[ANNOUNCEMENT] Updated for 32-bit, new for 64-bit: libsigsegv-2.10-2
Corinna Vinschen
corinna-cygwin@cygwin.com
Mon Jul 20 19:02:00 GMT 2015
On Jul 20 12:19, Eric Blake wrote:
> On 07/18/2015 02:11 PM, Corinna Vinschen wrote:
>
> >> m4 was
> >> originally creating an alternate stack of 16k in size, based on a pure
> >> guess that it would be large enough (since the headers didn't declare
> >> any constant otherwise); but cygwin's sigaltstack() requires an
> >> alternate stack of 64k or larger.
> >
> > No, 32K (MINSIGSTKSZ) is sufficient.
> >
> >> I see a couple of options:
> >>
> >> 1. see if we can relax cygwin.dll to live with a 16k alternate stack
> >
>
> > So, what about MINSIGSTKSZ == 8192 and SIGSTKSZ == 32768?
> >
> > Or MINSIGSTKSZ == 16384 and SIGSTKSZ == 65536?
> >
> > That could go into Cygwin 2.2.0 which I could release next week.
>
> I just tested: m4-1.4.17-1 (which uses the 16k alt-stack, compared to
> 1.4.17-2 using 64k) coupled with the test cygwin 2.2.0-0.1 is once again
> able to make use of libsigsegv-2.10-2. And if I recompile m4 against
> cygwin 2.2.0-0.1 headers, I end up with a 32k stack which also works.
>
> That means that so far, I have not found any problems with your new
> smaller stack sizing requirements.
Thanks for testing. That's a good start.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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