-# wmemcmp.m4 serial 1
+# wmemcmp.m4 serial 3
dnl Copyright (C) 2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
AC_DEFUN([gl_FUNC_WMEMCMP],
[
AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
- AC_CHECK_FUNCS_ONCE([wmemcmp])
- if test $ac_cv_func_wmemcmp = 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 wmemcmp], [gl_cv_func_wmemcmp],
+ [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 ! wmemcmp ((const wchar_t *) 0, (const wchar_t *) 0, 0);]])
+ ],
+ [gl_cv_func_wmemcmp=yes],
+ [gl_cv_func_wmemcmp=no])
+ ])
+ if test $gl_cv_func_wmemcmp = no; then
HAVE_WMEMCMP=0
- AC_LIBOBJ([wmemcmp])
fi
])