Re: Finalizing 'inhibit-automatic-native-compilation'

[Stephen Leake]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Stephen Leake <stephen_leake@stephe-leake.org>
>> Cc: emacs-devel@gnu.org,  Andrea Corallo <akrl@sdf.org>,  Lars Ingebrigtsen
>>  <larsi@gnus.org>,  Stefan Monnier <monnier@iro.umontreal.ca>,  Rob
>>  Browning <rlb@defaultvalue.org>
>> Date: Fri, 27 Jan 2023 15:11:18 -0800
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > Here are the questions I think we want to be answered to finalize the
>> > implementation and effects of 'inhibit-automatic-native-compilation':
>> >
>> >   . Do people actually use 'inhibit-automatic-native-compilation' or
>> >     the corresponding environment variable?  If so, for what reasons,
>> >     and why tweaking 'native-comp-eln-load-path' to direct the *.eln
>> >     files to some other place, including the temporary-file directory,
>> >     was not enough?
>> 
>> I do.
>> 
>> When running Emacs ada-mode tests, I spawn lots of Emacsen. If each one
>> tries to native compile stuff, it just slows down the tests.
>> 
>> I could try to ensure the stuff is native compiled first, but that's a
>> maintenance burden.
>
> Disabling async native-compilation was supported before we introduced
> this variable (via native-comp-deferred-compilation) and will continue
> being supported, for several valid reasons.  Removing that capability
> is not on the table.

Ok, good.

> I understand that if inhibiting native-compilation would still produce
> trampolines in the rare cases where they are needed, it will not do
> any significant harm to your use case, is that right?

Right.

>> >   . What do we want to do about compiling trampolines when
>> >     native-compilation is disabled?
>> 
>> What is the name of the "temporary directory" that is not deleted on
>> Windows? I can check it see if is created when I run my tests.
>
> It's the system temporary directory, the one that's the value of
> temporary-file-directory.  And it isn't the directory that is not
> deleted, it's the comp-lambda-*.eln files (and maybe also *.eln files
> under different names, like *--trampoline-*.eln) in that directory.

On Windows: c:/Users/Stephe/AppData/Local/Temp

No *.eln files there, so apparently I'm not doing anything that requires
trampolines.

-- 
-- Stephe