X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fstrnlen.m4;h=a1c59ac644e5e3e1b8c6297ecf8c34250ed1aadc;hb=939dedd9a2fba934e5ff0313155f9f5f39cb6f6f;hp=5838a0d32943e28158a638152452b5fa7c82c91a;hpb=53b8fa05726a7fb30010e42ce02e44a35f0d7489;p=gnulib.git

diff --git a/m4/strnlen.m4 b/m4/strnlen.m4
index 5838a0d32..a1c59ac64 100644
--- a/m4/strnlen.m4
+++ b/m4/strnlen.m4
@@ -1,30 +1,32 @@
-# strnlen.m4 serial 1
-dnl Copyright (C) 2002 Free Software Foundation, Inc.
-dnl This file is free software, distributed under the terms of the GNU
-dnl General Public License.  As a special exception to the GNU General
-dnl Public License, this file may be distributed as part of a program
-dnl that contains a configuration script generated by Autoconf, under
-dnl the same distribution terms as the rest of that program.
+# strnlen.m4 serial 12
+dnl Copyright (C) 2002-2003, 2005-2007, 2009-2011 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.
 
 AC_DEFUN([gl_FUNC_STRNLEN],
 [
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+
   dnl Persuade glibc <string.h> to declare strnlen().
-  AC_REQUIRE([AC_GNU_SOURCE])
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
 
-  AC_FUNC_STRNLEN
-  if test $ac_cv_func_strnlen_working = no; then
-    # This is necessary because automake-1.6.1 doens't understand
-    # that the above use of AC_FUNC_STRNLEN means we may have to use
-    # lib/strnlen.c.
-    #AC_LIBOBJ(strnlen)
+  AC_CHECK_DECLS_ONCE([strnlen])
+  if test $ac_cv_have_decl_strnlen = no; then
+    HAVE_DECL_STRNLEN=0
+  else
+    AC_FUNC_STRNLEN
+    dnl Note: AC_FUNC_STRNLEN does AC_LIBOBJ([strnlen]).
+    if test $ac_cv_func_strnlen_working = no; then
+      REPLACE_STRNLEN=1
+    fi
+  fi
+  if test $HAVE_DECL_STRNLEN = 0 || test $REPLACE_STRNLEN = 1; then
+    AC_LIBOBJ([strnlen])
     gl_PREREQ_STRNLEN
   fi
 ])
 
 # Prerequisites of lib/strnlen.c.
-AC_DEFUN([gl_PREREQ_STRNLEN], [
-  AC_REQUIRE([AC_HEADER_STDC])
-  AC_CHECK_HEADERS_ONCE(memory.h string.h)
-  AC_CHECK_DECLS(memchr)
-])
-
+AC_DEFUN([gl_PREREQ_STRNLEN], [:])