With SAGE_CHECK=yes it does indeed seem to build a broken gcc:

...
checking for long long... yes
checking size of long long... configure: error: in `/Users/jberwald/
src/sage-5.0.beta3-gcc/spkg/build/gcc-4.6.2/gcc-build/gcc':
configure: error: cannot compute sizeof (long long)
See `config.log' for more details.
make[2]: *** [configure-stage1-gcc] Error 77
make[1]: *** [stage1-bubble] Error 2
make: *** [all] Error 2

real    0m18.379s
user    0m12.491s
sys     0m5.427s
************************************************************************
Error installing package gcc-4.6.2
************************************************************************

On Feb 15, 3:16 am, Jeroen Demeyer <jdeme...@cage.ugent.be> wrote:
> On 2012-02-14 23:24, entropy wrote:
>
> > woohoo! Success as well using
>
> > $ CC=clang CXX=clang++ MAKE="make -j1" ./sage -f spkg/standard/
> > gcc-4.6.2.spkg
>
> > Successfully installed gcc-4.6.2
> > Now cleaning up tmp files.
> > Finished installing gcc-4.6.2.spkg  (!!)
>
> Could you do the same with SAGE_CHECK=yes please, maybe clang builds a
> *broken* gcc.

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