[arch-dev-public] [toolchain] gcc 4.5 breakage

Thomas Bächler thomas at archlinux.org
Thu May 6 03:44:24 EDT 2010

Am 05.05.2010 02:46, schrieb Allan McRae:
> Interesting...  Does fixing the aliasing fix this one too? I see no
> upstream bug reports that seem related so you should follow it up there.
>  I will pull in a new gcc-4.5 snapshot next week when I do the
> glibc-2.12 toolchain rebuild so hopefully that may contain a fix that I
> am missing...

There is no fix in the latest 4.5 branch (or trunk) yet.
http://gcc.gnu.org/PR43987 has more details.

Basically, the problem is caused by -ftree-fta, which is on by default
with -O1 and higher (and also -Os, which I use for busybox). The bug can
be worked around with -fno-tree-fta until a fix becomes available.

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