[Bug c++/87372] [9 Regression] __PRETTY_FUNCTION__ not constexpr in gcc trunk on compiler explorer

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87372

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Patch for the original problem posted:
https://gcc.gnu.org/ml/gcc-patches/2018-09/msg01206.html