skip bundling libLLVM and libjulia-codegen when trimming

[JeffBezanson]

These are the biggest libraries in there, and should be excluded when using --trim or --strip-ir. We could also add a --no-codegen option for those who want to live dangerously.

Why are they required when not using --trim? I understood it that way that without --trim, all possible methods are compiled (which, in my current use case, results in a ~ 450 MB binary instead of 1.8 MB). So, surely no non-compiled method should ever be called. But that seems not to be correct?

As another note, going into a similar direction, I did hit a "ccall requires the compiler" error when adding packages with artifacts, and removing libLLVM and libjulia-codegen, see this discourse post (and follow-ups). However, I did not have the time to systematically test things and pinpoint the problem.

So, for me it is totally unclear how this all relates. Is this

• WIP (so I "just wait and see" 😉)
• a topic of correct usage (and expectations), and thus for documentation
• subject to further investigation and MWEs and issues are welcome
• ... anything else?

[JeffBezanson]

We only try to compile all possible methods if you specify --compile=all. Otherwise the JIT compiler is needed. And even with --compile=all, you will still need the JIT if eval is used.

Ok, thanks. And what is compiled (and what not) if --compile=all is NOT specified? 450 MB still is a lot of compiled code... 😅.
EDIT: The 450 MB I get with the juliac.jl script, so I guess that works differently anyway from this new package (since there is no --compile=all option).

[gbaraldi]

There are some heuristics for what we choose to compile based on what specializations happened during precompilation and precompile statements

[JeffBezanson]

Fixed by 2040fa5

[JeffBezanson]

I'm reopening this because, while the libraries are removed, they are listed in the output as being included and are included in the displayed size, which is misleading.