[Bug c++/110323] [11/12/13/14 Regression] Code for explicit instantiation of template method of template class not generated

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110323

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
VAL is constexpr, which implies const, which in the global scope implies
static.  Then constrain_visibility_for_template makes "struct conditional<(B ==
VAL), int, float>" non-TREE_PUBLIC.  So with

  extern constexpr int VAL = 1;

the test works again.