Add 0 to _POSIX_SEMAPHORES. Will backport to 2.4.

loewis · loewis · commit 10c519280eeb · 2005-03-28T12:34:20.000Z
git-svn-id: http://svn.python.org/projects/python/trunk@38723 6015fed2-1504-0410-9fe1-9d1591cc4771
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
@@ -16,7 +16,9 @@
    family of functions must indicate this by defining
    _POSIX_SEMAPHORES. */   
 #ifdef _POSIX_SEMAPHORES
-#if _POSIX_SEMAPHORES == -1
+/* On FreeBSD 4.x, _POSIX_SEMAPHORES is defined empty, so 
+   we need to add 0 to make it work there as well. */
+#if (_POSIX_SEMAPHORES+0) == -1
 #define HAVE_BROKEN_POSIX_SEMAPHORES
 #else
 #include <semaphore.h>
