[Bug c++/123526] [16 Regression] Linking error when using standard exception as base class

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123526

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The reduced testcase should fail to link, that is by design, you are supposed
to provide the ctor of base in another TU.