Allow CUDA extension builds to skip generating cuda dependencies during compile time (#119936)
nvcc flag `--generate-dependencies-with-compile` doesn't seem to be supported by `sccache` for now. Builds with this flag enabled will not benefit from sccache.
This PR adds an environment variable that allows users to set this flag and skip those nvcc dependencies to speed up their build with compiler caches. If everything is "fresh build" in CI, we don't care if there are unnecessary recompile during incremental builds.
related: https://github.com/pytorch/pytorch/pull/49344
- [ ] todo: raise an issue to sccache
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119936
Approved by: https://github.com/ezyang
