X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fmemrchr.m4;h=b74de75afad1240d0586611753af83891be5e6bd;hb=6d5b64e8b1a223481ddf2fb18fc4923ed1888a66;hp=06a9b1ee7ec76d1a40ce92f3f084e8e5e54ac88f;hpb=44d7c1c1f004fa9bfb8ec3948de2671a7958cf5b;p=gnulib.git

diff --git a/m4/memrchr.m4 b/m4/memrchr.m4
index 06a9b1ee7..b74de75af 100644
--- a/m4/memrchr.m4
+++ b/m4/memrchr.m4
@@ -1,5 +1,5 @@
-# memrchr.m4 serial 3
-dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+# memrchr.m4 serial 9
+dnl Copyright (C) 2002, 2003, 2005, 2006, 2007, 2009 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.
@@ -7,9 +7,15 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_MEMRCHR],
 [
   dnl Persuade glibc <string.h> to declare memrchr().
-  AC_REQUIRE([AC_GNU_SOURCE])
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
 
-  AC_REPLACE_FUNCS(memrchr)
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_CHECK_DECLS_ONCE([memrchr])
+  if test $ac_cv_have_decl_memrchr = no; then
+    HAVE_DECL_MEMRCHR=0
+  fi
+
+  AC_REPLACE_FUNCS([memrchr])
   if test $ac_cv_func_memrchr = no; then
     gl_PREREQ_MEMRCHR
   fi