[overture] Re: gfortran and using -O3
- From: Caroline Yates <CYates@xxxxxxx>
- To: "overture@xxxxxxxxxxxxx" <overture@xxxxxxxxxxxxx>, "Kyle Chand (chand1@xxxxxxxx)" <chand1@xxxxxxxx>
- Date: Tue, 24 Jan 2012 13:19:18 +0000
Hi Kyle,
Thank you very much, this helped us a lot.
I have just another question about gfortran v4.4.6, namely we downloaded the
package for RHEL6 and it comes configured with:
../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap
--enable-shared --enable-threads=posix --enable-checking=release
--with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions
--enable-gnu-unique-object
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk
--disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre
--enable-libgcj-multifile --enable-java-maintainer-mode
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib
--with-ppl --with-cloog --with-tune=generic --with-arch_32=i686
--build=x86_64-redhat-linux
The person I am working with is experiencing odd issues with gfortran and I was
wondering if you recommend that we rebuild from source, and if so, are there
any flags you would suggest?
Thanks again for all your help!
Kind regards,
Caroline
-----Original Message-----
From: overture-bounce@xxxxxxxxxxxxx [mailto:overture-bounce@xxxxxxxxxxxxx] On
Behalf Of Kyle K. Chand
Sent: 18 January 2012 17:22
To: overture@xxxxxxxxxxxxx
Subject: [overture] Re: gfortran and using -O3
Hi Caroline,
You can try
make FC_FLAGS_OPT=-O2 compile=opt
when building CG.
Regards,
Kyle
mailto: chand1@xxxxxxxx
phoneto: (925) 422 7740
On Jan 18, 2012, at 7:22 AM, Caroline Yates wrote:
> Can anyone advise how to change the gfortran flag -O3 to use -O2. I
> can't seem to locate where this option is being set.
> We are running into segmentation faults using gfortran v4.4.6 while
> trying to build CG v24. On an individual .f file compilation we are
> getting better results compiling with -O2.
>
> Any suggestions would be most appreciated, thanks!
> Kind regards,
> Caroline
>
> ______________________________________________________________________
>
> Caroline Yates
> Unix Contractor
> Schlumberger Cambridge Research
> High Cross, Madingley Road, Cambridge, CB3 0EL
> Tel: +44 1223 325246
> Mob: +44 7971 226334
> ______________________________________________________________________
>
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