X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fstrndup.m4;h=a1f82743f31811db96c7c8090210f9a8f4799880;hb=51792d2f76e96d017ad9284b60812cfbed4cb618;hp=48b15cc03506a54f144c8e90d9933439fe5af9c5;hpb=1d9734dc428383f0573c39c3ee92d84c78b84436;p=gnulib.git

diff --git a/m4/strndup.m4 b/m4/strndup.m4
index 48b15cc03..a1f82743f 100644
--- a/m4/strndup.m4
+++ b/m4/strndup.m4
@@ -1,49 +1,55 @@
-# strndup.m4 serial 6
-dnl Copyright (C) 2002-2003, 2005-2006 Free Software Foundation, Inc.
+# strndup.m4 serial 21
+dnl Copyright (C) 2002-2003, 2005-2013 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.
 
 AC_DEFUN([gl_FUNC_STRNDUP],
 [
-  AC_LIBSOURCES([strndup.c, strndup.h])
-
   dnl Persuade glibc <string.h> to declare strndup().
-  AC_REQUIRE([AC_GNU_SOURCE])
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
 
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
   AC_CHECK_DECLS_ONCE([strndup])
+  AC_CHECK_FUNCS_ONCE([strndup])
+  if test $ac_cv_have_decl_strndup = no; then
+    HAVE_DECL_STRNDUP=0
+  fi
 
-  # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
-  AC_CACHE_CHECK([for working strndup], gl_cv_func_strndup,
-    [AC_RUN_IFELSE([
-       AC_LANG_PROGRAM([#include <string.h>], [[
-#ifndef HAVE_DECL_STRNDUP
-  extern char *strndup (const char *, size_t);
+  if test $ac_cv_func_strndup = yes; then
+    HAVE_STRNDUP=1
+    # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
+    AC_CACHE_CHECK([for working strndup], [gl_cv_func_strndup_works],
+      [AC_RUN_IFELSE([
+         AC_LANG_PROGRAM([[#include <string.h>
+                           #include <stdlib.h>]], [[
+#if !HAVE_DECL_STRNDUP
+  extern
+  #ifdef __cplusplus
+  "C"
+  #endif
+  char *strndup (const char *, size_t);
 #endif
   char *s;
   s = strndup ("some longer string", 15);
   free (s);
   s = strndup ("shorter string", 13);
   return s[13] != '\0';]])],
-       [gl_cv_func_strndup=yes],
-       [gl_cv_func_strndup=no],
-       [AC_EGREP_CPP([too risky], [
-#ifdef _AIX
-            too risky
-#endif
-          ],
-          [gl_cv_func_strndup=no],
-          [gl_cv_func_strndup=yes])])])
-  if test $gl_cv_func_strndup = yes; then
-    AC_DEFINE([HAVE_STRNDUP], 1,
-      [Define if you have the strndup() function and it works.])
+         [gl_cv_func_strndup_works=yes],
+         [gl_cv_func_strndup_works=no],
+         [
+changequote(,)dnl
+          case $host_os in
+            aix | aix[3-6]*) gl_cv_func_strndup_works="guessing no";;
+            *)               gl_cv_func_strndup_works="guessing yes";;
+          esac
+changequote([,])dnl
+         ])])
+    case $gl_cv_func_strndup_works in
+      *no) REPLACE_STRNDUP=1 ;;
+    esac
   else
-    AC_LIBOBJ([strndup])
-    AC_DEFINE(strndup, rpl_strndup,
-      [Define to rpl_strndup if the replacement function should be used,])
-    gl_PREREQ_STRNDUP
+    HAVE_STRNDUP=0
   fi
 ])
-
-# Prerequisites of lib/strndup.c.
-AC_DEFUN([gl_PREREQ_STRNDUP], [:])