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Re: Re: Cygwin PostgreSQL CVS Patch Question

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 (view raw or flat)
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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