[Bug c/105369] Improved diagnostics for code from statement expressions documentation [C component]

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105369

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I don't think there is a way to get a warning for the abs really and maybe not
even wanted.
There should definitely be a cross reference to where the documentation says
inline functions are fast as macros if there is not already one.