Bug in g2c.h for calling Fortran vom C++ (not C)

[Peter Englmaier]

Hi,

I used C++ to call FORTRAN and it worked fine until I upgraded to
Redhat 7.2 from Redhat 6.2. As explained in the g77 manual, I used the
g2c.h header to call the fortran subroutines from C and C++:

#ifdef __cplusplus
extern "C" {
#endif

#include <g2c.h>
void f77open_dmp(int *,int *,char *,float *, ftnlen);

#ifdef __cplusplus
}
#endif

This worked fine with older Versions of both C and C++, but with the
new version gcc 2.96 (included in Redhat 7.2) as well as gcc 3.0.1 (also
included in Redhat 7.2) it stopped working with C++. Apparently, some 
internal variables are no longer pre-defined, namely: 
__g77_integer, __g77_uinteger, __g77_longint, __g77_ulongint. 
As a workaround I now define those types myself and it compiles OK.

Please let me know, if this is (i) a gcc bug which will is/will be
fixed with more recent versions), or (ii) a bug from Redhat. In the
later case I will report the bug to Redhat as well.

Best Wishes,

Peter Englmaier.



-- 
Dr. Peter Englmaier,              | email: ppe@mpe.mpg.de
MPI f. extraterrestrische Physik, | phone: +49 (89) 30000-3288
Postfach 1312,                    | fax:   +49 (89) 30000-3601
D-85741 Garching, Germany         | web:   http://www.mpe.mpg.de/~ppe/