http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53238
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-05-04
20:57:34 UTC ---
_PTHREADS gets defined immediately above that test:
target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
case $target_thread_file in
posix)
CXXFLAGS="$CXXFLAGS -DSUPPORTS_WEAK -DGTHREAD_USE_WEAK -D_PTHREADS"
esac
If you're using --enable-thread=posix then it should be defined.
pthread_mutex_timedlock is part of the POSIX Threads and Timeouts options, and
if that option is supported then _POSIX_TIMEOUTS must be defined.
http://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_mutex_timedlock.html
