How to link with OpenMP?

[kornelski]

OpenMP is special in that it requires -fopenmp to be passed to the linker (-lopenmp won't work).

cc.flag('-fopenmp') is passed only to the compiler, but not the linker. AFAIK cargo doesn't allow arbitrary linker flags.

Is is possible to use OpenMP with build scripts/cargo?

[kornelski]

OK, got it:

            println!("cargo:rustc-link-lib=gomp"); // static needs gcc_eh too

~/.cargo/config

[target.x86_64-apple-darwin]
linker = "gcc-7"