From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-427730-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 19446 invoked by alias); 12 Aug 2013 16:24:28 -0000
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
Received: (qmail 19222 invoked by uid 48); 12 Aug 2013 16:24:25 -0000
From: "sbergman at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58138] New: #include <random> gives warning: macro "__code_model_small__" is not used
Date: Mon, 12 Aug 2013 16:24:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 4.9.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: sbergman at redhat 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-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter
Message-ID: <bug-58138-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2013-08/txt/msg00654.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58138

            Bug ID: 58138
           Summary: #include <random> gives warning: macro
                    "__code_model_small__" is not used
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sbergman at redhat dot com

At least with a trunk revision 201654 (aka LATEST-4.9) build (on Fedora 18
x86_64):

> $ cat test1.cc
> #include <random>
> namespace {}

> $ ~/gcc/LATEST-4.9/inst/bin/g++ -std=gnu++11 -Wunused-macros -c test1.cc
> test1.cc:2:12: warning: macro "__code_model_small__" is not used [-Wunused-macros]
>  namespace {}
>             ^

I was able to strip that down to the following excerpt of
~/gcc/LATEST-4.9/inst/lib/gcc/x86_64-unknown-linux-gnu/4.9.0/include/ia32intrin.h:

> $ cat test2.cc
> #include "test2.h"
> namespace {}

> $ cat test2.h
> #pragma GCC system_header
> #pragma GCC push_options
> #pragma GCC target("sse4.2")
> #pragma GCC pop_options

> $ ~/gcc/LATEST-4.9/inst/bin/g++ -Wunused-macros -c test2.cc test2.cc:2:12: warning: macro "__code_model_small__" is not used [-Wunused-macros]
>  namespace {}
>             ^

With a build of tags/gcc_4_8_1_release, compiling test1.cc does not give a
warning while test2.cc does.  And with a random old build of
branches/gcc-4_6-branch, compiling neither test1.cc nor test2.cc gives a
warning (replacing -std=gnu++11 with -std=gnu++0x when compiling test1.cc).