[Bug other/118223] Improve autodependency generation to avoid full product build

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118223

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
-MP is what you want.

See
https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Preprocessor-Options.html#index-MP
 which even explains the usage:
These dummy rules work around errors make gives if you remove header files
without updating the Makefile to match.