[compiler-rt] [compiler-rt] Initial support for builtins on GPU targets (PR #95304)

[Saleem Abdulrasool via llvm-commits]

compnerd wrote:

> @compnerd is there a canonical way to build for multiple architectures at the same time? I.e. given a standard CMake invocation I'd like to be able to build output for x64, amdgcn, and nvptx64 if they are all supported by the compiler.

Invoke CMake multiple times :) CMake is designed to build for a single host at a time, so you would need to run a build per host.

https://github.com/llvm/llvm-project/pull/95304