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Date: Wed, 20 Jul 2011 01:15:00 -0000
Message-ID: <CAMe9rOoaCxJxGk-q6hAUq7KkWeP0GvuZH3mHnxHd0uF=bdkoKg@mail.gmail.com>
Subject: Re: PATCH RFA: Build stages 2 and 3 with C++
From: "H.J. Lu" <hjl.tools@gmail.com>
To: Ian Lance Taylor <iant@google.com>
Cc: gcc-patches@gcc.gnu.org, gcc@gcc.gnu.org
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On Tue, Jul 19, 2011 at 5:26 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Tue, Jul 19, 2011 at 11:33 AM, Ian Lance Taylor <iant@google.com> wrot=
e:
>> Ian Lance Taylor <iant@google.com> writes:
>>
>>> I would like to propose this patch as a step toward building gcc using a
>>> C++ compiler. =A0This patch builds stage1 with the C compiler as usual,
>>> and defaults to building stages 2 and 3 with a C++ compiler built during
>>> stage 1. =A0This means that the gcc installed and used by most people w=
ill
>>> be built by a C++ compiler. =A0This will ensure that gcc is fully
>>> buildable with C++, while retaining the ability to bootstrap with only a
>>> C compiler, not a C++ compiler. =A0This will permit us to experiment wi=
th
>>> optionally using C++ for some code, using a #ifdef to select the C
>>> implementation or the C++ implementation.
>>>
>>> I would suggest that we consider releasing 4.7 this way, as a small
>>> trial for building gcc with C++.
>>>
>>> This is a big step, so I am sending the patch to both gcc@ and
>>> gcc-patches@ for comments.
>>>
>>> Bootstrapped and ran testsuite on x86_64-unknown-linux-gnu.
>>>
>>> Ian
>>>
>>>
>>> 2011-07-15 =A0Ian Lance Taylor =A0<iant@google.com>
>>>
>>> =A0 =A0 =A0 * configure.ac: Add --enable-build-poststage1-with-cxx. =A0=
If set,
>>> =A0 =A0 =A0 make C++ a boot_language. =A0Set and substitute
>>> =A0 =A0 =A0 POSTSTAGE1_CONFIGURE_FLAGS.
>>> =A0 =A0 =A0 * Makefile.tpl (POSTSTAGE1_CONFIGURE_FLAGS): New variable.
>>> =A0 =A0 =A0 (STAGE[+id+]_CONFIGURE_FLAGS): Add $(POSTSTAGE1_CONFIGURE_F=
LAGS).
>>> =A0 =A0 =A0 * configure, Makefile.in: Rebuild.
>>
>>
>> I got agreement from two global reviewers and no objections.
>>
>> I have committed this patch.
>>
>> Please let me know about any problems.
>
> It caused:
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D49787

It also caused:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D49786

--=20
H.J.