# HG changeset patch
# User Bruno Haible <bruno@clisp.org>
# Date 1312840181 -7200
# Node ID 3f32114e63976c7aeb0e34552a901a8a7487e0cd
# Parent  5bbc9e0b92755a3251098620dcbb6e1211ef40b5
iswblank: Detect declaration correctly.

* m4/iswblank.m4 (gl_FUNC_ISWBLANK): Use correct headers in
AC_CHECK_DECLS invocation.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2011-08-08  Bruno Haible  <bruno@clisp.org>
+
+	iswblank: Detect declaration correctly.
+	* m4/iswblank.m4 (gl_FUNC_ISWBLANK): Use correct headers in
+	AC_CHECK_DECLS invocation.
+
 2011-08-08  Bruno Haible  <bruno@clisp.org>
 
 	tcgetsid: Detect declaration correctly.
diff --git a/m4/iswblank.m4 b/m4/iswblank.m4
--- a/m4/iswblank.m4
+++ b/m4/iswblank.m4
@@ -1,4 +1,4 @@
-# iswblank.m4 serial 3
+# iswblank.m4 serial 4
 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,
@@ -11,7 +11,17 @@
   dnl Persuade glibc <wctype.h> to declare iswblank().
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
   AC_CHECK_FUNCS_ONCE([iswblank])
-  AC_CHECK_DECLS_ONCE([iswblank])
+  AC_CHECK_DECLS([iswblank], , , [[
+/* 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>
+#include <wctype.h>
+]])
   if test $ac_cv_func_iswblank = no; then
     HAVE_ISWBLANK=0
     if test $ac_cv_have_decl_iswblank = yes; then