[Bug preprocessor/61918] With -isystem, symlinks are sometimes processed incorrectly

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61918

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I suspect -fno-canonical-system-headers fixes the behavior to what you think it
should be.