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

Thomas Bächler thomas at archlinux.org
Mon May 10 06:45:09 EDT 2010

Am 05.05.2010 00:23, schrieb Thomas Bächler:
> I noticed problem with gcc 4.5 and the GAP system
> (http://www.gap-system.org) first: It throws a few aliasing warnings,
> and the program breaks. When I used -fno-strict-aliasing, the warnings
> disappeared, but the breakage remained, unless I used -O0. Fixing the
> aliasing problems also fixed the breakage.
> Now I noticed the exact same issue with busybox:
> - Building with -Os throws lots of aliasing warnings, busybox's sed breaks
> - Building with -Os -fno-strict-aliasing builds without warnings, but it
> still breaks.
> - Building with -O0 works, but it isn't optimal.
> This will affect LOTS of other programs and these errors will not show
> up as errors or warnings during the build procedure.

I am now building busybox with -O0 again, as '-Os -fno-strict-aliasing
-fno-tree-pta' seemed to work at first, but it turned out the 'sed'
output from busybox was just a few unreadable characters. I tested -O0
and it fixes the problems, but the binary is way too large.

Btw, why do I always get signoffs, then move it, and only then get these

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