From: Tim Prince <n8tm@aol.com>
To: "Vardhan, Sundara (GE Infra, Energy)" <sundara.vardhan@ge.com>
Cc: gcc-help@gcc.gnu.org
Subject: Re: Using Optimization flag in Fortran
Date: Tue, 01 Dec 2009 13:53:00 -0000 [thread overview]
Message-ID: <4B151FC0.6050609@aol.com> (raw)
In-Reply-To: <8E460D1B58F94945A20AA70D4D41430D0BE3CEE2@ALPMLVEM08.e2k.ad.ge.com>
Vardhan, Sundara (GE Infra, Energy) wrote:
> Recently I added the -O3 flag to compile gfortran code. The application
> uses OPEN() call to open files. These calls are made in a sequence, one
> after another to open about 4 files before any operation on any of these
> files are performed. This code works fine when compiled with no
> Optimization flags. However upon adding the Optimization flags (be it -O
> or -O3), the first OPEN() works fine and the next OPEN() call fails. I
> suspect that the optimization flag turns on some check which may be
> causing this failure.
It looks more likely you have a bug in your program whose ill effect is
worsened with optimization. Perhaps you could find it by setting -O
along with -Wall and subscript range checking.
It may also be useful to assure that you have a more stable version of
gfortran than would be furnished by some of the "enterprise" linux distros.
next prev parent reply other threads:[~2009-12-01 13:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-01 13:25 Vardhan, Sundara (GE Infra, Energy)
2009-12-01 13:53 ` Tim Prince [this message]
2009-12-01 15:04 ` Vardhan, Sundara (GE Infra, Energy)
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