OpenBLAS compilation with `DYNAMIC_ARCH` flag via `openblas-src`?

[bangconghuynh]

I am wondering if it is possible to build OpenBLAS via openblas-src with DYNAMIC_ARCH=1 and perhaps also DYNAMIC_OLDER=1 flags passed to make?

I can see that the struct openblas-build/src/build.rs::Configure does have a field called dynamic_arch, but this field is not utilised at all in Configure::make_args. There is also no mechanism in openblas-src/src/build.rs::build on linux target OS's to set dynamic_arch in Configure::make_args.

I am wondering if this is intentional or simply an omission that can be easily fixed?