Debug info on macOS

[Gerd Möllmann]

David Malcolm <dmalcolm@redhat.com> writes:

> As I understand it, Emacs is using libgccjit to do ahead-of-time
> compilation, presumably compiling the optimized ELisp code to machine
> code as a shared library.

Correct.

> Is Emacs using gcc_jit_context_compile_to_file with
> GCC_JIT_OUTPUT_KIND_DYNAMIC_LIBRARY, or is it doing something more
> complicated?

Yes. (Sorry, I forgot to CC Andrea; he sent me here :-)).

> If that's what it's doing, you might want to take a look
> at playback::context::compile in gcc/jit-playback.cc (and try stepping
> through it in the debugger).  In particular, the
> playback::compile_to_file::postprocess implementation of the
> playback::context::postprocess vfunc is responsible for taking a .s in
> a tempdir and turning it into the desired output.  Perhaps there's some
> macOS-specific special-casing needed there?
>
> You might also find it useful to look at the overview of how
> libgccjit's internals here:
> https://gcc.gnu.org/onlinedocs/jit/internals/index.html#overview-of-code-structure
>
> Hope this is helpful

Yes it is. Thanks, David!