Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI wrt direction flag

Aurelien Jarno
2008-03-05T21:46:17Z

Richard Guenther a écrit :
> On Wed, Mar 5, 2008 at 10:20 PM, Joe Buck <Joe.Buck@synopsys.com> wrote:
>>
>> On Wed, 5 Mar 2008, Jan Hubicka wrote:
>> > > Linux kernel is disabling red zone and use kernel code model, yet the
>> > > ABI is not going to be adjusted for that.
>> > >
>> > > This is resonably easy to fix on kernel side in signal handling, or by
>> > > removing std usage completely
>>
>> On Wed, Mar 05, 2008 at 10:02:07PM +0100, Michael Matz wrote:
>> > That is true. But it requires updating the kernel to a fixed one if you
>> > want to run your programs compiled by 4.3 :-/ Not something we'd like to
>> > demand.
>>
>> I changed the title just for emphasis.
>>
>> I think that we can't ship 4.3.0 if signal handlers on x86/x86_64
>> platforms for both Linux and BSD systems will mysteriously (to the users)
>> fail, and it doesn't matter whose fault it is.
>
> We didn't yet run into this issue and build openSUSE with 4.3 since more than
> three month.
>

The problem can be easily reproduced by using a glibc built with gcc
4.3, with SBCL (the gcc version doesn't matter). The signal handler in
SBCL calls sigemptyset() which uses memset().

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