS -Wdeclaration-after-statement"
	CFLAGS="$CFLAGS -Wno-missing-field-initializers"
	CFLAGS="$CFLAGS -Wno-sign-compare"
	fi

	AC_MSG_CHECKING([if gcc supports -Wpointer-arith])
	_gcc_cflags_save=$CFLAGS
	CFLAGS="-Wpointer-arith"
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],_gcc_wopt=yes,_gcc_wopt=no)
	AC_MSG_RESULT($_gcc_wopt)
	CFLAGS=$_gcc_cflags_save;
	if test x"$_gcc_wopt" = xyes ; then
	CFLAGS="$CFLAGS -Wpointer-arith"
	fi
	fi
	fi

	# Check whether as(1) supports a noeexecstack feature. This test
	# includes an override option.
	CL_AS_NOEXECSTACK


	AC_SUBST(LIBGCRYPT_CONFIG_API_VERSION)
	AC_SUBST(LIBGCRYPT_CONFIG_LIBS)
	AC_SUBST(LIBGCRYPT_CONFIG_CFLAGS)
	AC_SUBST(LIBGCRYPT_CONFIG_HOST)
	AC_SUBST(LIBGCRYPT_THREAD_MODULES)

	AC_CONFIG_COMMANDS([gcrypt-conf],[[
	chmod +x src/libgcrypt-config
	]],[[
	prefix=$prefix
	exec_prefix=$exec_prefix
	libdir=$libdir
	datadir=$datadir
	DATADIRNAME=$DATADIRNAME
	]])

	#####################
	#### Conclusion. ####
	#####################

	# Check that requested feature can actually be used and define
	# ENABLE_foo_SUPPORT macros.

	if test x"$aesnisupport" = xyes ; then
	if test "$gcry_cv_gcc_inline_asm_ssse3" != "yes" ; then
	aesnisupport="no (unsupported by compiler)"
	fi
	fi
	if test x"$shaextsupport" = xyes ; then
	if test "$gcry_cv_gcc_inline_asm_shaext" != "yes" ; then
	shaextsupport="no (unsupported by compiler)"
	fi
	fi
	if test x"$pclmulsupport" = xyes ; then
	if test "$gcry_cv_gcc_inline_asm_pclmul" != "yes" ; then
	pclmulsupport="no (unsupported by compiler)"
	fi
	fi
	if test x"$sse41support" = xyes ; then
	if test "$gcry_cv_gcc_inline_asm_sse41" != "yes" ; then
	sse41support="no (unsupported by compiler)"
	fi
	fi
	if test x"$avxsupport" = xyes ; then
	if test "$gcry_cv_gcc_inline_asm_avx" != "yes" ; then
	avxsupport="no (unsupported by compiler)"
	fi
	fi
	if test x"$avx2support" = xyes ; then
	if test "$gcry_cv_gcc_inline_asm_avx2" != "yes" ; then
	avx2support="no (unsupported by compiler)"
	fi
	fi
	if test x"$neonsupport" = xyes ; then
	if test "$gcry_cv_gcc_inline_asm_neon" != "yes" ; then
	if test "$gcry_cv_gcc_inline_asm_aarch64_neon" != "yes" ; then
	neonsupport="no (unsupported by compiler)"
	fi
	fi
	fi
	if test x"$armcryptosupport" = xyes ; then
	if test "$gcry_cv_gcc_inline_asm_aarch32_crypto" != "yes" ; then
	if test "$gcry_cv_gcc_inline_asm_aarch64_crypto" != "yes" ; then
	neonsupport="no (unsupported by compiler)"
	fi
	fi
	fi

	if test x"$aesnisupport" = xyes ; then
	AC_DEFINE(ENABLE_AESNI_SUPPORT, 1,
	[Enable support for Intel AES-NI instructions.])
	fi
	if test x"$shaextsupport" = xyes ; then
	AC_DEFINE(ENABLE_SHAEXT_SUPPORT, 1,
	[Enable support for Intel SHAEXT instructions.])
	fi
	if test x"$pclmulsupport" = xyes ; then
	AC_DEFINE(ENABLE_PCLMUL_SUPPORT, 1,
	[Enable support for Intel PCLMUL instructions.])
	fi
	if test x"$sse41support" = xyes ; then
	AC_DEFINE(ENABLE_SSE41_SUPPORT, 1,
	[Enable support for Intel SSE4.1 instructions.])
	fi
	if test x"$avxsupport" = xyes ; then
	AC_DEFINE(ENABLE_AVX_SUPPORT,1,
	[Enable support for Intel AVX instructions.])
	fi
	if test x"$avx2support" = xyes ; then
	AC_DEFINE(ENABLE_AVX2_SUPPORT,1,
	[Enable support for Intel AVX2 instructions.])
	fi
	if test x"$neonsupport" = xyes ; then
	AC_DEFINE(ENABLE_NEON_SUPPORT,1,
	[Enable support for ARM NEON instructions.])
	fi
	if test x"$armcryptosupport" = xyes ; then
	AC_DEFINE(ENABLE_ARM_CRYPTO_SUPPORT,1,
	[Enable support for ARMv8 Crypto Extension instructions.])
	fi
	if test x"$ppccryptosupport" = xyes ; then
	AC_DEFINE(ENABLE_PPC_CRYPTO_SUPPORT,1,
	[Enable support for POWER 8 (PowerISA 2.07) crypto extension.])
	fi
	if test x"$jentsupport" = xyes ; then
	AC_DEFINE(ENABLE_JENT_SUPPORT, 1,
	[Enable support for the jitter entropy collector.])
	fi
	if test x"$padlocksupport" = xyes ; then
	AC_DEFINE(ENABLE_PADLOCK_SUPPORT, 1,
	[Enable support for the PadLock engine.])
	fi
	if test x"$drngsupport" = xyes ; then
	AC_DEFINE(ENABLE_DRNG_SUPPORT, 1,
	[Enable support for Intel DRNG (RDRAND instruction).])
	fi


	if test x"$force_soft_hwfeatures" = xyes ; then
	AC_DEFINE(ENABLE_FORCE_SOFT_HWFEATURES, 1,
	[Enable forcing 'soft' HW feature bits on (for testing).])
	fi

	# Define conditional sources and config.h symbols depending on the
	# selected ciphers, pubkey-ciphers, digests, kdfs, and random modules.

	LIST_MEMBER(arcfour, $enabled_ciphers)
	if test "$found" = "1"; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS arcfour.lo"
	AC_DEFINE(USE_ARCFOUR, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS arcfour-amd64.lo"
	;;
	esac
	fi

	LIST_MEMBER(blowfish, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS blowfish.lo"
	AC_DEFINE(USE_BLOWFISH, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS blowfish-amd64.lo"
	;;
	arm--*)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS blowfish-arm.lo"
	;;
	esac
	fi

	LIST_MEMBER(cast5, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS cast5.lo"
	AC_DEFINE(USE_CAST5, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS cast5-amd64.lo"
	;;
	arm--*)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS cast5-arm.lo"
	;;
	esac
	fi

	LIST_MEMBER(des, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS des.lo"
	AC_DEFINE(USE_DES, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS des-amd64.lo"
	;;
	esac
	fi

	LIST_MEMBER(aes, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael.lo"
	AC_DEFINE(USE_AES, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-amd64.lo"

	# Build with the SSSE3 implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-ssse3-amd64.lo"
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-ssse3-amd64-asm.lo"

	# Build with the VAES/AVX2 implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-vaes.lo"
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-vaes-avx2-amd64.lo"
	;;
	arm--*)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-arm.lo"

	# Build with the ARMv8/AArch32 CE implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-armv8-ce.lo"
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-armv8-aarch32-ce.lo"
	;;
	aarch64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-aarch64.lo"

	# Build with the ARMv8/AArch64 CE implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-armv8-ce.lo"
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-armv8-aarch64-ce.lo"
	;;
	powerpc64le--)
	# Build with the crypto extension implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-ppc.lo"
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-ppc9le.lo"
	;;
	powerpc64--)
	# Big-Endian.
	# Build with the crypto extension implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-ppc.lo"
	;;
	powerpc--)
	# Big-Endian.
	# Build with the crypto extension implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-ppc.lo"
	;;
	s390x--)
	# Big-Endian.
	# Build with the crypto extension implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-s390x.lo"
	;;
	esac

	case "$mpi_cpu_arch" in
	x86)
	# Build with the AES-NI implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-aesni.lo"

	# Build with the Padlock implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rijndael-padlock.lo"
	;;
	esac
	fi

	LIST_MEMBER(twofish, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS twofish.lo"
	AC_DEFINE(USE_TWOFISH, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS twofish-amd64.lo"

	if test x"$avx2support" = xyes ; then
	# Build with the AVX2 implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS twofish-avx2-amd64.lo"
	fi
	;;
	arm--*)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS twofish-arm.lo"
	;;
	aarch64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS twofish-aarch64.lo"
	;;
	esac
	fi

	LIST_MEMBER(serpent, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS serpent.lo"
	AC_DEFINE(USE_SERPENT, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the SSE2 implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS serpent-sse2-amd64.lo"
	;;
	esac

	if test x"$avx2support" = xyes ; then
	# Build with the AVX2 implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS serpent-avx2-amd64.lo"
	fi

	if test x"$neonsupport" = xyes ; then
	# Build with the NEON implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS serpent-armv7-neon.lo"
	fi
	fi

	LIST_MEMBER(rfc2268, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS rfc2268.lo"
	AC_DEFINE(USE_RFC2268, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(seed, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS seed.lo"
	AC_DEFINE(USE_SEED, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(camellia, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS camellia.lo camellia-glue.lo"
	AC_DEFINE(USE_CAMELLIA, 1, [Defined if this module should be included])

	case "${host}" in
	arm--*)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS camellia-arm.lo"
	;;
	aarch64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS camellia-aarch64.lo"
	;;
	esac

	if test x"$avxsupport" = xyes ; then
	if test x"$aesnisupport" = xyes ; then
	# Build with the AES-NI/AVX implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS camellia-aesni-avx-amd64.lo"
	fi
	fi

	if test x"$avx2support" = xyes ; then
	if test x"$aesnisupport" = xyes ; then
	# Build with the AES-NI/AVX2 implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS camellia-aesni-avx2-amd64.lo"

	# Build with the VAES/AVX2 implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS camellia-vaes-avx2-amd64.lo"
	fi
	fi
	fi

	LIST_MEMBER(idea, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS idea.lo"
	AC_DEFINE(USE_IDEA, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(salsa20, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS salsa20.lo"
	AC_DEFINE(USE_SALSA20, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS salsa20-amd64.lo"
	;;
	esac

	if test x"$neonsupport" = xyes ; then
	# Build with the NEON implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS salsa20-armv7-neon.lo"
	fi
	fi

	LIST_MEMBER(gost28147, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS gost28147.lo"
	AC_DEFINE(USE_GOST28147, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(chacha20, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS chacha20.lo"
	AC_DEFINE(USE_CHACHA20, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS chacha20-amd64-ssse3.lo"
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS chacha20-amd64-avx2.lo"
	;;
	aarch64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS chacha20-aarch64.lo"
	;;
	powerpc64le--)
	# Build with the ppc8 vector implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS chacha20-ppc.lo"
	;;
	powerpc64--)
	# Build with the ppc8 vector implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS chacha20-ppc.lo"
	;;
	powerpc--)
	# Build with the ppc8 vector implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS chacha20-ppc.lo"
	;;
	s390x--)
	# Build with the s390x/zSeries vector implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS chacha20-s390x.lo"
	;;
	esac

	if test x"$neonsupport" = xyes ; then
	# Build with the NEON implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS chacha20-armv7-neon.lo"
	fi
	fi

	LIST_MEMBER(sm4, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS sm4.lo"
	AC_DEFINE(USE_SM4, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS sm4-aesni-avx-amd64.lo"
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS sm4-aesni-avx2-amd64.lo"
	;;
	esac
	fi

	LIST_MEMBER(dsa, $enabled_pubkey_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_PUBKEY_CIPHERS="$GCRYPT_PUBKEY_CIPHERS dsa.lo"
	AC_DEFINE(USE_DSA, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(rsa, $enabled_pubkey_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_PUBKEY_CIPHERS="$GCRYPT_PUBKEY_CIPHERS rsa.lo"
	AC_DEFINE(USE_RSA, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(elgamal, $enabled_pubkey_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_PUBKEY_CIPHERS="$GCRYPT_PUBKEY_CIPHERS elgamal.lo"
	AC_DEFINE(USE_ELGAMAL, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(ecc, $enabled_pubkey_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_PUBKEY_CIPHERS="$GCRYPT_PUBKEY_CIPHERS \
	ecc.lo ecc-curves.lo ecc-misc.lo \
	ecc-ecdh.lo ecc-ecdsa.lo ecc-eddsa.lo ecc-gost.lo \
	ecc-sm2.lo"
	AC_DEFINE(USE_ECC, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(crc, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS crc.lo"
	AC_DEFINE(USE_CRC, 1, [Defined if this module should be included])

	case "${host}" in
	i?86-- \| x86_64--)
	# Build with the assembly implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS crc-intel-pclmul.lo"
	;;
	aarch64--)
	# Build with the assembly implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS crc-armv8-ce.lo"
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS crc-armv8-aarch64-ce.lo"
	;;
	powerpc64le--)
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS crc-ppc.lo"
	;;
	powerpc64--)
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS crc-ppc.lo"
	;;
	powerpc--)
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS crc-ppc.lo"
	;;
	esac
	fi

	LIST_MEMBER(gostr3411-94, $enabled_digests)
	if test "$found" = "1" ; then
	# GOST R 34.11-94 internally uses GOST 28147-89
	LIST_MEMBER(gost28147, $enabled_ciphers)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS gostr3411-94.lo"
	AC_DEFINE(USE_GOST_R_3411_94, 1, [Defined if this module should be included])
	fi
	fi

	LIST_MEMBER(stribog, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS stribog.lo"
	AC_DEFINE(USE_GOST_R_3411_12, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(md2, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS md2.lo"
	AC_DEFINE(USE_MD2, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(md4, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS md4.lo"
	AC_DEFINE(USE_MD4, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(md5, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS md5.lo"
	AC_DEFINE(USE_MD5, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(rmd160, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS rmd160.lo"
	AC_DEFINE(USE_RMD160, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(sha256, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha256.lo"
	AC_DEFINE(USE_SHA256, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha256-ssse3-amd64.lo"
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha256-avx-amd64.lo"
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha256-avx2-bmi2-amd64.lo"
	;;
	arm--*)
	# Build with the assembly implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha256-armv8-aarch32-ce.lo"
	;;
	aarch64--)
	# Build with the assembly implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha256-armv8-aarch64-ce.lo"
	;;
	powerpc64le--)
	# Build with the crypto extension implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS sha256-ppc.lo"
	;;
	powerpc64--)
	# Big-Endian.
	# Build with the crypto extension implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS sha256-ppc.lo"
	;;
	powerpc--)
	# Big-Endian.
	# Build with the crypto extension implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS sha256-ppc.lo"
	esac

	case "$mpi_cpu_arch" in
	x86)
	# Build with the SHAEXT implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha256-intel-shaext.lo"
	;;
	esac
	fi

	LIST_MEMBER(sha512, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha512.lo"
	AC_DEFINE(USE_SHA512, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha512-ssse3-amd64.lo"
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha512-avx-amd64.lo"
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha512-avx2-bmi2-amd64.lo"
	;;
	i?86--)
	# Build with the assembly implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha512-ssse3-i386.lo"
	;;
	arm--*)
	# Build with the assembly implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha512-arm.lo"
	;;
	powerpc64le--)
	# Build with the crypto extension implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS sha512-ppc.lo"
	;;
	powerpc64--)
	# Big-Endian.
	# Build with the crypto extension implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS sha512-ppc.lo"
	;;
	powerpc--)
	# Big-Endian.
	# Build with the crypto extension implementation
	GCRYPT_CIPHERS="$GCRYPT_CIPHERS sha512-ppc.lo"
	esac

	if test x"$neonsupport" = xyes ; then
	# Build with the NEON implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha512-armv7-neon.lo"
	fi
	fi

	LIST_MEMBER(sha3, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS keccak.lo"
	AC_DEFINE(USE_SHA3, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	:
	;;
	esac

	if test x"$neonsupport" = xyes ; then
	# Build with the NEON implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS keccak-armv7-neon.lo"
	fi
	fi

	LIST_MEMBER(tiger, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS tiger.lo"
	AC_DEFINE(USE_TIGER, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(whirlpool, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS whirlpool.lo"
	AC_DEFINE(USE_WHIRLPOOL, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS whirlpool-sse2-amd64.lo"
	;;
	esac
	fi

	LIST_MEMBER(blake2, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS blake2.lo"
	AC_DEFINE(USE_BLAKE2, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS blake2b-amd64-avx2.lo"
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS blake2s-amd64-avx.lo"
	;;
	esac
	fi

	# SHA-1 needs to be included always for example because it is used by
	# random-csprng.c.
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha1.lo"
	AC_DEFINE(USE_SHA1, 1, [Defined if this module should be included])

	case "${host}" in
	x86_64--)
	# Build with the assembly implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha1-ssse3-amd64.lo"
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha1-avx-amd64.lo"
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha1-avx-bmi2-amd64.lo"
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha1-avx2-bmi2-amd64.lo"
	;;
	arm--*)
	# Build with the assembly implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha1-armv7-neon.lo"
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha1-armv8-aarch32-ce.lo"
	;;
	aarch64--)
	# Build with the assembly implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha1-armv8-aarch64-ce.lo"
	;;
	esac

	case "$mpi_cpu_arch" in
	x86)
	# Build with the SHAEXT implementation
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sha1-intel-shaext.lo"
	;;
	esac

	LIST_MEMBER(sm3, $enabled_digests)
	if test "$found" = "1" ; then
	GCRYPT_DIGESTS="$GCRYPT_DIGESTS sm3.lo"
	AC_DEFINE(USE_SM3, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(scrypt, $enabled_kdfs)
	if test "$found" = "1" ; then
	GCRYPT_KDFS="$GCRYPT_KDFS scrypt.lo"
	AC_DEFINE(USE_SCRYPT, 1, [Defined if this module should be included])
	fi

	LIST_MEMBER(linux, $random_modules)
	if test "$found" = "1" ; then
	GCRYPT_RANDOM="$GCRYPT_RANDOM rndlinux.lo"
	AC_DEFINE(USE_RNDLINUX, 1, [Defined if the /dev/random RNG should be used.])
	fi

	LIST_MEMBER(unix, $random_modules)
	if test "$found" = "1" ; then
	GCRYPT_RANDOM="$GCRYPT_RANDOM rndunix.lo"
	AC_DEFINE(USE_RNDUNIX, 1, [Defined if the default Unix RNG should be used.])
	fi

	LIST_MEMBER(egd, $random_modules)
	if test "$found" = "1" ; then
	GCRYPT_RANDOM="$GCRYPT_RANDOM rndegd.lo"
	AC_DEFINE(USE_RNDEGD, 1, [Defined if the EGD based RNG should be used.])
	fi

	LIST_MEMBER(w32, $random_modules)
	if test "$found" = "1" ; then
	GCRYPT_RANDOM="$GCRYPT_RANDOM rndw32.lo"
	AC_DEFINE(USE_RNDW32, 1,
	[Defined if the Windows specific RNG should be used.])
	fi

	LIST_MEMBER(w32ce, $random_modules)
	if test "$found" = "1" ; then
	GCRYPT_RANDOM="$GCRYPT_RANDOM rndw32ce.lo"
	AC_DEFINE(USE_RNDW32CE, 1,
	[Defined if the WindowsCE specific RNG should be used.])
	fi

	AC_SUBST([GCRYPT_CIPHERS])
	AC_SUBST([GCRYPT_PUBKEY_CIPHERS])
	AC_SUBST([GCRYPT_DIGESTS])
	AC_SUBST([GCRYPT_KDFS])
	AC_SUBST([GCRYPT_RANDOM])

	AC_SUBST(LIBGCRYPT_CIPHERS, $enabled_ciphers)
	AC_SUBST(LIBGCRYPT_PUBKEY_CIPHERS, $enabled_pubkey_ciphers)
	AC_SUBST(LIBGCRYPT_DIGESTS, $enabled_digests)

	# For printing the configuration we need a colon separated list of
	# algorithm names.
	tmp=`echo "$enabled_ciphers" \| tr ' ' : `
	AC_DEFINE_UNQUOTED(LIBGCRYPT_CIPHERS, "$tmp",
	[List of available cipher algorithms])
	tmp=`echo "$enabled_pubkey_ciphers" \| tr ' ' : `
	AC_DEFINE_UNQUOTED(LIBGCRYPT_PUBKEY_CIPHERS, "$tmp",
	[List of available public key cipher algorithms])
	tmp=`echo "$enabled_digests" \| tr ' ' : `
	AC_DEFINE_UNQUOTED(LIBGCRYPT_DIGESTS, "$tmp",
	[List of available digest algorithms])
	tmp=`echo "$enabled_kdfs" \| tr ' ' : `
	AC_DEFINE_UNQUOTED(LIBGCRYPT_KDFS, "$tmp",
	[List of available KDF algorithms])


	#
	# Define conditional sources depending on the used hardware platform.
	# Note that all possible modules must also be listed in
	# src/Makefile.am (EXTRA_libgcrypt_la_SOURCES).
	#
	GCRYPT_HWF_MODULES=
	case "$mpi_cpu_arch" in
	x86)
	AC_DEFINE(HAVE_CPU_ARCH_X86, 1, [Defined for the x86 platforms])
	GCRYPT_HWF_MODULES="libgcrypt_la-hwf-x86.lo"
	;;
	alpha)
	AC_DEFINE(HAVE_CPU_ARCH_ALPHA, 1, [Defined for Alpha platforms])
	;;
	sparc)
	AC_DEFINE(HAVE_CPU_ARCH_SPARC, 1, [Defined for SPARC platforms])
	;;
	mips)
	AC_DEFINE(HAVE_CPU_ARCH_MIPS, 1, [Defined for MIPS platforms])
	;;
	m68k)
	AC_DEFINE(HAVE_CPU_ARCH_M68K, 1, [Defined for M68k platforms])
	;;
	ppc)
	AC_DEFINE(HAVE_CPU_ARCH_PPC, 1, [Defined for PPC platforms])
	GCRYPT_HWF_MODULES="libgcrypt_la-hwf-ppc.lo"
	;;
	arm)
	AC_DEFINE(HAVE_CPU_ARCH_ARM, 1, [Defined for ARM platforms])
	GCRYPT_HWF_MODULES="libgcrypt_la-hwf-arm.lo"
	;;
	aarch64)
	AC_DEFINE(HAVE_CPU_ARCH_ARM, 1, [Defined for ARM AArch64 platforms])
	GCRYPT_HWF_MODULES="libgcrypt_la-hwf-arm.lo"
	;;
	s390x)
	AC_DEFINE(HAVE_CPU_ARCH_S390X, 1, [Defined for s390x/zSeries platforms])
	GCRYPT_HWF_MODULES="libgcrypt_la-hwf-s390x.lo"
	;;
	esac
	AC_SUBST([GCRYPT_HWF_MODULES])


	#
	# Option to disable building of doc file
	#
	build_doc=yes
	AC_ARG_ENABLE([doc], AS_HELP_STRING([--disable-doc],
	[do not build the documentation]),
	build_doc=$enableval, build_doc=yes)
	AM_CONDITIONAL([BUILD_DOC], [test "x$build_doc" != xno])


	#
	# Provide information about the build.
	#
	BUILD_REVISION="mym4_revision"
	AC_SUBST(BUILD_REVISION)
	AC_DEFINE_UNQUOTED(BUILD_REVISION, "$BUILD_REVISION",
	[GIT commit id revision used to build this package])

	changequote(,)dnl
	BUILD_VERSION=`echo "$PACKAGE_VERSION" \| sed 's/$[0-9.]$./\1./'`
	changequote([,])dnl
	BUILD_VERSION="${BUILD_VERSION}mym4_revision_dec"
	BUILD_FILEVERSION=`echo "${BUILD_VERSION}" \| tr . ,`
	AC_SUBST(BUILD_VERSION)
	AC_SUBST(BUILD_FILEVERSION)

	AC_ARG_ENABLE([build-timestamp],
	AS_HELP_STRING([--enable-build-timestamp],
	[set an explicit build timestamp for reproducibility.
	(default is the current time in ISO-8601 format)]),
	[if test "$enableval" = "yes"; then
	BUILD_TIMESTAMP=`date -u +%Y-%m-%dT%H:%M+0000 2>/dev/null \|\| date`
	else
	BUILD_TIMESTAMP="$enableval"
	fi],
	[BUILD_TIMESTAMP="<none>"])
	AC_SUBST(BUILD_TIMESTAMP)
	AC_DEFINE_UNQUOTED(BUILD_TIMESTAMP, "$BUILD_TIMESTAMP",
	[The time this package was configured for a build])


	# And create the files.
	AC_CONFIG_FILES([
	Makefile
	m4/Makefile
	compat/Makefile
	mpi/Makefile
	cipher/Makefile
	random/Makefile
	doc/Makefile
	src/Makefile
	src/gcrypt.h
	src/libgcrypt-config
	src/libgcrypt.pc
	src/versioninfo.rc
	tests/Makefile
	])
	AC_CONFIG_FILES([tests/hashtest-256g], [chmod +x tests/hashtest-256g])
	AC_CONFIG_FILES([tests/basic-disable-all-hwf], [chmod +x tests/basic-disable-all-hwf])
	AC_OUTPUT


	detection_module="${GCRYPT_HWF_MODULES%.lo}"
	test -n "$detection_module" \|\| detection_module="none"

	# Give some feedback
	GCRY_MSG_SHOW([],[])
	GCRY_MSG_SHOW([Libgcrypt],[v${VERSION} has been configured as follows:])
	GCRY_MSG_SHOW([],[])
	GCRY_MSG_SHOW([Platform: ],[$PRINTABLE_OS_NAME ($host)])
	GCRY_MSG_SHOW([Hardware detection module:],[$detection_module])
	GCRY_MSG_WRAP([Enabled cipher algorithms:],[$enabled_ciphers])
	GCRY_MSG_WRAP([Enabled digest algorithms:],[$enabled_digests])
	GCRY_MSG_WRAP([Enabled kdf algorithms: ],[$enabled_kdfs])
	GCRY_MSG_WRAP([Enabled pubkey algorithms:],[$enabled_pubkey_ciphers])
	GCRY_MSG_SHOW([Random number generator: ],[$random])
	GCRY_MSG_SHOW([Try using jitter entropy: ],[$jentsupport])
	GCRY_MSG_SHOW([Using linux capabilities: ],[$use_capabilities])
	GCRY_MSG_SHOW([Try using Padlock crypto: ],[$padlocksupport])
	GCRY_MSG_SHOW([Try using AES-NI crypto: ],[$aesnisupport])
	GCRY_MSG_SHOW([Try using Intel SHAEXT: ],[$shaextsupport])
	GCRY_MSG_SHOW([Try using Intel PCLMUL: ],[$pclmulsupport])
	GCRY_MSG_SHOW([Try using Intel SSE4.1: ],[$sse41support])
	GCRY_MSG_SHOW([Try using DRNG (RDRAND): ],[$drngsupport])
	GCRY_MSG_SHOW([Try using Intel AVX: ],[$avxsupport])
	GCRY_MSG_SHOW([Try using Intel AVX2: ],[$avx2support])
	GCRY_MSG_SHOW([Try using ARM NEON: ],[$neonsupport])
	GCRY_MSG_SHOW([Try using ARMv8 crypto: ],[$armcryptosupport])
	GCRY_MSG_SHOW([Try using PPC crypto: ],[$ppccryptosupport])
	GCRY_MSG_SHOW([],[])

	if test "x${gpg_config_script_warn}" != x; then
	cat <<G10EOF
	Mismatches between the target platform and the to
	be used libraries have been been detected for:
	${gpg_config_script_warn}
	Please check above for warning messages.

	G10EOF
	fi

	if test "$gcry_cv_gcc_attribute_aligned" != "yes" ; then
	cat <<G10EOF
	Please not that your compiler does not support the GCC style
	aligned attribute. Using this software may evoke bus errors.

	G10EOF
	fi

	if test -n "$gpl"; then
	echo "Please note that you are building a version of Libgcrypt with"
	echo " $gpl"
	echo "included. These parts are licensed under the GPL and thus the"
	echo "use of this library has to comply with the conditions of the GPL."
	echo ""
	fi

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