[Bug middle-end/30250] Evaluate lgamma/gamma at compile-time

[ghazi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=30250

--- Comment #7 from Kaveh Ghazi <ghazi at gcc dot gnu.org> ---
I did the re-entrant functions (like lgamma_r) but I don't recall ever doing
non-thread-safe plain lgamma etc, those that update the global variable
"signgam". It's been a decade, so memory is fuzzy. Anyway I'm not sure if it's
worth it so, no objections to closing this one.