Re: mixed language help needed

[Toon Moene <toon at moene dot indiv dot nluug dot nl>]

Juan Nastri wrote:

> I am writing a new main for an old program written in fortran and I am
> looking for a light somewhere.
> The general idea is to use the old fortran subroutines, and make the new
> main in plain C.
> I have read a lot of pages, speaking about mixed language, and a lot of
> different things where suggested.

Note that, until the full (upcoming) Fortran 200x Standard is completed,
you'll *have* to delve into the manual accompanying your Fortran
compiler to learn how this is done - *for this specific compiler* -
because it is compiler specific.

> But what I need is quite simple.  I need a concrete example on how to
> link a subroutine.f with a main_program.c.
> Lets say, that the subroutine uses 2 integer as a parameters.
> Exactly what should I tell to gcc and g77 to correctly compile this??
> and example of a makefile would be usefull too!

main.c:

main(){int i,j;(void)subroutine(&i,&j);printf("%d %d\n",i,j);}

subroutine.f:

      SUBROUTINE SUBROUTINE(I,J)
      I = 1; J = 2
      END

compile & link:

g77 -fno-underscoring main.c subroutine.f
./a.out
1 2

> 
> Thank you at least to read this.  If you can help me, I would be very
> happy.

Well, I hope you can indicate to us where the g77 manual failed to make
this clear to you ...

-- 
Toon Moene - mailto:toon@moene.indiv.nluug.nl - phoneto: +31 346 214290
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