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Re: [PATCH] Make cstddef / cstdarg more robust (PR 69881)

From: Jonathan Wakely <jwakely at redhat dot com>
To: Jakub Jelinek <jakub at redhat dot com>
Cc: Bernd Edlinger <bernd dot edlinger at hotmail dot de>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>, "libstdc++ at gcc dot gnu dot org" <libstdc++ at gcc dot gnu dot org>
Date: Tue, 23 Feb 2016 10:19:57 +0000
Subject: Re: [PATCH] Make cstddef / cstdarg more robust (PR 69881)
Authentication-results: sourceware.org; auth=none
References: <HE1PR07MB0905BE8B57CCF6328BE2A52FE4A40 at HE1PR07MB0905 dot eurprd07 dot prod dot outlook dot com> <20160223094232 dot GE3171 at redhat dot com> <HE1PR07MB0905DA9EC78E1EB09B0A9F87E4A40 at HE1PR07MB0905 dot eurprd07 dot prod dot outlook dot com> <20160223100912 dot GY3017 at tucnak dot redhat dot com>

On 23/02/16 11:09 +0100, Jakub Jelinek wrote:

On Tue, Feb 23, 2016 at 10:00:58AM +0000, Bernd Edlinger wrote:

Previously the g++ default was --std=gnu++98,
but gcc-6 changed the default to --std=gnu++14.

And when building gcc-4.9, stage1 does not override that with
--std=gnu++98.

That has changed, and that triggers the latent bug.


So just use -std=gnu++98 in STAGE1_CXXFLAGS or configure with
CXX='g++ -std=gnu++98' if you try to build gcc-4.9 with gcc 6?

I really don't think we should work around this in GCC 6.


I agree, but #undefining those macros doesn't hurt, and hopefully the
issue will go away.

References:
- [PATCH] Make cstddef / cstdarg more robust (PR 69881)
  - From: Bernd Edlinger
- Re: [PATCH] Make cstddef / cstdarg more robust (PR 69881)
  - From: Jonathan Wakely
- Re: [PATCH] Make cstddef / cstdarg more robust (PR 69881)
  - From: Bernd Edlinger
- Re: [PATCH] Make cstddef / cstdarg more robust (PR 69881)
  - From: Jakub Jelinek

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