From ca8a119779daa99fcc00f5ce130d7b614bf27800 Mon Sep 17 00:00:00 2001
From: Jim Meyering <jim@meyering.net>
Date: Sun, 25 Jun 2000 08:48:58 +0000
Subject: Include stdio.h before wchar.h to work around Linux header bug when
 _XOPEN_SOURCE is defined to 500.

---
 m4/mbstate_t.m4 | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'm4/mbstate_t.m4')

diff --git a/m4/mbstate_t.m4 b/m4/mbstate_t.m4
index 4cbbfd5b8..aca2df347 100644
--- a/m4/mbstate_t.m4
+++ b/m4/mbstate_t.m4
@@ -1,4 +1,4 @@
-# serial 1
+# serial 2
 
 # From Paul Eggert.
 
@@ -6,9 +6,14 @@
 # so you can't declare an object of that type.
 # Check for this incompatibility with Standard C.
 
+# Include stdio.h first, because otherwise this test would fail on Linux
+# (at least 2.2.16) because the `_XOPEN_SOURCE 500' definition elicits
+# a syntax error in wchar.h due to the use of undefined __int32_t.
+
 AC_DEFUN(AC_MBSTATE_T_OBJECT,
   [AC_CACHE_CHECK([for mbstate_t object type], ac_cv_type_mbstate_t_object,
-    [AC_TRY_COMPILE([#include <wchar.h>],
+    [AC_TRY_COMPILE([#include <stdio.h>
+#include <wchar.h>],
       [mbstate_t x; return sizeof x;],
       ac_cv_type_mbstate_t_object=yes,
       ac_cv_type_mbstate_t_object=no)])
-- 
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