Consistently thread extra target constraints around (#2829)

This allows for selecting non-default toolchains where the exec triple
matches the target triple.

This is tested by enabling the musl static linking tests on the Linux
host platform. Before this PR, the test would fail because the -gnu
rather than -musl rust toolchain would end up getting selected. Now,
everything works.

Fixes #2726
4 files changed
tree: 4222535195cbcfe864b0bf409513514999005289
  1. .bazelci/
  2. .bcr/
  3. .github/
  4. bindgen/
  5. cargo/
  6. crate_universe/
  7. docs/
  8. examples/
  9. ffi/
  10. nix/
  11. proto/
  12. rust/
  13. test/
  14. tools/
  15. util/
  16. wasm_bindgen/
  17. .bazelignore
  18. .bazelrc
  19. .clang-format
  20. .envrc
  21. .gitattributes
  22. .gitignore
  23. .prettierrc.toml
  24. .rustfmt.toml
  25. ARCHITECTURE.md
  26. AUTHORS
  27. BUILD.bazel
  28. CODEOWNERS
  29. COMPATIBILITY.md
  30. CONTRIBUTING.md
  31. CONTRIBUTORS
  32. LICENSE.txt
  33. MODULE.bazel
  34. README.md
  35. version.bzl
  36. WORKSPACE.bazel
README.md

Rust Rules

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This repository provides rules for building Rust projects with Bazel.

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