clang makes segfaulting code with -march=core2 on i386

[Dimitry Andric]

On 14 Sep 2014, at 19:27, Dimitry Andric <dim at FreeBSD.org> wrote:
...
> In any case, I have now narrowed it down to gcc/tree.c, which is not a
> very small file, and which is changed very often upstream, sometimes
> almost daily.
> 
> So I will see if I can reproduce it with gcc trunk first, and if that
> turns out to be good, I will bisect to find the commit that fixes it.
> 
> If trunk is also not good, the rabbit hole goes a bit deeper...

And deeper it goes: gcc trunk does not crash, *unless* I change the file
gcc/DEV-PHASE to contain the string "prerelease" instead of the default
"experimental".  Then gcc trunk crashes in an identical fashion to the
gcc 4.8 branch, or gcc 4.8.2 release!

Anybody have an idea what kind of magic in gcc is changed, when this
DEV-PHASE file is altered?  Some debug code or internal assertion
checking might be turned on or off?

-Dimitry

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