X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ftime_r.m4;h=b5938e79638a846153d3ac660a33bb24abb063f5;hb=f921c7d1ed533250523b43796cd53144c048b01f;hp=a4e016f81927cc9bb259ab0eb2c00c7ef78333d4;hpb=3ac9552429c5a500717e1d3d129c32f7d0ea37a3;p=gnulib.git

diff --git a/m4/time_r.m4 b/m4/time_r.m4
index a4e016f81..b5938e796 100644
--- a/m4/time_r.m4
+++ b/m4/time_r.m4
@@ -1,6 +1,7 @@
 dnl Reentrant time functions like localtime_r.
 
-dnl Copyright (C) 2003, 2006, 2007 Free Software Foundation, Inc.
+dnl Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Free Software Foundation,
+dnl Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -9,18 +10,23 @@ dnl Written by Paul Eggert.
 
 AC_DEFUN([gl_TIME_R],
 [
+ dnl Persuade glibc and Solaris <time.h> to declare localtime_r.
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+  AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
   AC_REQUIRE([AC_C_RESTRICT])
 
   AC_CACHE_CHECK([whether localtime_r is compatible with its POSIX signature],
     [gl_cv_time_r_posix],
-    [AC_TRY_COMPILE(
-       [#include <time.h>],
-       [/* We don't need to append 'restrict's to the argument types,
-	   even though the POSIX signature has the 'restrict's,
-	   since C99 says they can't affect type compatibility.  */
-	struct tm * (*ptr) (time_t const *, struct tm *) = localtime_r;
-        if (ptr) return 0;],
+    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+         [[#include <time.h>]],
+         [[/* We don't need to append 'restrict's to the argument types,
+              even though the POSIX signature has the 'restrict's,
+              since C99 says they can't affect type compatibility.  */
+           struct tm * (*ptr) (time_t const *, struct tm *) = localtime_r;
+           if (ptr) return 0;
+           /* Check the return type is a pointer.  On HP-UX 10 it is 'int'.  */
+           *localtime_r (0, 0);]])],
        [gl_cv_time_r_posix=yes],
        [gl_cv_time_r_posix=no])])
   if test $gl_cv_time_r_posix = yes; then