From f020fe05a20dfcd16cd7df833dcf3cdeef770538 Mon Sep 17 00:00:00 2001 From: Carlos Santos Date: Thu, 11 Feb 2016 10:58:35 -0200 Subject: [PATCH 2/2] configure.ac: check if libatomic is needed Compilation of protobuf for PowerPC and SPARC may fail due to missing references to __atomic_fetch_add_4 and __atomic_compare_exchange_4. The __atomic_*() intrinsics for all sizes are provided by libatomic when gcc is >= 4.8. This can be achieved by adding this to configure.ac: AC_SEARCH_LIBS([__atomic_fetch_add_4], [atomic]) Signed-off-by: Carlos Santos --- configure.ac | 2 ++ 1 file changed, 2 insertions(+) diff --git a/configure.ac b/configure.ac index c07067c..88d4a0d 100644 --- a/configure.ac +++ b/configure.ac @@ -160,6 +160,8 @@ AM_CONDITIONAL([HAVE_PTHREAD], [test "x$acx_pthread_ok" = "xyes"]) # We still keep this for improving pbconfig.h for unsupported platforms. AC_CXX_STL_HASH +AC_SEARCH_LIBS([__atomic_load_4], [atomic]) + case "$target_os" in mingw* | cygwin* | win*) ;; -- 2.5.0