X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fobstack-printf.m4;h=ae2e5d9d7d6be36224407c60419db1cb479c5b30;hb=fc80165c92e8b92da6e88e4fdb9c472125124fa0;hp=98860c2e666640761666dbe3589383094be42ac2;hpb=7a8101a246b1c7aa64cd2f95ad2a43a2bf2ee891;p=gnulib.git

diff --git a/m4/obstack-printf.m4 b/m4/obstack-printf.m4
index 98860c2e6..ae2e5d9d7 100644
--- a/m4/obstack-printf.m4
+++ b/m4/obstack-printf.m4
@@ -1,5 +1,5 @@
-# obstack-printf.m4 serial 1
-dnl Copyright (C) 2008 Free Software Foundation, Inc.
+# obstack-printf.m4 serial 2
+dnl Copyright (C) 2008, 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,
 dnl with or without modifications, as long as this notice is preserved.
@@ -10,6 +10,9 @@ dnl obstack_vprintf behaves identically, so we only test for one.
 
 AC_DEFUN([gl_FUNC_OBSTACK_PRINTF],
 [
+  dnl Persuade glibc <stdio.h> to declare obstack_printf(), obstack_vprintf().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
   AC_REQUIRE([gl_STDIO_H_DEFAULTS])
   AC_CHECK_FUNCS_ONCE([obstack_printf])
   if test $ac_cv_func_obstack_printf = no ; then