[PATCH] Map filename from print in gfortran with -ffile-prefix-map (PR96069)

[Thomas Koenig]

Hi Yichao,

> Forwarding to fortran@gcc.gnu.org as suggested by Dominique d'Humieres.
> 
> On Sun, Jul 5, 2020 at 9:29 PM Yichao Yu <yyc1992@gmail.com> wrote:
>>
>>> I think this remapping should happen with `file-prefix-map` but
>>> shouldn't with `debug-prefix-map` (though if it happens for both it's
>>> also not too bad) and I believe this patch is the minimum change to
>>> achieve that. I think it makes sense to make this follow
>>> `macro-prefix-map` although I'm not sure if this is a macro... (OTOH,
>>> __builtin_FILE isn't a macro either so maybe it's fine?). I haven't
>>> figured out how I can allow the option in gfortran or how to document
>>> this new behavior though (e.g. I actually don't know what this is
>>> called in fortran...)

I am not sure that -fmacro-prefix-map is the right name here.
The file names recorded in the Fortran source file are not macros,
so I think that -ffile-prefix-maps makes sense, -fmacro-prefix-map
does not.

Best regards

	Thomas