access to include path in front end

[James K. Lowden]

On Wed, 30 Nov 2022 08:49:35 +0100
Richard Biener <richard.guenther@gmail.com> wrote:

> > I would like to use the -I option to pass the names of copybook
> > directories to the cobol front end.  A bit of exploration yesterday
> > left me with the sense that the -I argument, in C at least, is not
> > passed to the compiler, but to the preprocessor. Access to
> > -fmax-errors I think I've figured out, but -I is a mystery.
> 
> The frontends have access to the set of passed options via the
> option processing langhooks (and there's also global_options
> and global_options_set), -I would be the OPT_I option (currently
> only enabled for some frontends, you can add that in your
> language specific .opt file).  The set of include directories is
> not in any way special here.

Thanks for clearing that up for me, Richard.  I somehow got the
impression that the langhooks were needed only for adding options
specific to the language.  

--jkl