[Bug bootstrap/53238] Bootstrap failure: error: 'pthread_mutex_timedlock' was not declared in this scope

[skunk at iskunk dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53238

--- Comment #16 from Daniel Richard G. <skunk at iskunk dot org> 2012-07-19 21:10:28 UTC ---
Okay, spoke too soon; I encountered the same error later in the game, when
building the "pthread" variant of libstdc++-v3.

I'm going to try the build with a new patch, revisiting the code snippet in
comment #2:

--- libstdc++-v3/acinclude.m4    (revision 189681)
+++ libstdc++-v3/acinclude.m4    (working copy)
@@ -3282,13 +3282,18 @@

   AC_MSG_CHECKING([whether it can be safely assumed that mutex_timedlock is
available])

-  AC_TRY_COMPILE([#include <unistd.h>],
+  AC_TRY_COMPILE(
+    [
+      #include <stdlib.h>
+      #include <unistd.h>
+    ],
     [
       // In case of POSIX threads check _POSIX_TIMEOUTS.
       #if (defined(_PTHREADS) \
       && (!defined(_POSIX_TIMEOUTS) || _POSIX_TIMEOUTS <= 0))
       #error
       #endif
+      return pthread_mutex_timedlock(NULL, NULL)
     ], [ac_gthread_use_mutex_timedlock=1], [ac_gthread_use_mutex_timedlock=0])

   AC_DEFINE_UNQUOTED(_GTHREAD_USE_MUTEX_TIMEDLOCK,
$ac_gthread_use_mutex_timedlock,


Since the code is being compiled as C++, linking is not necessary to get an
error in case the function is missing. Will this work any better as a solution
than my suggestion in comment #4? (Might an "#ifndef WIN32" in there be
helpful?)