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Bug#333766: libc6: SIGBUS in libm on hppa breaks qt-x11-free

On Thu, Oct 13, 2005 at 05:04:55PM -0700, Steve Langasek wrote:
> To say that this is a compiler bug, you would have to show that gcc-4.0 is
> *wrong* to 32-bit align the fenv_t struct instead of 64-bit aligning it.
> You'd have to check with the compiler folks to be sure, but I don't think
> this is a correct assertion for a struct of 32-bit unsigned ints.

If it wants to use fldd (floating point load double) it must be 8-byte
aligned, otherwise it will take an unaligned access trap. I believe I
added code to the kernel recently that will let someone toggle on and
off unaligned access traps/logging with "prctl"... Might be worth checking.

> At any rate, knowing that gcc-3.4 does this alignment differently gives us a
> viable workaround for qt; since qt is already building with g++-3.4 on hppa
> (et al.), it's no trouble to also make it build-depend on and use gcc-3.4.


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