Allow setting RUSTFLAGS from SDK #693
Description
Checklist
- I agree to follow the Code of Conduct that this project adheres to.
- I have searched the issue tracker for a feature request that matches the one I want to file, without success.
Suggestion
See https://gitlab.com/freedesktop-sdk/freedesktop-sdk/-/merge_requests/14244
RUSTFLAGS should be inherited from SDK and passed when building.
We should have rustflags and rustflags-override: true|false for it.