# HG changeset patch
# User Bruno Haible <bruno@clisp.org>
# Date 1270315993 -7200
# Node ID 5735734700f225334c41b3b4996bfa7a1151b7e0
# Parent  3a2049062a71f6caf65ae9fcfb6502feff19e4b8
timegm: Assume declaration if function exists.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2010-04-03  Bruno Haible  <bruno@clisp.org>
+
+	timegm: Assume declaration if function exists.
+	* m4/timegm.m4 (gl_FUNC_TIMEGM): Assume timegm is declared if and only
+	if it exists. Don't clobber ac_cv_func_timegm.
+
 2010-04-03  Bruno Haible  <bruno@clisp.org>
 
 	time_r: Fix C++ test error on mingw.
diff --git a/m4/timegm.m4 b/m4/timegm.m4
--- a/m4/timegm.m4
+++ b/m4/timegm.m4
@@ -1,4 +1,4 @@
-# timegm.m4 serial 6
+# timegm.m4 serial 7
 dnl Copyright (C) 2003, 2007, 2009, 2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -8,18 +8,18 @@
 [
   AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
   AC_REQUIRE([gl_FUNC_MKTIME])
+  REPLACE_TIMEGM=0
   if test $ac_cv_func_working_mktime = no; then
     # Assume that timegm is buggy if mktime is.
-    AC_LIBOBJ([timegm])
-    ac_cv_func_timegm=no
+    REPLACE_TIMEGM=1
   else
-    AC_REPLACE_FUNCS([timegm])
-  fi
-  REPLACE_TIMEGM=1
-  if test $ac_cv_func_timegm = yes; then
-    AC_CHECK_DECLS([timegm], [REPLACE_TIMEGM=0], [], [#include <time.h>])
+    AC_CHECK_FUNCS([timegm])
+    if test $ac_cv_func_timegm != yes; then
+      REPLACE_TIMEGM=1
+    fi
   fi
   if test $REPLACE_TIMEGM = 1; then
+    AC_LIBOBJ([timegm])
     gl_PREREQ_TIMEGM
   fi
 ])