From 8eaf14a17244aaf000b4d19e4fde4a637576939f Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Sun, 7 Feb 2016 21:40:47 +0100 Subject: [PATCH] configure.ac: check if libatomic is needed The mpd source code uses the C++11 functionality, 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 might need to link against libatomic, otherwise one hits build issues such as: GlobalEvents.cxx:(.text._ZN12GlobalEvents4EmitENS_5EventE+0x14): undefined reference to `__atomic_fetch_or_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. Signed-off-by: Thomas Petazzoni --- configure.ac | 2 ++ 1 file changed, 2 insertions(+) diff --git a/configure.ac b/configure.ac index 107b45a..8e6fab7 100644 --- a/configure.ac +++ b/configure.ac @@ -233,6 +233,8 @@ if test x$have_pthread_setname_np = xyes; then AC_DEFINE(HAVE_PTHREAD_SETNAME_NP, 1, [Is pthread_setname_np() available?]) fi +AC_SEARCH_LIBS([__atomic_load_4], [atomic]) + dnl --------------------------------------------------------------------------- dnl Event loop selection dnl --------------------------------------------------------------------------- -- 2.6.4