https://gcc.gnu.org/bugzilla/show_bug.cgi?id=605
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Looks like we only document -YP, is supported and not -Y P; likewise for -Y M,
@item -YP,@var{dirs}
@opindex YP
Search the directories @var{dirs}, and no others, for libraries
specified with @option{-l}.
@item -Ym,@var{dir}
@opindex Ym
Look in the directory @var{dir} to find the M4 preprocessor.
The assembler uses this option.
@c This is supposed to go with a -Yd for predefined M4 macro files, but
@c the generic assembler that comes with Solaris takes just -Ym.
@end table
I don't know how important it is to support this though.
