X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=m4%2Fstrndup.m4;h=b3567d89812fb75e7315274453940f177aa9d571;hb=HEAD;hp=4fa7d5a7c9356c170a8af76dce4ccfad95aacf7f;hpb=1cbc63c39aad83f1a7963b1a2e5b14e982cea180;p=tar

diff --git a/m4/strndup.m4 b/m4/strndup.m4
index 4fa7d5a..b3567d8 100644
--- a/m4/strndup.m4
+++ b/m4/strndup.m4
@@ -1,5 +1,5 @@
-# strndup.m4 serial 16
-dnl Copyright (C) 2002-2003, 2005-2009 Free Software Foundation, Inc.
+# strndup.m4 serial 18
+dnl Copyright (C) 2002-2003, 2005-2010 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.
@@ -9,17 +9,20 @@ AC_DEFUN([gl_FUNC_STRNDUP],
   dnl Persuade glibc <string.h> to declare strndup().
   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>
-			 #include <stdlib.h>]], [[
+  if test $ac_cv_func_strndup = yes; then
+    # 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>]], [[
 #ifndef HAVE_DECL_STRNDUP
   extern char *strndup (const char *, size_t);
 #endif
@@ -28,26 +31,23 @@ AC_DEFUN([gl_FUNC_STRNDUP],
   free (s);
   s = strndup ("shorter string", 13);
   return s[13] != '\0';]])],
-       [gl_cv_func_strndup=yes],
-       [gl_cv_func_strndup=no],
-       [AC_CHECK_FUNC([strndup],
-          [AC_EGREP_CPP([too risky], [
-#ifdef _AIX
-               too risky
-#endif
-             ],
-             [gl_cv_func_strndup=no],
-             [gl_cv_func_strndup=yes])],
-          [gl_cv_func_strndup=no])])])
-  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
+        AC_LIBOBJ([strndup])
+        ;;
+    esac
   else
-    HAVE_STRNDUP=0
     AC_LIBOBJ([strndup])
-    gl_PREREQ_STRNDUP
   fi
 ])
-
-# Prerequisites of lib/strndup.c.
-AC_DEFUN([gl_PREREQ_STRNDUP], [:])