mrustc: Fails to build for Leopard

[doctashay]

The build fails during linking because it is unable to find unwind symbols. I am not at my main workstation right now so I will upload a build log for this later.

[barracuda156]

@doctashay This is a known issue, but I need to fix something else first before I get to this point on Leopard (ppc64 build is broken earlier).

Upd. I.e., this should be fixed: #55

[Matias314]

Adding libunwind dependency and -lunwind ldflags to the portfile results in consistent mrustc crashes.

[barracuda156]

@Matias314 I wonder if there exists some configuration where it actually works LOL
So far libunwind was known to break a lot of ports on modern systems, turns out it also breaks things even without any conflicting system library.

[doctashay]

I don't know what changed, but the latest upstream builds just fine on Leopard now - so this resolves the linker error. It's bootstrapping rust now but I don't expect it to finish. Still, this is progress.

edit: sorry, didn't read the posts above LOL

[barracuda156]

I don't know what changed, but the latest upstream builds just fine on Leopard now - so this resolves the linker error.

So should we allow builds on 10.5 as-is? (ppc64 gonna still fail.)

It's bootstrapping rust now but I don't expect it to finish

Should fail when trying to run rustc binary. Or earlier.

[doctashay]

It died when linking the standard library against libstd.rlib.

It looks like two categories of missing symbols: libdispatch and libgcc unwinder symbols, which Matias already reported. I would wait to allow builds on 10.5 until we can actually get it running.

[doctashay]

With the dispatch issue, there is a thread parking option that utilizes pthread, so we can just flip that on for <10.5.

As far as libunwind, I don't even think we need it because the unwind symbols it's looking for are already available in libgcc_s.

I made those two fixes and now it reaches step 2 in the portfile which is marked as a fixme. I'm assuming this is how far we are on 10.6 too? What's left for a full Rust bootstrap?

[barracuda156]

@doctashay If you got mrustc installed, just try compiling something. For example, eva port.