X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fwmemmove.m4;h=0f80d0843052f8acff2418b4634b1410dd9ad2cb;hb=23eecb48e39afd0d267d64d40ba6bf97aa865e13;hp=73884c803b2f9e438f7ccafe3a7dec2133ea7042;hpb=6189b9d73d41c85c37c444b99088b448f164051b;p=gnulib.git

diff --git a/m4/wmemmove.m4 b/m4/wmemmove.m4
index 73884c803..0f80d0843 100644
--- a/m4/wmemmove.m4
+++ b/m4/wmemmove.m4
@@ -1,5 +1,5 @@
-# wmemmove.m4 serial 2
-dnl Copyright (C) 2011 Free Software Foundation, Inc.
+# wmemmove.m4 serial 3
+dnl Copyright (C) 2011-2013 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.
@@ -7,8 +7,26 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_WMEMMOVE],
 [
   AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
-  AC_CHECK_FUNCS_ONCE([wmemmove])
-  if test $ac_cv_func_wmemmove = no; then
+  dnl We cannot use AC_CHECK_FUNCS here, because the MSVC 9 header files
+  dnl provide this function as an inline function definition.
+  AC_CACHE_CHECK([for wmemmove], [gl_cv_func_wmemmove],
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM([[
+/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
+   <wchar.h>.
+   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
+   before <wchar.h>.  */
+#include <stddef.h>
+#include <stdio.h>
+#include <time.h>
+#include <wchar.h>
+]],
+          [[return ! wmemmove ((wchar_t *) 0, (const wchar_t *) 0, 0);]])
+       ],
+       [gl_cv_func_wmemmove=yes],
+       [gl_cv_func_wmemmove=no])
+    ])
+  if test $gl_cv_func_wmemmove = no; then
     HAVE_WMEMMOVE=0
   fi
 ])