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Implement cfg(target_abi) (RFC 2992)

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Add an `abi` field to `TargetOptions`, defaulting to "". Support using
`cfg(target_abi = "...")` for conditional compilation on that field.

Gated by `feature(cfg_target_abi)`.

Add a test for `target_abi`, and a test for the feature gate.

Add `target_abi` to tidy as a platform-specific cfg.

This does not add an abi to any existing target.
This commit is contained in:
Josh Triplett
2021-07-06 20:54:54 -07:00
parent c0bd5a584d
commit 84d6e8aed3
9 changed files with 76 additions and 1 deletions
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3
compiler/rustc_feature/src/active.rs
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@@ -687,6 +687,9 @@ declare_features! (
/// Allows qualified paths in struct expressions, struct patterns and tuple struct patterns.
(active, more_qualified_paths, "1.54.0", Some(80080), None),
/// Allows `cfg(target_abi = "...")`.
(active, cfg_target_abi, "1.55.0", Some(80970), None),
// -------------------------------------------------------------------------
// feature-group-end: actual feature gates
// -------------------------------------------------------------------------