[CMake] How to find fortran library

[Javier Gonzalez]

Maik Beckmann wrote:
> Am Mittwoch, 3. Dezember 2008 schrieb Javier Gonzalez:
>   
>> Hi all,
>>
>> I have a project that links to another project built with Fortran. My
>> own project is a C++ project and I usually need to link against a
>> fortran library of some sort to use the first one. I use gcc, so it
>> usually is libgfortran or libg2c.
>>
>> Now my question is: if I enable Fortran, will there be a variable that
>> tells me the location of the library I need to link to?
>>     
>
> No.  The compiler frontend (gfortran, g77, ...) makes the decision which 
> system and compiler libraries have to be linked in.  
>
> If you or cmake link an fortran executable with 
>   g77 -o myapp a.o b.o ..
> libg2c will be linked in by g77.  When doing
>   g77 -o myapp a.o b.o ..
> libgfortran will be linked in by gfortran.
>
> The same is true for g++, which links in libstdc++ by default.
>
>   
>> What I do at the moment is that I guess which library I need to link to
>> based on the Fortran compiler's name and, since I use gcc, try to find
>> it in the path given by 'gcc -print-search-dirs'. Is this the right way?
>> I would expect that cmake defines a variable with this information
>> somewhere.
>>     
>
> This is the right way.  Maybe an effort to write cmake module which handles 
> this task is worthy.
>
> Best,
>  -- Maik
>
>
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>   
I see.

Later I saw Bill's message about the new release. One of the changes in
2.6.3 RC5 is:
- Add FortranCInterface.cmake module to discover Fortran/C interfaces

I wonder if that is precisely what I was looking for so I will check it out.

thanks,
Javier