Add libsemigroups v3.4.0

[jfjameslee]

New package: libsemigroups C++ library for semigroups and monoids.

• Version: 3.4.0
• Source: https://github.com/libsemigroups/libsemigroups/releases/tag/v3.4.0
• Builds the shared library libsemigroups
• Disables HPCombi on non-x86_64 (requires AVX)
• Tested locally

[jfjameslee]

@james-d-mitchell @jswent

[jfjameslee]

NB: Libsemigroups version 3.5.0 was released two days ago. I will get the CI pipeline passing for 3.4 first 👍

[jswent]

@josh-dev-things I think the macos x86-64 is failing because its minimum deployment target is 10.10, whereas libc++ gates std::visit to >= 10.14.

The easiest way to solve this is to just force the deployment target, something like:

if [[ "${target}" == x86_64-apple-darwin* ]]; then
    export MACOSX_DEPLOYMENT_TARGET=10.14
fi

EDIT: you might need to set CFLAGS, CXXFLAGS, and LDFLAGS to match the minimum macosx version as well

[fingolfin]

Just to mention, we are also building libsemigroups as part of /GAP_pkg/GAP_pkg_semigroups/build_tarballs.jl (just in case it contains anything useful for you)

[jswent]

powerpc one is a quick fix, not sure what happened with the macos x86 build

caused by: RequestError: HTTP/2 302 (Operation too slow. Less than 1 bytes/sec transferred the last 20 seconds) while requesting https://us-east.pkg.julialang.org/registry/23338594-aafe-5451-b93e-139f81909106/fc36095514bf775d0c5c44b8d51f85d310fca2dd

could just be a one-off, we'll see the next time it builds.

[jswent]

@jfjameslee this is great, thanks!

[imciner2]

Just to mention, we are also building libsemigroups as part of /GAP_pkg/GAP_pkg_semigroups/build_tarballs.jl (just in case it contains anything useful for you)

@fingolfin is there any scope to unify/consolidate things between the two builds, or is GAP specialized enough that it needs to keep its own copy of the library?

[lgoettgens]

Just to mention, we are also building libsemigroups as part of /GAP_pkg/GAP_pkg_semigroups/build_tarballs.jl (just in case it contains anything useful for you)

@fingolfin is there any scope to unify/consolidate things between the two builds, or is GAP specialized enough that it needs to keep its own copy of the library?

Once this here is merged, we (@fingolfin and I) will experiment in how far it is possible to make use of it in GAP_pkg_semigroups. In theory, it should be easily possible (see https://github.com/semigroups/Semigroups/blob/c35452110aefa91d0dfefad105fc056b3a2b6d75/README.md?plain=1#L76-80), but whether cross-compilation with all of Yggdrasil's targets actually works is hard to tell before attempting it.

[imciner2]

Great. Looks good to me now. @jswent, anymore comments or is this good to merge?