There is a regression in GnuPG 2.1.15.

After building

  npth-1.2          with --prefix=/xxx --enable-static --disable-shared
  libgpg-error-1.24 with --prefix=/xxx --enable-static --disable-shared
  libassuan-2.4.3   with --prefix=/xxx --enable-static --disable-shared --with-gpg-error-prefix=/xxx
  libgcrypt-1.7.3   with --prefix=/xxx --enable-static --disable-shared --with-gpg-error-prefix=/xxx
  libksba-1.3.5     with --prefix=/xxx --enable-static --disable-shared --with-gpg-error-prefix=/xxx

I can build without any problems:

  gnupg-2.1.14      with --prefix=/xxx --with-gpg-error-prefix=/xxx --with-npth-prefix=/xxx --with-libassuan-prefix=/xxx --with-libgcrypt-prefix=/xxx --with-ksba-prefix=/xxx

But I cannot build

  gnupg-2.1.15      with the identical options.

Compilation fails with these messages:

Making all in dirmngr
make[2]: Entering directory `/aaa/gnupg-2.1.15/dirmngr'
make all-am
make[3]: Entering directory `/aaa/gnupg-2.1.15/dirmngr'
gcc -I/xxx/include -I/xxx/include -Wall -Wno-pointer-sign -Wpointer-arith -g -O2 -lrt -o dirmngr_ldap dirmngr_ldap-dirmngr_ldap.o ../common/libcommon.a no-libgcrypt.o -L/xxx/lib -lgpg-error -L/xxx/lib -lgcrypt -lgpg-error -L/xxx/lib -lldap -llber
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_free':
/aaa/libgcrypt-1.7.3/src/visibility.c:1554: multiple definition of `gcry_free'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:111: first defined here
/usr/bin/ld: Warning: size of symbol `gcry_free' changed from 18 in no-libgcrypt.o to 5 in /xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o)
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_xstrdup':
/aaa/libgcrypt-1.7.3/src/visibility.c:1548: multiple definition of `gcry_xstrdup'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:100: first defined here
/usr/bin/ld: Warning: size of symbol `gcry_xstrdup' changed from 75 in no-libgcrypt.o to 5 in /xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o)
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_xrealloc':
/aaa/libgcrypt-1.7.3/src/visibility.c:1542: multiple definition of `gcry_xrealloc'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:73: first defined here
/usr/bin/ld: Warning: size of symbol `gcry_xrealloc' changed from 29 in no-libgcrypt.o to 5 in /xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o)
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_xcalloc':
/aaa/libgcrypt-1.7.3/src/visibility.c:1524: multiple definition of `gcry_xcalloc'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:90: first defined here
/usr/bin/ld: Warning: size of symbol `gcry_xcalloc' changed from 29 in no-libgcrypt.o to 5 in /xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o)
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_xmalloc':
/aaa/libgcrypt-1.7.3/src/visibility.c:1518: multiple definition of `gcry_xmalloc'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:48: first defined here
/usr/bin/ld: Warning: size of symbol `gcry_xmalloc' changed from 29 in no-libgcrypt.o to 5 in /xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o)
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_strdup':
/aaa/libgcrypt-1.7.3/src/visibility.c:1512: multiple definition of `gcry_strdup'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:57: first defined here
/usr/bin/ld: Warning: size of symbol `gcry_strdup' changed from 68 in no-libgcrypt.o to 5 in /xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o)
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_realloc':
/aaa/libgcrypt-1.7.3/src/visibility.c:1506: multiple definition of `gcry_realloc'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:68: first defined here
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_malloc_secure':
/aaa/libgcrypt-1.7.3/src/visibility.c:1494: multiple definition of `gcry_malloc_secure'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:43: first defined here
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_calloc':
/aaa/libgcrypt-1.7.3/src/visibility.c:1488: multiple definition of `gcry_calloc'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:85: first defined here
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_malloc':
/aaa/libgcrypt-1.7.3/src/visibility.c:1482: multiple definition of `gcry_malloc'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:37: first defined here
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_set_log_handler':
/aaa/libgcrypt-1.7.3/src/visibility.c:1470: multiple definition of `gcry_set_log_handler'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:144: first defined here
/usr/bin/ld: Warning: size of symbol `gcry_set_log_handler' changed from 2 in no-libgcrypt.o to 5 in /xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o)
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_set_fatalerror_handler':
/aaa/libgcrypt-1.7.3/src/visibility.c:1464: multiple definition of `gcry_set_fatalerror_handler'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:137: first defined here
/usr/bin/ld: Warning: size of symbol `gcry_set_fatalerror_handler' changed from 2 in no-libgcrypt.o to 5 in /xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o)
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_set_outofcore_handler':
/aaa/libgcrypt-1.7.3/src/visibility.c:1458: multiple definition of `gcry_set_outofcore_handler'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:130: first defined here
/usr/bin/ld: Warning: size of symbol `gcry_set_outofcore_handler' changed from 2 in no-libgcrypt.o to 5 in /xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o)
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_create_nonce':
/aaa/libgcrypt-1.7.3/src/visibility.c:1351: multiple definition of `gcry_create_nonce'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:149: first defined here
/usr/bin/ld: Warning: size of symbol `gcry_create_nonce' changed from 16 in no-libgcrypt.o to 90 in /xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o)
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_cipher_algo_name':
/aaa/libgcrypt-1.7.3/src/visibility.c:800: multiple definition of `gcry_cipher_algo_name'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:162: first defined here
/usr/bin/ld: Warning: size of symbol `gcry_cipher_algo_name' changed from 6 in no-libgcrypt.o to 5 in /xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o)
/xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o): In function `gcry_control':
/aaa/libgcrypt-1.7.3/src/visibility.c:74: multiple definition of `gcry_control'
no-libgcrypt.o:/aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c:123: first defined here
/usr/bin/ld: Warning: size of symbol `gcry_control' changed from 3 in no-libgcrypt.o to 163 in /xxx/lib/libgcrypt.a(libgcrypt_la-visibility.o)
collect2: ld gab 1 als Ende-Status zurück
make[3]: * [dirmngr_ldap] Fehler 1
make[3]: Leaving directory `/aaa/gnupg-2.1.15/dirmngr'
make[2]: * [all] Fehler 2
make[2]: Leaving directory `/aaa/gnupg-2.1.15/dirmngr'
make[1]: * [all-recursive] Fehler 1
make[1]: Leaving directory `/aaa/gnupg-2.1.15'
make: * [all] Fehler 2

Most probably /aaa/gnupg-2.1.15/dirmngr/no-libgcrypt.c is being used where it shouldn't.

Do you need further information?

Thank you

Perhaps the following change between 2.1.14 and 2.1.15 has something to do with the problem: It causes
both no-libgcrypt.o and $(LIBGCRYPT_LIBS) to be linked in.

diff -ru gnupg-2.1.14/dirmngr/Makefile.am gnupg-2.1.15/dirmngr/Makefile.am

• gnupg-2.1.14/dirmngr/Makefile.am 2016-06-16 17:23:13.000000000 +0200

+++ gnupg-2.1.15/dirmngr/Makefile.am 2016-08-18 17:00:16.000000000 +0200
@@ -94,8 +94,8 @@
dirmngr_ldap_CFLAGS = $(GPG_ERROR_CFLAGS) $(LIBGCRYPT_CFLAGS)
dirmngr_ldap_LDFLAGS =
dirmngr_ldap_LDADD = $(libcommon) no-libgcrypt.o \

• $(GPG_ERROR_LIBS) $(LDAPLIBS) $(LBER_LIBS) $(LIBINTL) \
• $(LIBICONV)

+ $(GPG_ERROR_LIBS) $(LIBGCRYPT_LIBS) $(LDAPLIBS) \
+ $(LBER_LIBS) $(LIBINTL) $(LIBICONV)
endif

dirmngr_client_SOURCES = dirmngr-client.c

If a apply that fix to an unmodified 2.1.15, my problem is solved. Thank you!

Fixed in 2.1.16.