Sourced from here.
It inherits the same licence as its parent source.

It was moved to its own repo to simplify its interoperability with the packages system of xmake.
Basically, if your platform has no support for OpenMP (like basic wasm targets), or you just want to disable it for whatever reasons, this is a stub exposing the same minimal interface but with no functionality attached.

Also kind of useful if you want to bootstrap your own implementation for embedded firmware not based on linux.

Example of integration via package file:

package("omp-stub")
    set_homepage("https://github.com/lazy-eggplant/omp-stub")
    set_description("Simple stub for OpenMP, to avoid refactoring code")
    set_license("OpenMP Architecture Review Board")

    add_urls("https://github.com/lazy-eggplant/omp-stub.git")

    on_install(function (package)
        import("package.tools.xmake").install(package)
    end)

    on_test(function (package)
        assert(package:check_cxxsnippets({test = [[
            #include <omp.h>
            void test() { /* use library API */ }
        ]]}, {configs = {languages = "c11"}}))
    end)