[Bug c++/120498] error: either all initializer clauses should be designated or none of them should be when designated-initialising nested union members(?) (same code accepted as C)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120498

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
.sa_handler is not a real member of the struct, it's a macro referring to a
nested member. 

So you can't use designated initializers with that type in C++.