Merge from gnulib.

2012-07-15 pthread_sigmask: fix bug on FreeBSD 9 (Bug#11884)
2012-07-11 gettext: do not assume '#define ... defined ...' behavior

ChangeLog

+2012-07-15  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Merge from gnulib, incorporating:
+	2012-07-15 pthread_sigmask: fix bug on FreeBSD 9 (Bug#11884)
+	2012-07-11 gettext: do not assume '#define ... defined ...' behavior
+
 2012-07-14  Glenn Morris  <rgm@gnu.org>
 
 	* configure.ac (GC_SETJMP_WORKS, GC_MARK_STACK): Move here from src/s.

lib/gettext.h

@@ -183,9 +183,12 @@ npgettext_aux (const char *domain,
 
 #include <string.h>
 
-#define _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS \
-  (((__GNUC__ >= 3 || __GNUG__ >= 2) && !defined __STRICT_ANSI__) \
-   /* || __STDC_VERSION__ >= 199901L */ )
+#if (((__GNUC__ >= 3 || __GNUG__ >= 2) && !defined __STRICT_ANSI__) \
+     /* || __STDC_VERSION__ >= 199901L */ )
+# define _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS 1
+#else
+# define _LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS 0
+#endif
 
 #if !_LIBGETTEXT_HAVE_VARIABLE_SIZE_ARRAYS
 #include <stdlib.h>

lib/pthread_sigmask.c

@@ -22,6 +22,10 @@
 #include <errno.h>
 #include <stddef.h>
 
+#if PTHREAD_SIGMASK_INEFFECTIVE
+# include <string.h>
+#endif
+
 #if PTHREAD_SIGMASK_UNBLOCK_BUG
 # include <unistd.h>
 #endif
@@ -31,7 +35,22 @@ pthread_sigmask (int how, const sigset_t *new_mask, sigset_t *old_mask)
 #undef pthread_sigmask
 {
 #if HAVE_PTHREAD_SIGMASK
-  int ret = pthread_sigmask (how, new_mask, old_mask);
+  int ret;
+
+# if PTHREAD_SIGMASK_INEFFECTIVE
+  sigset_t omask, omask_copy;
+  sigset_t *old_mask_ptr = &omask;
+  sigemptyset (&omask);
+  /* Add a signal unlikely to be blocked, so that OMASK_COPY
+     is unlikely to match the actual mask.  */
+  sigaddset (&omask, SIGILL);
+  memcpy (&omask_copy, &omask, sizeof omask);
+# else
+  sigset_t *old_mask_ptr = old_mask;
+# endif
+
+  ret = pthread_sigmask (how, new_mask, old_mask_ptr);
+
 # if PTHREAD_SIGMASK_INEFFECTIVE
   if (ret == 0)
     {
@@ -39,12 +58,16 @@ pthread_sigmask (int how, const sigset_t *new_mask, sigset_t *old_mask)
          Don't cache the information: libpthread.so could be dynamically
          loaded after the program started and after pthread_sigmask was
          called for the first time.  */
-      if (pthread_sigmask (1729, NULL, NULL) == 0)
+      if (memcmp (&omask_copy, &omask, sizeof omask) == 0
+          && pthread_sigmask (1729, &omask_copy, NULL) == 0)
         {
           /* pthread_sigmask is currently ineffective.  The program is not
              linked to -lpthread.  So use sigprocmask instead.  */
           return (sigprocmask (how, new_mask, old_mask) < 0 ? errno : 0);
         }
+
+      if (old_mask)
+        memcpy (old_mask, &omask, sizeof omask);
     }
 # endif
 # if PTHREAD_SIGMASK_FAILS_WITH_ERRNO