bug#46256: [feature/native-comp] AOT eln files ignored if run from build tree

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: pipcet@gmail.com, 46256@debbugs.gnu.org, andrewjmoreton@gmail.com
> Date: Sun, 07 Mar 2021 06:57:24 +0000
> 
> > Another idea I had related to this: since there seem to be stability
> > issues with even the recent versions of libgccjit, we should perhaps
> > automatically add a .el file whose native-compilation failed to the
> > list in comp-deferred-compilation-deny-list, so that the same Emacs
> > session won't try native-compilation of the same .el file again.
> > WDYT?
> 
> Sounds good, will do.

Thanks.

> > (Btw, the "deferred" part in the name of the variable sounds redundant
> > to me, since we always compile asynchronously, except during
> > bootstrap, which has a separate variable anyway.)
> 
> Well we expose also `native-compile' to compile synchronously (IIRC
> that's also what package.el does if asked).

I guess I'm confused: what's the difference between native-compile and
the deferred compilation?  I though the deferred compilation just uses
native-compile.  Or is there a different command for that?

> > A data point: subr-x.elc is 16247 bytes, whereas the corresponding
> > .eln file (for 32-bit wide-int architecture) is 90631 bytes, a 5.5
> > factor.
> >
> > If I look at the file with 'size', I get the following numbers:
> >
> >    text    data     bss     dec     hex filename
> >   63951     788   24784   89523   15db3 subr-x-02dfef32-17faeb1d.eln
> 
> What's the size of the corresponding .elc ?

See above: 16247 bytes.