[Bug fortran/88190] compile_options.allow_std does not allow to distinguish between GFC_STD_GNU and GFC_STD_LEGACY

[kargl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88190

--- Comment #9 from kargl at gcc dot gnu.org ---
(In reply to Dominique d'Humieres from comment #8)

> 
> Comments welcomed!
>

What problem are you trying to solve?

By default, gfortran tries to compile anything that
is given to her.  Removing GFC_STD_LEGACY from the
default setting is simply wrong.  The fact that you
need to change a number if-conditions from
GFC_STD_GNU to (GFC_STD_GNU | GFC_STD_LEGACY) is 
a clear indication that there is no clear definition
of what the two macros mean.