[Bug preprocessor/118700] Include resolution changes when using -isystem and some headers are symlinks between directories where one is a prefix of the other

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118700

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So I think this is by design. But there is not much documentation on it though.