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Re: PATCH RFA: Build stages 2 and 3 with C++
On Sun, Jul 17, 2011 at 12:57 AM, Ian Lance Taylor <firstname.lastname@example.org> wrote:
> Diego Novillo <email@example.com> writes:
>> On Sat, Jul 16, 2011 at 02:52, Ian Lance Taylor <firstname.lastname@example.org> wrote:
>>> 2011-07-15 ?Ian Lance Taylor ?<email@example.com>
>>> ? ? ? ?* configure.ac: Add --enable-build-poststage1-with-cxx. ?If set,
>>> ? ? ? ?make C++ a boot_language. ?Set and substitute
>>> ? ? ? ?POSTSTAGE1_CONFIGURE_FLAGS.
>>> ? ? ? ?* Makefile.tpl (POSTSTAGE1_CONFIGURE_FLAGS): New variable.
>>> ? ? ? ?(STAGE[+id+]_CONFIGURE_FLAGS): Add $(POSTSTAGE1_CONFIGURE_FLAGS).
>>> ? ? ? ?* configure, Makefile.in: Rebuild.
>> I agree with this change.
I agree with this change as well. It will give us the opportunity to
debugging a C++ built cc1 ...
>> ?For reference, have you measured the
>> difference in bootstrap time? ?Clearly, it will be slower, but how
> I have not measured the change in bootstrap time, no.
I have measured it at some point and IIRC it was about 10% slower
(comparing C bootstrap with C++ in stag1 languages with C++ bootstrap,
not sure if that included bootstrapping libstdc++ for the former).