From: | Jason Tishler <Jason(dot)Tishler(at)dothill(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Peter Eisentraut <peter_e(at)gmx(dot)net>, pgsql-ports(at)postgresql(dot)org |
Subject: | Re: Re: Cygwin PostgreSQL CVS Patch Question |
Date: | 2001-01-10 01:54:41 |
Message-ID: | 20010109205441.D1364@dothill.com |
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Thread: | |
Lists: | pgsql-ports |
Tom,
On Tue, Jan 09, 2001 at 06:37:31PM -0500, Tom Lane wrote:
> Jason Tishler <Jason(dot)Tishler(at)dothill(dot)com> writes:
> > extern int sys_nerr;
> > int main() {
> > int x = sys_nerr;
> > ; return 0; }
>
> > The problem is gcc -O2 is being too smart, optimizing away the reference
> > to sys_nerr.
>
> Oh, that's nasty. Try a test program like so:
>
> extern int sys_nerr;
> int my_nerr;
> int main() {
> my_nerr = sys_nerr;
> return 0; }
>
> I don't think gcc will try to optimize away an assignment to a global
> variable.
You are correct -- the above program fails as expected.
Are you going to change config/c-library.m4 to generate the above
program instead?
Thanks,
Jason
--
Jason Tishler
Director, Software Engineering Phone: +1 (732) 264-8770 x235
Dot Hill Systems Corp. Fax: +1 (732) 264-8798
82 Bethany Road, Suite 7 Email: Jason(dot)Tishler(at)dothill(dot)com
Hazlet, NJ 07730 USA WWW: http://www.dothill.com
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