X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fiswblank.m4;h=b73649706b85d5f09c68a064de44fb3c601a627e;hb=5191b3546cfb6c163228c23f214e325ddf60d46f;hp=8f15f40e45492e8920ecdba656f51e36423ff843;hpb=f196c56b40c000e32eb88317390dc5f3df632b37;p=gnulib.git

diff --git a/m4/iswblank.m4 b/m4/iswblank.m4
index 8f15f40e4..b73649706 100644
--- a/m4/iswblank.m4
+++ b/m4/iswblank.m4
@@ -1,5 +1,5 @@
-# iswblank.m4 serial 1
-dnl Copyright (C) 2011 Free Software Foundation, Inc.
+# iswblank.m4 serial 4
+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.
@@ -8,8 +8,20 @@ AC_DEFUN([gl_FUNC_ISWBLANK],
 [
   AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
   AC_REQUIRE([gl_WCTYPE_H])
+  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
@@ -22,7 +34,7 @@ AC_DEFUN([gl_FUNC_ISWBLANK],
   else
     if test $HAVE_ISWBLANK = 0 || test $REPLACE_ISWBLANK = 1; then
       dnl Redefine only iswblank.
-      AC_LIBOBJ([iswblank])
+      :
     fi
   fi