Re: stackovf: optionally use libsigsegv

Hi Eric,

On 18 Jul 2008, at 05:17, Eric Blake wrote:

> I'm committing this on the stackovf branch.  This completes the  
> original goal I
> had when setting out to create the branch: stack overflow detection  
> in m4 is no
> longer the unsafe portability nightmare it used to be.  If you  
> install the
> optional library libsigsegv, this branch guarantees that on most  
> modern porting
> targets, stack overflow no longer causes a core dump (cygwin, mingw)  
> nor is an
> internal bug misdiagnosed as stack overflow (BSD, Linux, ...) (but  
> we don't
> have any internal bugs, right?).  If you are lucky enough to have a  
> platform
> that does this without libsigsegv (Solaris), more power to you.

Nice work!  More robust *and* more maintainable in one hit!?!

> Next step - figure out how to make the master branch have two  
> simultaneous
> gnulib checkouts (the c-stack, strsignal, and related modules are  
> not needed
> for libm4.a, just the final m4 executable).

A general solution in gnulib-tool?

If not, what is the problem with the current method we use in master?

> Then I can merge this into both branch-1.6 and master.


AFAICT multiple gnulib checkouts is orthogonal to libsigsegv, and it  
would be nice to see this code on the dev branches right away.  We can  
solve other problems separately :)

Cheers,
	Gary
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