bug#46494: 28.0.50; [native-comp] Problems with async background compile

[Andy Moreton <andrewjmoreton@gmail.com>]

On Sun 07 Mar 2021, Eli Zaretskii wrote:

>> From: Andy Moreton <andrewjmoreton@gmail.com>
>> Date: Sat, 20 Feb 2021 16:40:38 +0000
>> 
>> >> On a x86_64-w64-mingw32 build, sending SIGHUP to a compilation
>> >> subprocess results in the emacs abort dialog being shown briefly and
>> >> then disappearing (without user interaction). That dialog should require
>> >> pressing a button to dismiss it.
>> >
>> > I think if the process dies or exits, the dialog is closed.
>> >
>> > So, since you seem to be able to reproduce this with a simpler setup,
>> > please try these:
>> >
>> >   . repeat the experiment using 'SIGINT and 'SIGBREAK instead of
>> >     'SIGHUP
>> >   . repeat the experiment with w32-start-process-share-console set to
>> >     a non-nil value (both with SIGHUP and the other 2 SIG* signals)
>> >
>> > I'd be interested to know whether the results are different.
>> 
>> Using 'SIGINT or 'SIGBREAK did not seem affect the subprocess at all.
>> 
>> Using "(w32-start-process-share-console t)" with 'SIGHUP seemed to work
>> without triggering the abort dialog, and killing emacs with async
>> processes running also did, not trigger the aborts.
>
> I think I found and fixed the problem which caused these abort dialogs
> to pop up when exiting Emacs while native-compile subprocesses are
> running.  Please try the latest native-comp branch.

From commit 15aa239ba058ef02544e5dfaf066bd985d9b2f4f I tried building
for for i686-w64-mingw32 using "--with-wide-int" and no longer see the
abort dialogs (after a few tests with 4 async compiles running), so I
think this is fixed.

Thanks,

    AndyM