[Patch, Fortran] PR34079 - BIND(C) and characters - unneeded character length passed

[Tobias Burnus]

:ADDPATCH fortran:

For
   call subroutine("Hello")
gfortran passes two arguments: a pointer to the string and the string
length. For C interoperability the additional argument with the
character length is not needed.

This patch simply does not generate the extra argument(s) when calling a
BIND(C) procedure.

The extra argument is harmless for the standard C calling convention as
the caller pops the stack, however, using STDCALL the called function
has to pop the stack.

STDCALL is used by some 32bit Windows libraries and I don't know how
much this patch will help.
(For STDCALL see -mrdt option in the GCC manual and
http://gcc.gnu.org/ml/fortran/2007-11/msg00074.html )


Build and regression tested on x86-64. OK for the trunk?

Tobias
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