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

[Jakub Jelinek]

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.

	Jakub