Merge GDB 7.5.1

gdb/gnulib/import/m4/wchar_t.m4

Index: gdb/gnulib/import/m4/wchar_t.m4
diff --git a/gdb/gnulib/m4/wchar_t.m4 b/gdb/gnulib/import/m4/wchar_t.m4
similarity index 62%
rename from gdb/gnulib/m4/wchar_t.m4
rename to gdb/gnulib/import/m4/wchar_t.m4
index 1b572e3c5557bb723dd2b0c05345225e675acd4f..534735d8c6313f6dde9ab17dd5e3a320ca30a741 100644
--- a/gdb/gnulib/m4/wchar_t.m4
+++ b/gdb/gnulib/import/m4/wchar_t.m4
@@ -1,5 +1,5 @@
-# wchar_t.m4 serial 3 (gettext-0.18)
-dnl Copyright (C) 2002-2003, 2008-2011 Free Software Foundation, Inc.
+# wchar_t.m4 serial 4 (gettext-0.18.2)
+dnl Copyright (C) 2002-2003, 2008-2012 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.
@@ -11,9 +11,13 @@ dnl Prerequisite: AC_PROG_CC
 AC_DEFUN([gt_TYPE_WCHAR_T],
 [
   AC_CACHE_CHECK([for wchar_t], [gt_cv_c_wchar_t],
-    [AC_TRY_COMPILE([#include <stddef.h>
-       wchar_t foo = (wchar_t)'\0';], ,
-       [gt_cv_c_wchar_t=yes], [gt_cv_c_wchar_t=no])])
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[#include <stddef.h>
+            wchar_t foo = (wchar_t)'\0';]],
+          [[]])],
+       [gt_cv_c_wchar_t=yes],
+       [gt_cv_c_wchar_t=no])])
   if test $gt_cv_c_wchar_t = yes; then
     AC_DEFINE([HAVE_WCHAR_T], [1], [Define if you have the 'wchar_t' type.])
   fi