getarg and iargc in gcc-4.0.2

[Dr. Germund Hojer]

Your program compiles correctly both with g77(gcc-3.4.4) and gfortran  
(gcc-4.0.2). The gfortran executable is twice the size. Output is the  
same. Changing iargc for command_argument_count and getarg for  
get_command_argument the program works under gfortran but not under g77.  
In the GAMESS code, iargc and getarg work, when compiled with gcc (C code)  
and g77 (Fortran code) and linked with g77. All with gcc-3.4.4 and  
earlier. The same code compiled and linked with gcc and gfortran  
(gcc-4.0.2) give the same error in the linking stage with "undefined  
reference to .." both for the iargc/getarg and the  
command_argument_count/get_command_argument combinations.
The C code in GAMESS refers to the parallel execution control, while the  
Fortran code refers to the computational chemistry part, which is the main  
part.

Best regards

On Mon, 05 Dec 2005 16:41:55 -0600, Paul Thomas <paulthomas2@wanadoo.fr>  
wrote:

> Germund,
>
> The following works with gfortran
>
> [prt@localhost svn]# cat demo.f90
> program test_arg
>   character(80) :: buffer
>   narg = iargc ()
>   print *, "no. of args = ", narg
>   do i = 1, narg
>     call getarg (i, buffer)
>     print *, buffer
>   end do
> end program test_arg
>
> [prt@localhost svn]# ./a.out my arg your arg
>  no. of args =            4
>  my
>  arg
>  your
>  arg
>
> Whilst not standard (as using -std=f95 will demonstrate), this is a  
> fairly common manifestation of argument reading in fortran.
>
> Regards
>
> Paul Thomas
>



-- 
Dr. Germund Hojer
Depto. Fisica y Quimica Teorica
Facultad de Quimica
UNAM
germund.hojer@servidor.unam.mx