The mpd source code uses the C++11 <atomic> 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 <atomic> 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 <[email protected]> --- 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 _______________________________________________ mpd-devel mailing list [email protected] http://mailman.blarg.de/listinfo/mpd-devel
