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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/98590] [11 regression] Bootstrap failure with Ada on
 Cygwin since switch to C++11
Date: Fri, 08 Jan 2021 10:42:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98590

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> I'm here with Richard, by using -std=3Dc++11 for stage1 we get (at least =
to
> some extent) verification that we aren't relying on GNU extensions and can
> use other host compilers.  Of course, further stages should just use
> whatever g++ defaults to.

In my experience this particular extent is very limited.  If you want to use
other host compilers, then regularly test them, but do not penalize the GNU
project because of them.=