[Bug c++/104142] [9/10/11/12 Regression] Spurios warning unused-variable on const static variable and defaulted constructor

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104142

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It isn't clear what exactly is the regression.
We warn on b with -Wunused-variable since
r9-412-gb46b715d5b838d9869f89d3594ebf7d0b7cb374c
A and B aren't the same, one has explicit defaulted ctor, the other has
implicit ctor.
-Wunused-const-variable warns about a and not b since its introduction in
r6-3283-g0f876f22887f239cedca64ff170b71e5f1daaf54