macos 11 with llvm 14 broken

[lczech]

macos 11 with llvm 14 broken

[aminya]

It seems to me that the reason it is broken is because of LTO. Not sure what we can do to fix that old LLVM.

[lczech]

Not sure that I understand. It seemed to me that this is due to a setup of two conflicting versions of LLVM. How would LTO introduce this error?

[aminya]

Because in LTO, the linker strictly requires matching MacOS target versions. If you build without LTO, it warns, but it will succeed in building.

[lczech]

Ah I see, thanks for the explanation! Isn't that something that would be fixed by having matching target versions though? Is that something that could be done here in setup-cpp? I'd like to keep LTO activated if possible, and not have to introduce an exception for certain OS/compiler combinations :-)

[aminya]

Those specific binaries that LLVM provided are built with that target version. I'll see if there's a solution other than building from the source

[lczech]

Ah now it makes sense that you said

Not sure what we can do to fix that old LLVM.

before :-D Thanks for being patient with me, now I get it!

No worries, if that's too much hassle, I don't think it's the most important thing to fix. I have now simply excluded OSX11 + LLVM14 from my GitHub Actions workflow, which is okay. Any user that happens to want to use exactly those two will then have to deal with it somehow ;-)

Feel free to close the issue if this requires more than just a quick version fix!