bug#47191: 28.0.50; Native compilation branch freeze in cc-mode

[Andrea Corallo via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Damien <dam@cosinux.org> writes:

> Using the native compilation branch, Create tmp.cpp with this:
>
> ```
> // In state_machine
> private: auto
> state_machine::stop_bbbbbbb(states::recording &&s,
> aaaaaa::bbbbbbb_stopped_reason reason)
> -> fsm::state_machine<
> aaaaaa::bbbbbbb::state_machine,
> std::variant<aaaaa::bbbb::cccccc::ddddddd::eeeeee::aaaaaa_connected,
> aaaaa::bbbb::cccccc::ddddddd::eeeeee::aaaaaa_disconnected,
> aaaaa::bbbb::cccccc::ddddddd::eeeeee::aaaaaa_state,
> aaaaa::bbbb::cccccc::ddddddd::eeeeee::aaaaaa_info,
> aaaaa::bbbb::cccccc::ddddddd::eeeeee::aaaaaa_battery,
> aaaaa::bbbb::cccccc::ddddddd::eeeeee::account_error,
> aaaaa::bbbb::cccccc::ddddddd::eeeeee::account_valid>,
> std::variant<aaaaa::bbbb::aaaaaa::bbbbbbb::states::init>>::state
> ```
>
> Open using `emacs -Q tmp.cpp` and emacs freezes.

I've just compiled f3abb17118 but I can't reproduce this.

I'm seeing you are compiling with '--with-nativecomp', we have changed
the flag into '--with-nativecompilation' (yeah sorry) so native
compilation is disable on your build (should be also listed in
"Configured features:" if enabled).

Rebuilding f3abb17118 without enabling native compilation I still can't
reproduce this :(

Thanks

  Andrea