Hi! On Sat, 16 Jul 2011 11:27:46 -0400, Diego Novillo <dnovi...@google.com> wrote: > On Sat, Jul 16, 2011 at 02:52, Ian Lance Taylor <i...@google.com> wrote: > > > 2011-07-15 Ian Lance Taylor <i...@google.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. For reference, have you measured the > difference in bootstrap time? Clearly, it will be slower, but how > much?
I can provide some data from my GNU/Hurd regression and comparing to
GNU/Linux testing.
This is GCC Git master branch, going from
7c9f953a01d23c6b6885dc908d5b1dba8009efd4 (2011-07-18; ``before'') to
18540031a8b2070a56f5b7e94d6b24e8bd335c57 (2011-07-20; ``after''); which
is shortly before and after the switch to using g++. For GNU/Hurd, I
have applied a few patches that are minor to this experiment.
kepler is a Xen domU on a AMD Athlon II X2 215 with 2700 MHz, the domU
has 1 GiB of RAM, and is running Debian GNU/Linux testing x86.
coulomb is a AMD Athlon XP with 1466 MHz, has 1 GiB of RAM, and is
running Debian GNU/Hurd unstable x86.
kepler coulomb
before 2 h 35 min 10 h 50 min
after 3 h 00 min 13 h 00 min
The ``after'' data is averaged from two iterations only, ``before'' data
has seen many more iterations, and has (roughly) been constant over a
long period of time. Both systems have been idle apart from the GCC
build. The build was essentially a native ``configure && make''.
So, yes, bootstrap is slower now. The bootstrap time now is 16 % to 20 %
longer, roughly.
Grüße,
Thomas
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