filename with new compile.el

[Reto Zimmermann <reto@gnu.org>]

Hi,

I would like to ask the author of the new compile.el how filenames are 
obtained when they are not part of the error message, but instead just 
printed out once at the beginning of a compile.  In the old compile.el 
there was variable compilation-file-regexp-alist for this purpose.  From 
the comments for variable compilation-error-regexp-alist it sounds like 
this type of filename parsing is still possible but I can't figure out 
how.  There doesn't seem to be an example for this in the predefined 
regexp settings.

Any hint at how this can be done?  I need this to update vhdl-mode.el.

Thanks,
Reto