[Bug c++/126868] -ftrivial-auto-var-init=uninitialized should be incompatible with -std=c++26 (or at least warn about it)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126868

--- Comment #1 from Giuseppe D'Angelo <peppe at gcc dot gnu.org> ---
To add: I've just realized that the -ftrivial-auto-var-init option may also be
specified in the source code using a `#pragma GCC optimize` directive, as it's
an optimization option. However I don't think this changes things; a
warning/error could also be emitted there.