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

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: 46256@debbugs.gnu.org, andrewjmoreton@gmail.com
> Date: Sat, 06 Mar 2021 18:30:05 +0000
> 
> >> This file ELNFILENAME_libgccjit_repro.c can be just compiled linking
> >> against libgccjit to obtain the reproducer.
> >
> > "To obtain the reproducer" meaning that the compiled and linked
> > program should crash in the same way is Emacs does?  I thought we
> > crash while compiling the file and linking it to produce a shared
> > library, not while running it.  Right?
> 
> Yes, the compiled program when executed will replay the same compilation
> attempted by Emacs and therefore if is a libgccjit fault it should
> crash.
> 
> Does the reproducer crash when executed on your system?

Yes, it does.

> > More generally, what is the relation between the contents of the
> > reproducer file and the source the native compilation sees when we
> > call gcc_jit_context_compile_to_file?  Do we submit a similar file to
> > GCC or something?
> 
> The reproducer file is a file that is meant to recreate the same
> libgccjit IR and attempt a compilation with that.  In practice it calls
> the same functions we call at the interface with libgccjit describing
> the code we want to compile and attempt to perform a compilation.

But any issues caused by actually writing the reproducer to a disk
file, like text-mode conversions and quirks, aren't relevant, right?