FYI: preproc vs. compiler in CHECK_HEADER

[Akim Demaille]

Index: ChangeLog
from  +2003-02-20  Akim Demaille  <address@hidden>

        * lib/autoconf/headers.m4 (_AC_CHECK_HEADER_MONGREL): When
        compiler says yeah, but preproc says nope, compiler is right.
        Conversely, prompt the reader to send a bug report to the
        maintainers of the package, not of Autoconf.

Index: lib/autoconf/headers.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/lib/autoconf/headers.m4,v
retrieving revision 1.29
diff -u -u -r1.29 headers.m4
--- lib/autoconf/headers.m4 27 Oct 2002 18:23:14 -0000 1.29
+++ lib/autoconf/headers.m4 20 Feb 2003 17:14:09 -0000
@@ -1,7 +1,7 @@
 # This file is part of Autoconf.                       -*- Autoconf -*-
 # Checking for headers.
 #
-# Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
+# Copyright (C) 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -124,18 +124,18 @@
 case $ac_header_compiler:$ac_header_preproc in
   yes:no )
     AC_MSG_WARN([$1: accepted by the compiler, rejected by the preprocessor!])
-    AC_MSG_WARN([$1: proceeding with the preprocessor's result])
-    (
-      AS_BOX([Report this to address@hidden)
-    ) |
-      sed "s/^/$as_me: WARNING:     /" >&2
+    AC_MSG_WARN([$1: proceeding with the compiler's result])
+    ac_header_preproc=yes
     ;;
   no:yes )
     AC_MSG_WARN([$1: present but cannot be compiled])
     AC_MSG_WARN([$1: check for missing prerequisite headers?])
     AC_MSG_WARN([$1: proceeding with the preprocessor's result])
+    AC_MSG_WARN([$1: in the future, the compiler will take precedence])
     (
-      AS_BOX([Report this to address@hidden)
+      AS_BOX([Report this to ]m4_ifset([AC_PACKAGE_BUGREPORT],
+                                       [AC_PACKAGE_BUGREPORT],
+                                       [the AC_PACKAGE_NAME lists]))
     ) |
       sed "s/^/$as_me: WARNING:     /" >&2
     ;;