Macro to give option to preprocessor depending on the compiler ?

[Sébastien Le Roux]

Hello everyone,

I have prepared a 'configure.ac' which tests both for Fortran compilers 
and MPI library.
If configure is done using '--with-mpi' option then the configure looks 
for MPI libs
and if succeed ad the option '-DMPI' for the compilation of some files 
(F90) of the code.
So far everything fines except that I have noticed that some compilers 
(IBMs: mpxlf90/mpxlf95)
do not allows such command. For these compilers you need to tell first 
to the preprocessor
that you are defining a variable using '-WF,-DMPI' the only command 
'-DMPI' won't work.
I wonder if there is a macro to find the good way to tell this to the 
preprocessor, if needed, and
so I guess, depending on the Fortran compiler ?

I do not know all Fortran compilers, but if IBM compilers are the only 
one having this issue
I can only add an option in the IBM cases ...

Thanks for your advises.

--
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Dr. Sébastien Le Roux
Department of Physics
203 Dow Science
Central Michigan University
Mt. Pleasant, MI 48859, USA
E-mail:  address@hidden
Webpage: http://www.phy.cmich.edu/people/lerou1s/
Fax:   +1 (989) 774 2697
Phone: +1 (989) 774 3180
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