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| author | Fabrice Fontaine <fontaine.fabrice@gmail.com> | 2019-01-17 13:24:04 +0100 |
|---|---|---|
| committer | Fabrice Fontaine <fontaine.fabrice@gmail.com> | 2019-01-17 13:24:04 +0100 |
| commit | 0169acbff91fca1483661d28552b459e909d3049 (patch) | |
| tree | cdf16a43d89646cd6ced5c74d28ef71d7dff8fba /configure.ac | |
| parent | b527be10f829e286130705dfd14f8bb5661e7f35 (diff) | |
| download | gnutls-0169acbff91fca1483661d28552b459e909d3049.tar.gz | |
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>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index e81ff89709..b2c0c2b3d9 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]) |