On Wed, 04 Jul 2012 17:08:30 +0200 Dimitry Andric <dim_at_FreeBSD.org> wrote: > On 2012-07-04 16:33, Taku YAMAMOTO wrote: > > For people having SIGBUS with clang-build world + gcc-build binaries, > > > > > > In short words, for any libraries (and never forget about rtld-elf!) > > which are potentially called from arbitrary binaries, > > compile them with either -mstackrealign or -mstack-alignment=8! > > > > The detail is as follows. > > > > I've observed that clang carelessly expects the stack being aligned at > > 16 byte boundary. > > Eh, this is a requirement of the amd64 ABI. Any compiler that *doesn't* > align the stack on 16-byte boundaries is basically broken. Or are you > experiencing this on i386? Even there, 16-byte alignment would be much > better in combination with SSE instructions (which arent' enabled by > default, btw). Oops, I had to be clear about that! Yes, the experiment was took on i386 (actually -march=pentium4). > Note that you would get the same issue with newer versions of gcc, which > will also assume this alignment. Interesting, but the base gcc we currently have won't on i386, I think. (I occationally get bitten by similar problem when using -ftree-vectorize) -- -|-__ YAMAMOTO, Taku | __ < <taku_at_tackymt.homeip.net> - A chicken is an egg's way of producing more eggs. -Received on Wed Jul 04 2012 - 13:32:00 UTC
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