translating intel fortran flags to gfortran

[Tobias Burnus]

Tom Roche wrote:
> I'm recompiling code with gfortran that has previously been done (and
> is almost entirely documented) using ifc. I have a general question
> and a specific one:
>
> * Are there useful references for translating ifc flags to gfortran,
>    e.g., a guide to porting?

Not really. Looking at both the ifc/ifort documentation and at the 
gfortran [1] and gcc [2] documentation seems to be the only way.

> * What would be the gfortran equivalent of
>
>> -extend_source 132 -cm -w95 -c

For "-c" use "-c". For "-extend_source 132" use -ffixed-line-length-132.

-w95 and -cm seem to be warning related. You might simply leave them out 
(and ignore the warnings). Or use GCC's "-w" to disable all warnings.

There might be other flags needed such as -std=legacy, depending which 
compile-time errors you get.

Tobias

[1] gfortran: Fortran related flags, see 
http://gcc.gnu.org/onlinedocs/gfortran/Invoking-GNU-Fortran.html
[2] gcc: General optimization- or processor-related flags, see 
http://gcc.gnu.org/onlinedocs/gcc/Invoking-GCC.html