Re: [ANNOUNCEMENT] Updated for 32-bit, new for 64-bit: libsigsegv-2.10-2

[Corinna Vinschen <corinna-cygwin at cygwin dot com>]

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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