On Sat, Jun 02, 2012 at 10:52:12PM -0400, Michael Mol wrote:
> On Sat, Apr 28, 2012 at 11:07 AM, Michael Mol <mike...@gmail.com> wrote:
> Wow. Just wow. This is incredible.
> 
> This is repeatable for me.
> 
<snip>
>  * The problem occurred while executing the ebuild file named
>  * 'glibc-2.14.1-r3.ebuild' located in the '/var/db/pkg/sys-
> 
<snip>
> CFLAGS="-O2 -pipe -D_FORTIFY_SOURCE=2 -march=core2 -mcx16 -msahf
> --param l1-cache-size=32 --param l1-cache-line-size=64 --param
> l2-cache-size=4096 -mtune=core2 -ggdb3"
> CXXFLAGS="${CFLAGS}"

Can you upgrage to glibc-2.15?
Can you tweak you gcc flags to something more conventional and see if the
problem persists?
If you are interested in submitting a patch to the upstream then you can build
the glibc test suite with your gcc flags and check if the tests pass.

regards, Dmitry

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