[Developers] Not overriding the user's F77 specification

Erik Schnetter schnetter at uni-tuebingen.de
Tue Jan 20 04:53:25 CST 2004

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On Tuesday 20 January 2004 11:36, Jonathan Thornburg wrote:
> On Mon, 19 Jan 2004, Erik Schnetter wrote:
> > I suggest to set F77 to F90 only if the user has not explicitly
> > specified F77.  This is e.g. useful on the Regatta, where one wants
> > to use different Fortran compilers for .f and .f90 files.
> On Mon, 19 Jan 2004, Tom Goodale wrote:
> > If we do that, we should run the symbol name detector on both and
> > stop on an error if the F77 and F90 compilers use different naming
> > schemes.
> Why would we need to stop?  Why not use the F77 mangling when calling
> F77 routines from C/C++ and the F90 mangling when calling F90
> routines from C/C++?  Granted, having F77 call F90 or vice versa
> probably wouldn't work, but being able to get between the C/C++ an
> Fortran "universes" would I think still be useful.  Or am I missing
> something obvious...?

Fortran 90 is a superset of Fortran 77.  Your suggestion is, well, in a 
way similar to using different calling convertions for C and for extern 
"C" routines in C++...  When the Fortan 77 and the Fortran 90 compiler 
use different calling schemes, then they are incompatible.  I don't see 
much point in trying to work around that.

But one important step that we do not take at the moment is checking 
whether the symbol name detector is correct.  For pgf90 and certain 
compiler flags it gets the scheme wrong.  Instead of grepping on the 
executable, it should try to compile and link actual code.

- -erik

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Erik Schnetter <schnetter at aei.mpg.de>   http://www.aei.mpg.de/~eschnett/

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