Re: c-stack and Irix - libsigsegv

[Tom G. Christensen]

On Sun, Sep 21, 2008 at 04:03:54PM +0200, Bruno Haible wrote:
> Hi Eric,
> 
> > Here's the minimal patch needed to CVS libsigsegv to expose the bug, as
> > well as work around it for Irix 5.3.
> 
> Nice work! I'm applying this only slightly modified version.
>   - In the configuration test, keep room to both sides of the ss_sp value.
>     On IRIX, we don't want the test to crash. We want it to exit(1) 
> reasonably.
>   - When setting the stack_t in a reversed way, since we don't know exactly
>     how the fields are interpreted, don't pass an odd address and reduce the
>     size a bit. (Hope that still works!)
> 
> I've put up a new tarball
> at http://www.haible.de/bruno/gnu/libsigsegv-2.7-pre1.tar.gz
> 
I grabbed this and tried to build it on Irix 5.3, 6.2 & 6.5(.30m).
All 3 platforms report:
checking for correct stack_t interpretation... no

The snapshot also fails to build on all 3 platforms.
This is from Irix 6.2:
make[2]: Entering directory `/usr/people/tgc/libsigsegv-2.7-pre1/src'
/bin/ksh ../libtool --tag=CC   --mode=compile cc -DHAVE_CONFIG_H -I. -I.. -I. 
-I.    -g -c -o handler.lo handler.c
libtool: compile:  cc -DHAVE_CONFIG_H -I. -I.. -I. -I. -g -c handler.c -o 
handler.o
cc-3316 cc: ERROR File = handler-unix.c, Line = 490
  The expression must be a pointer to a complete object type.

      ss.ss_sp = extra_stack + extra_stack_size - sizeof (void *);
                 ^

1 error detected in the compilation of "handler.c".
make[2]: *** [handler.lo] Error 1
make[2]: Leaving directory `/usr/people/tgc/libsigsegv-2.7-pre1/src'

It fails similarly on Irix 5.3 & 6.5.

-tgc