Optimization options

[Ignacio Fernández Galván]

Hi all,

I'm compiling a program (Gaussian 98) which gives problems (probably
numerical inaccuracies) with -O1. I tried to find out which
optimization flag was the responsible, but when I manually add all
options implied by -O1 (according to the manual), it works fine.

Since I'm using a daily binary build of gfortran (4.3.0 20070130), I
checked what it seems the appropriate manual:
<http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html>. Well, first
it complained that two options (-fsplit-wide-types and -ftree-lrs)
don't exist, and then I got the above behaviour (-O1 seems to turn on
something else).

Is there a way to check with options are turned on when compiling?
Where can I found a current list of optimization options for gfortran?
Could this be a problem whith mixing the gcc version in my system
(4.1.1 20060724) and the daily gfortran build?

Thanks
Ignacio


		
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