I agree with most of your post, but I think MKL is Fortran and C/C++, and implements the BLAS API. I recall that BLAS has a Fortran interface and a CBLAS (C, no

I agree with most of your post, but I think MKL is Fortran and C/C++, and implements the BLAS API. I recall that BLAS has a Fortran interface and a CBLAS (C, not C++) interface, and I used the latter. And Rust can call out to C ABI code.