[Bug libstdc++/86590] Codegen is poor when passing std::string by value with _GLIBCXX_EXTERN_TEMPLATE undefined

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86590

--- Comment #32 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Jan 21 11:55:52 2019
New Revision: 268112

URL: https://gcc.gnu.org/viewcvs?rev=268112&root=gcc&view=rev
Log:
        PR libstdc++/86590
        * include/bits/char_traits.h (__constant_string_p,
        __constant_char_array_p): Use __builtin_is_constant_evaluated if
        available.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/char_traits.h