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gnutls: fix build on sparc

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gnutls source code uses the C++11 <atomic> functionality since
7978a73346,
which internally is implemented using the __atomic_*() gcc built-ins

On certain architectures, the __atomic_*() built-ins are implemented in
the libatomic library that comes with the rest of the gcc runtime. Due
to this, code using <atomic> might need to link against libatomic,
otherwise one hits build issues such as:

../lib/.libs/libgnutls.so: undefined reference to `__atomic_fetch_sub_4'

on an architecture like SPARC.

To solve this, a configure.ac check is added to know if we need to
link against libatomic or not. The library is also added to gnutls.pc.

Fixes:
 - http://autobuild.buildroot.org/results/6c749bd592ceffeacadd2ab570d127936cce64b2
 - http://autobuild.buildroot.org/results/30aa83d3cf3482af8a59250c196c85f4a278d343

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Tested-by: Matthew Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Fabrice Fontaine 2019-01-17 20:02:52 +01:00 committed by Peter Korsgaard
parent e2b98dfede
commit d2f606a646
2 changed files with 62 additions and 0 deletions
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60
package/gnutls/0001-configure.ac-check-if-libatomic-is-needed.patch Normal file
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@ -0,0 +1,60 @@
From cce372f10a755d59ccf09fb7dc6e87b416f63a6f Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Thu, 17 Jan 2019 10:50:00 +0100
Subject: [PATCH] configure.ac: check if libatomic is needed
gnutls source code uses the C++11 <atomic> functionality since
https://github.com/gnutls/gnutls/commit/7978a733460f92b31033affd0e487c86d66c643d,
which internally is implemented using the __atomic_*() gcc built-ins
On certain architectures, the __atomic_*() built-ins are implemented in
the libatomic library that comes with the rest of the gcc runtime. Due
to this, code using <atomic> might need to link against libatomic,
otherwise one hits build issues such as:
../lib/.libs/libgnutls.so: undefined reference to `__atomic_fetch_sub_4'
on an architecture like SPARC.
To solve this, a configure.ac check is added to know if we need to
link against libatomic or not. The library is also added to gnutls.pc.
Fixes:
- http://autobuild.buildroot.org/results/6c749bd592ceffeacadd2ab570d127936cce64b2
- http://autobuild.buildroot.org/results/30aa83d3cf3482af8a59250c196c85f4a278d343
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Upstream status: https://gitlab.com/gnutls/gnutls/merge_requests/878]
---
configure.ac | 2 ++
lib/gnutls.pc.in | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/configure.ac b/configure.ac
index e81ff8970..b2c0c2b3d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -207,6 +207,8 @@ dnl Need netinet/tcp.h for TCP_FASTOPEN
AC_CHECK_HEADERS([netinet/tcp.h])
AC_CHECK_HEADERS([stdatomic.h])
+AC_SEARCH_LIBS([__atomic_load_4], [atomic], [AC_SUBST([LIBATOMIC_LIBS], [-latomic])])
+
dnl We use its presence to detect C11 threads
AC_CHECK_HEADERS([threads.h])
diff --git a/lib/gnutls.pc.in b/lib/gnutls.pc.in
index 9f26852cc..68be2d110 100644
--- a/lib/gnutls.pc.in
+++ b/lib/gnutls.pc.in
@@ -19,6 +19,6 @@ Description: Transport Security Layer implementation for the GNU system
URL: http://www.gnutls.org/
Version: @VERSION@
Libs: -L${libdir} -lgnutls
-Libs.private: @LIBINTL@ @LIBSOCKET@ @LIBNSL@ @LIBPTHREAD@ @LIB_SELECT@ @TSS_LIBS@ @GMP_LIBS@ @LIBUNISTRING@ @LIBIDN2_LIBS@
+Libs.private: @LIBINTL@ @LIBSOCKET@ @LIBNSL@ @LIBPTHREAD@ @LIB_SELECT@ @TSS_LIBS@ @GMP_LIBS@ @LIBUNISTRING@ @LIBIDN2_LIBS@ @LIBATOMIC_LIBS@
@GNUTLS_REQUIRES_PRIVATE@
Cflags: -I${includedir}
--
2.14.1

2
package/gnutls/gnutls.mk
View File

@ -27,6 +27,8 @@ GNUTLS_CONF_ENV = gl_cv_socket_ipv6=yes \
gt_cv_c_wint_t=$(if $(BR2_USE_WCHAR),yes,no) \
gl_cv_func_gettimeofday_clobber=no
GNUTLS_INSTALL_STAGING = YES
# We're patching configure.ac
GNUTLS_AUTORECONF = YES
# libpthread autodetection poison the linkpath
GNUTLS_CONF_OPTS += $(if $(BR2_TOOLCHAIN_HAS_THREADS),--with-libpthread-prefix=$(STAGING_DIR)/usr)