Build CI on macos-latest

[Coloquinte]

Highs doesn't build using Github CI on macos-latest (see complete log).

The error is ld: library not found for -lomp, which seems related to this stackoverflow thread, where the proposed solution is to provide the full path for libomp.dynlib.

I have no idea how to make this work transparently when installing the crate, but it would be nice to have.

[lovasoa]

Yes, that would be nice to have indeed! Can you make a pull request?

[jajhall]

HiGHS doesn't need OpenMP - and hasn't for 2-3 years

[lovasoa]

Wow, then we should probably update https://github.com/rust-or/highs-sys/blob/master/build.rs

@jajhall , could you have a look and check whether there are other things we should update there ?

[Coloquinte]

So if we don't need to build with OpenMP at all maybe we can just remove the cargo:rustc-link-lib=dylib=omp option from the highs-sys crate.

At the moment my workaround to build is the same as for highs-sys, using brew link --force libomp

[jajhall]

Wow, then we should probably update https://github.com/rust-or/highs-sys/blob/master/build.rs

@jajhall , could you have a look and check whether there are other things we should update there ?

Could you have a quick look through this please, @galabovaa?

[Coloquinte]

Trying this right now

[Coloquinte]

Great, thanks!