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

[Daniel Colascione]

On 3/17/21 3:47 AM, Damien wrote:

> So I just tested again, with recompiling with `--with-nativecompilation` and I 
> have the exact same behavior. So maybe it is not linked to the compilation 
> branch then. I'll try to reproduce it this weekend on master and maybe bisect 
> it.

The following program freezes in Emacs -Q on current master. To repro, 
start with emacs -Q bad-cc-mode.cpp and scroll down

> "Andrea Corallo" akrl@sdf.org – 16 mars 2021 16:35
> > 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

bad-cc-mode.cpp
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