[Bug c/66682] Lots of macro expansion, very slow compilation

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66682

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Note that this code is not really "stand-alone": See
https://gcc.gnu.org/bugs/#need