Hi! On Sat, 16 Jul 2011 11:27:46 -0400, Diego Novillo wrote: > On Sat, Jul 16, 2011 at 02:52, Ian Lance Taylor wrote: > > > 2011-07-15  Ian Lance Taylor   > > > >        * 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