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Re: [REQUEST] g77 & fortran dependencies
On Fri, Jan 05, 2001 at 10:26:07PM +0100, Toon Moene wrote:
> Art Haas wrote:
>
> > Over on the gcc-patches mailing list there have been a number of recent
> > patches dealing with the preprocessor and C/C++ dependencies. I'd like to
> > suggest that, if possible, a change be made to handle `INCLUDE' statements
> > in fortran code so that g77 could provide similiar dependency information.
> > At present, this sort of dependency info can only be obtained if the
> > C-like `#include' statements.
>
> Note that currently, the preprocessor for C/C++ is *integrated* with the
> frontend - it isn't a separate program anymore. Hence, its features
> *cannot* be transported to the preprocessing of Fortran source, because
> g77 uses "tradcpp", which is a very old version of the original GNU C
> preprocessor.
>
> The reason for this difference is that the implementors of the
> integrated C/C++ preprocessor weren't able to write one that correctly
> preserved Fortran syntax while preprocessing.
All that you say is true, but I'd like to point out that the
dependency generator is independent of the rest of the C preprocessor.
Java, for example, uses it directly. It shouldn't be too hard to hook
it into Fortran as well.
I don't remember if tradcpp knows about -M, but if it does, you'd need
to be careful that it and g77 didn't trip over each other.
zw