Bison porting fix for PathScale EKO compiler

[Paul Eggert]

I'm currently working through Nelson H. F. Beebe's build feedback for
Bison 2.1, and installed this patch to fix the first problem I found
that hadn't already been fixed.

2006-02-01  Paul Eggert  <address@hidden>

        * tests/headers.at (AT_TEST_CPP_GUARD_H): Don't assume that "$CC
        -E" works; it apparently doesn't work with PathScale EKO Compiler
        Suite Version 2.0, according to the Nelson H. F. Beebe tests summarized 
in
        <http://lists.gnu.org/archive/html/bug-bison/2005-09/msg00021.html>.

Index: tests/headers.at
===================================================================
RCS file: /cvsroot/bison/bison/tests/headers.at,v
retrieving revision 1.11
diff -p -u -r1.11 headers.at
--- tests/headers.at    14 May 2005 06:49:48 -0000      1.11
+++ tests/headers.at    1 Feb 2006 08:40:20 -0000
@@ -1,5 +1,5 @@
 # Bison Parser Headers.                               -*- Autotest -*-
-# Copyright 2001 Free Software Foundation, Inc.
+# Copyright (C) 2001, 2002, 2006 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
@@ -67,8 +67,7 @@ dummy:;
 
 AT_CHECK([bison --defines=$1.h --output=y.tab.c $1.y])
 
-# CPP should be happy with it.
-AT_CHECK([$CC -E -I. y.tab.c], 0, [ignore])
+AT_COMPILE([y.tab.o], [-c y.tab.c])
 
 AT_CLEANUP
 ])