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	# configure.ac for libgpg-error
	# Copyright (C) 2003, 2004, 2006, 2010, 2013, 2014, 2015 g10 Code GmbH
	#
	# This file is part of libgpg-error.
	#
	# libgpg-error 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.
	#
	# libgpg-error 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 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.)
	# The following lines are used by ./autogen.sh.
	AC_PREREQ(2.59)
	min_automake_version="1.14"

	# To build a release you need to create a tag with the version number
	# (git tag -s libgpg-error-n.m) and run "./autogen.sh --force".
	# Please bump the version number immediately after the release, do
	# another commit, and a push so that the git magic is able to work.
	# See below for the LT versions.
	m4_define([mym4_version_major], [1])
	m4_define([mym4_version_minor], [18])

	# Below is m4 magic to extract and compute the revision number, the
	# decimalized short revision number, a beta version string, and a flag
	# indicating a development version (mym4_isgit). Note that the m4
	# processing is done by autoconf and not during the configure run.
	m4_define([mym4_version], [mym4_version_major.mym4_version_minor])
	m4_define([mym4_revision],
	m4_esyscmd([git rev-parse --short HEAD \| tr -d '\n\r']))
	m4_define([mym4_revision_dec],
	m4_esyscmd_s([echo $((0x$(echo ]mym4_revision[\|head -c 4)))]))
	m4_define([mym4_betastring],
	m4_esyscmd_s([git describe --match 'libgpg-error-[0-9].*[0-9]' --long\|\
	awk -F- '$4!=0{print"-beta"$4}']))
	m4_define([mym4_isgit],m4_if(mym4_betastring,[],[no],[yes]))
	m4_define([mym4_full_version],[mym4_version[]mym4_betastring])

	AC_INIT([libgpg-error],[mym4_full_version],[http://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)
	# Note that added error codes don't constitute an interface change.
	LIBGPG_ERROR_LT_CURRENT=14
	LIBGPG_ERROR_LT_AGE=14
	LIBGPG_ERROR_LT_REVISION=0
	################################################

	AC_SUBST(LIBGPG_ERROR_LT_CURRENT)
	AC_SUBST(LIBGPG_ERROR_LT_AGE)
	AC_SUBST(LIBGPG_ERROR_LT_REVISION)

	VERSION_NUMBER=m4_esyscmd(printf "0x%02x%02x00" mym4_version_major \
	mym4_version_minor)
	AC_SUBST(VERSION_NUMBER)

	AC_CONFIG_AUX_DIR([build-aux])
	AM_INIT_AUTOMAKE([serial-tests dist-bzip2])
	AM_MAINTAINER_MODE
	AC_CONFIG_SRCDIR([src/err-sources.h.in])
	AC_CONFIG_HEADER([config.h])
	AC_CONFIG_MACRO_DIR([m4])
	AM_SILENT_RULES

	# We need to know about the host architecture to avoid spurious
	# warnings.
	AC_CANONICAL_HOST
	AB_INIT

	# Checks for programs.
	AC_PROG_CC
	AM_PROG_CC_C_O
	AC_PROG_CPP
	AC_PROG_AWK
	AC_CHECK_TOOL(AR, ar, :)
	AC_GNU_SOURCE

	# Set some internal variables depending on the platform for later use.
	have_w32_system=no
	have_w64_system=no
	have_w32ce_system=no
	case "${host}" in
	x86_64-mingw32)
	have_w32_system=yes
	have_w64_system=yes
	;;
	-mingw32ce)
	have_w32_system=yes
	have_w32ce_system=yes
	;;
	-mingw32)
	have_w32_system=yes
	;;
	*)
	;;
	esac


	if test "$have_w32_system" != yes; then
	gl_THREADLIB_EARLY
	fi

	# We build libgpg-error with large file support so that we have a 64
	# bit off_t. Our external interface uses the gpgrt_off_t which is
	# anyway specified as 64 bit. Thus the same libgpg-error can be used
	# by software which is not build with large file support.
	AC_SYS_LARGEFILE


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


	# We need to compile and run a program on the build machine.
	dnl The AC_PROG_CC_FOR_BUILD macro in the AC archive is broken for
	dnl autoconf 2.57.
	dnl AC_PROG_CC_FOR_BUILD
	AC_MSG_CHECKING(for cc for build)
	if test "$cross_compiling" = "yes"; then
	CC_FOR_BUILD="${CC_FOR_BUILD-cc}"
	else
	CC_FOR_BUILD="${CC_FOR_BUILD-$CC}"
	fi
	AC_MSG_RESULT($CC_FOR_BUILD)
	AC_ARG_VAR(CC_FOR_BUILD,[build system C compiler])


	AH_BOTTOM([
	/* Force using of NLS for W32 even if no libintl has been found. This is
	okay because we have our own gettext implementation for W32. */
	#if defined(HAVE_W32_SYSTEM) && !defined(ENABLE_NLS)
	#define ENABLE_NLS 1
	#endif

	/* Connect the generic estream-printf.c to our framework. */
	#define _ESTREAM_PRINTF_REALLOC _gpgrt_realloc
	#define _ESTREAM_PRINTF_EXTRA_INCLUDE "gpgrt-int.h"

	/* For building we need to define these macro. */
	#define GPG_ERR_ENABLE_GETTEXT_MACROS 1
	#define GPG_ERR_ENABLE_ERRNO_MACROS 1
	#define GPGRT_ENABLE_ES_MACROS 1
	])


	# Note, that autogen.sh greps for the next line.
	AM_GNU_GETTEXT_VERSION([0.19.3])
	AM_GNU_GETTEXT([external])

	# Checks for header files.
	AC_HEADER_STDC
	AC_CHECK_HEADERS([stdlib.h locale.h stdint.h])
	AC_FUNC_STRERROR_R
	case "${host_os}" in
	solaris*)
	# All versions of Solaris from 2.4 have a thread-safe strerror().
	# Since Solaris 10, in addition strerror_r() exists.
	;;
	*)
	AC_CHECK_FUNC([strerror_r], [],
	AC_MSG_WARN([[Without strerror_r, gpg_strerror_r might not be thread-safe]]))
	;;
	esac

	AC_CHECK_FUNCS([flockfile vasprintf])


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

	AC_CHECK_SIZEOF(int)
	AC_CHECK_SIZEOF(long)
	AC_CHECK_SIZEOF(long long)

	# Find a 64 bit integer type to be used instead of off_t. We prefer
	# the standard integer types over int64_t and finally try long long.
	if test "$ac_cv_sizeof_int" = "8"; then
	replacement_for_off_t="int"
	elif test "$ac_cv_sizeof_long" = "8"; then
	replacement_for_off_t="long"
	elif test "$ac_cv_header_stdint_h" = yes; then
	replacement_for_off_t="int64_t"
	elif test "$ac_cv_sizeof_long_long" = "8"; then
	replacement_for_off_t="long long"
	else
	AC_MSG_ERROR([[
	***
	*** No 64 bit signed integer type found. Can't build this library.
	***]])
	fi
	AC_DEFINE_UNQUOTED(REPLACEMENT_FOR_OFF_T, "$replacement_for_off_t",
	[Used by mkheader to insert the replacement type.])



	#
	# Setup gcc specific options
	#
	AC_MSG_NOTICE([checking for cc features])
	if test "$GCC" = yes; then
	# Check whether gcc does not emit a diagnostic for unknown -Wno-*
	# options. This is the case for gcc >= 4.6
	AC_MSG_CHECKING([if gcc ignores unknown -Wno-* options])
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#if __GNUC__ < 4 \|\| (__GNUC__ == 4 && __GNUC_MINOR__ < 6 )
	#kickerror
	#endif]],[])],[_gcc_silent_wno=yes],[_gcc_silent_wno=no])
	AC_MSG_RESULT($_gcc_silent_wno)

	# Note that it is okay to use CFLAGS here because these are just
	# warning options and the user should have a chance of overriding
	# them.
	if test "$USE_MAINTAINER_MODE" = "yes"; then
	CFLAGS="$CFLAGS -O3 -Wall -Wcast-align -Wshadow -Wstrict-prototypes"
	CFLAGS="$CFLAGS -Wformat -Wno-format-y2k -Wformat-security"
	if test x"$_gcc_silent_wno" = xyes ; then
	_gcc_wopt=yes
	else
	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=$_gcc_cflags_save;
	fi
	if test x"$_gcc_wopt" = xyes ; then
	CFLAGS="$CFLAGS -W -Wno-sign-compare -Wno-missing-field-initializers"
	fi

	AC_MSG_CHECKING([if gcc supports -Wdeclaration-after-statement])
	_gcc_cflags_save=$CFLAGS
	CFLAGS="-Wdeclaration-after-statement"
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],_gcc_wopt=yes,_gcc_wopt=no)
	AC_MSG_RESULT($_gcc_wopt)
	CFLAGS=$_gcc_cflags_save;
	if test x"$_gcc_wopt" = xyes ; then
	CFLAGS="$CFLAGS -Wdeclaration-after-statement"
	fi
	else
	CFLAGS="$CFLAGS -Wall"
	fi

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

	# The undocumented option -Wno-psabi suppresses the annoying
	# "the ABI of passing union with long double has changed in GCC 4.4"
	# which is emitted in estream-printf.c but entirely irrelvant
	# because that union is local to the file.
	if test x"$_gcc_silent_wno" = xyes ; then
	CFLAGS="$CFLAGS -Wno-psabi"
	fi
	fi

	#
	# 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 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(GPGRT_USE_VISIBILITY, 1,
	[Define to use the GNU C visibility attribute.])
	CFLAGS="$CFLAGS -fvisibility=hidden"
	fi

	#
	# Check whether ld supports a version script.
	# (Actually not a check but a list of systems which are known to support it.)
	#
	have_ld_version_script=no
	case "${host}" in
	--linux*)
	have_ld_version_script=yes
	;;
	--gnu*)
	have_ld_version_script=yes
	;;
	esac
	AC_ARG_ENABLE([ld-version-script],
	AC_HELP_STRING([--enable-ld-version-script],
	[enable/disable use of linker version script.
	(default is system dependent)]),
	[have_ld_version_script=$enableval],
	[ : ] )
	AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")


	#
	# Check for thread library.
	#
	# Windows has always thread support; thus we don't bother to test for
	# it as it may lead to false results when cross building.
	if test "$have_w32_system" = yes; then
	AC_DEFINE([USE_WINDOWS_THREADS], [1])
	LIBTHREAD=
	LTLIBTHREAD=
	LIBMULTITHREAD=
	LTLIBMULTITHREAD=
	THREADLIB_CPPFLAGS=""
	AC_SUBST([LIBTHREAD])
	AC_SUBST([LTLIBTHREAD])
	AC_SUBST([LIBMULTITHREAD])
	AC_SUBST([LTLIBMULTITHREAD])
	else
	gl_LOCK
	if test "$gl_threads_api" = posix; then
	AC_CHECK_SIZEOF(pthread_mutex_t,,[AC_INCLUDES_DEFAULT
	#include <pthread.h>])
	fi
	fi

	#
	# Prepare building of estream
	#
	estream_INIT

	#
	# Substitution used for gpg-error-config
	#
	GPG_ERROR_CONFIG_LIBS="-lgpg-error"
	if test "x$LIBTHREAD" != x; then
	GPG_ERROR_CONFIG_LIBS="${GPG_ERROR_CONFIG_LIBS} ${LIBTHREAD}"
	fi
	if test "x$LIBMULTITHREAD" != x; then
	GPG_ERROR_CONFIG_MT_LIBS="${LIBMULTITHREAD}"
	else
	GPG_ERROR_CONFIG_MT_LIBS=""
	fi
	GPG_ERROR_CONFIG_CFLAGS=""
	if test "x$THREADLIB_CPPFLAGS" != x; then
	GPG_ERROR_CONFIG_MT_CFLAGS="${THREADLIB_CPPFLAGS}"
	else
	GPG_ERROR_CONFIG_MT_CFLAGS=""
	fi
	GPG_ERROR_CONFIG_ISUBDIRAFTER=""
	GPG_ERROR_CONFIG_HOST="$host"
	AC_SUBST(GPG_ERROR_CONFIG_LIBS)
	AC_SUBST(GPG_ERROR_CONFIG_CFLAGS)
	AC_SUBST(GPG_ERROR_CONFIG_MT_LIBS)
	AC_SUBST(GPG_ERROR_CONFIG_MT_CFLAGS)
	AC_SUBST(GPG_ERROR_CONFIG_ISUBDIRAFTER)
	AC_SUBST(GPG_ERROR_CONFIG_HOST)


	#
	# Special defines for certain platforms
	#
	force_use_syscfg=no
	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_w64_system" = yes; then
	AC_DEFINE(HAVE_W64_SYSTEM,1,[Defined if we run on 64 bit W32 API system])
	fi
	if test "$have_w32ce_system" = yes; then
	AC_DEFINE(HAVE_W32CE_SYSTEM,1,[Defined if we run on WindowsCE])
	GPG_ERROR_CONFIG_ISUBDIRAFTER="gpg-extra"
	fi
	force_use_syscfg=yes
	fi
	if test x$cross_compiling = xyes; then
	force_use_syscfg=yes
	fi

	AM_CONDITIONAL(HAVE_W32_SYSTEM, test "$have_w32_system" = yes)
	AM_CONDITIONAL(HAVE_W64_SYSTEM, test "$have_w64_system" = yes)
	AM_CONDITIONAL(HAVE_W32CE_SYSTEM, test "$have_w32ce_system" = yes)
	AM_CONDITIONAL(CROSS_COMPILING, test x$cross_compiling = xyes)
	AM_CONDITIONAL(FORCE_USE_SYSCFG, test x$force_use_syscfg = xyes)

	AC_DEFINE_UNQUOTED(HOST_TRIPLET_STRING, "$host", [The host triplet])


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


	AC_ARG_ENABLE([build-timestamp],
	AC_HELP_STRING([--enable-build-timestamp],
	[set an explicit build timestamp for reproducibility.
	(default is the current time in ISO-8601 format)]),
	[if test "$enableval" = "no"; then
	BUILD_TIMESTAMP="<none>"
	else
	BUILD_TIMESTAMP="$enableval"
	fi],
	[BUILD_TIMESTAMP=`date -u +%Y-%m-%dT%H:%M+0000 2>/dev/null \|\| date`])
	AC_SUBST(BUILD_TIMESTAMP)
	AC_DEFINE_UNQUOTED(BUILD_TIMESTAMP, "$BUILD_TIMESTAMP",
	[The time this package was configured for a build])



	AC_ARG_ENABLE(languages, AC_HELP_STRING([--disable-languages],
	[do not build support for other languages than C]))
	AM_CONDITIONAL([LANGUAGES_SOME], [test "x$enable_languages" != xno])

	build_doc=yes
	AC_ARG_ENABLE([doc], AC_HELP_STRING([--disable-doc],
	[do not build the documentation]),
	build_doc=$enableval, build_doc=yes)
	AM_CONDITIONAL([BUILD_DOC], [test "x$build_doc" != xno])


	#
	# Substitution
	#
	AC_CONFIG_FILES([Makefile])
	AC_CONFIG_FILES([doc/Makefile po/Makefile.in m4/Makefile])
	AC_CONFIG_FILES([src/Makefile tests/Makefile])
	AC_CONFIG_FILES([lang/Makefile lang/cl/Makefile lang/cl/gpg-error.asd])
	AC_CONFIG_FILES([src/versioninfo.rc])
	AC_CONFIG_FILES([src/gpg-error-config], [chmod +x src/gpg-error-config])

	AC_OUTPUT

	echo "
	$PACKAGE_NAME-$PACKAGE_VERSION prepared for make

	Revision: mym4_revision (mym4_revision_dec)
	Platform: $host
	"
	if test "$gcry_cv_gcc_attribute_aligned" != "yes" ; then
	cat <<G10EOF
	***
	*** Please note that your compiler does not support the GCC style
	*** aligned attribute. Using this software may evoke bus errors.
	***
	G10EOF
	fi

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