Re: `exec shield' test in configure too strict?

[Jan D.]

Richard Stallman wrote

>     Currently we run temacs like this
>     % setarch i386 ./temacs ...
>
> What about running temacs this way whenever setarch exists?
> If the makefile checks for the existence of setarch just before
> it runs temacs, or tries first to run it using setarch and then
> tries without setarch as a fallback, that would also do the job.
> After all, running temacs has to be done on the actual target
> platform, and then setarch ought to be available if it is needed.

Yes, it would work to first run with setarch and then normally as a fallback.

> Another idea: can `main' contain code to move its heap address to the
> desired place, at startup?

No, as the desired place is not a mapped memory region, you can not write 
there.  But we could do as described by Camm Maguire, check if the heap is not 
at the correct place at temacs startup, and if it is not, call 
personality(LINUX32) and exec() temacs again.

I think this is the best, because then temacs can output some message that 
directs the user to etc/PROBLEMS if the heap address is still off at the second 
run.

        Jan D.