From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-410719-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 9185 invoked by alias); 26 Dec 2012 02:45:40 -0000
Received: (qmail 9132 invoked by uid 48); 26 Dec 2012 02:45:25 -0000
From: "guojiufu at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/55810] New: pedantic-errors can not show message for redefined macros in system_header
Date: Wed, 26 Dec 2012 02:45:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: guojiufu at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-55810-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2012-12/txt/msg02327.txt.bz2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55810

             Bug #: 55810
           Summary: pedantic-errors can not show message for redefined
                    macros in system_header
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: guojiufu@gmail.com


Referenced from Bug 16358 and 55602.  If there is "#pragma GCC
system_header",  it silently overwrites the previous defined macro.
-pedantic-errors can not help.  
--a.h --
#pragma GCC system_header
#define A 1
#define A 2
-----a.c----
#include "a.h"

int main(){
  return A;
}
------------
gcc a.c -pedantic-errors