X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fctype.m4;h=1641b3e957cc22c13d51b3cdfe423d18adf20d21;hb=062cad2d07081f9a60adbb90fc1184a435a1a93f;hp=b25c62b3fde3cdb30b0c59b5608512931093cadb;hpb=d1a73882fc992d3184bec3a4ccd57b52d95a7458;p=gnulib.git

diff --git a/m4/ctype.m4 b/m4/ctype.m4
index b25c62b3f..1641b3e95 100644
--- a/m4/ctype.m4
+++ b/m4/ctype.m4
@@ -1,5 +1,5 @@
-# ctype_h.m4 serial 2
-dnl Copyright (C) 2009 Free Software Foundation, Inc.
+# ctype_h.m4 serial 4
+dnl Copyright (C) 2009-2010 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.
@@ -7,9 +7,14 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_CTYPE_H],
 [
   AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
-  dnl Execute this unconditionally, because CTYPE_H may be set by other
-  dnl modules, after this code is executed.
+
+  dnl <ctype.h> is always overridden, because of GNULIB_POSIXCHECK.
   gl_CHECK_NEXT_HEADERS([ctype.h])
+
+  dnl Check for declarations of anything we want to poison if the
+  dnl corresponding gnulib module is not in use.
+  gl_WARN_ON_USE_PREPARE([[#include <ctype.h>
+    ]], [isblank])
 ])
 
 AC_DEFUN([gl_CTYPE_MODULE_INDICATOR],