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generalize 'forbidden feature' concept so that even (un)stable feature can be invalid to toggle

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Also rename some things for extra clarity
This commit is contained in:
Ralf Jung
2024-11-16 10:00:16 +01:00
parent 1f3bf231e1
commit 2d887a5c5c
13 changed files with 468 additions and 401 deletions
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11
compiler/rustc_codegen_gcc/src/lib.rs
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@@ -260,8 +260,8 @@ impl CodegenBackend for GccCodegenBackend {
.join(sess)
}
fn target_features(&self, sess: &Session, allow_unstable: bool) -> Vec<Symbol> {
target_features(sess, allow_unstable, &self.target_info)
fn target_features_cfg(&self, sess: &Session, allow_unstable: bool) -> Vec<Symbol> {
target_features_cfg(sess, allow_unstable, &self.target_info)
}
}
@@ -472,7 +472,8 @@ fn to_gcc_opt_level(optlevel: Option<OptLevel>) -> OptimizationLevel {
}
}
pub fn target_features(
/// Returns the features that should be set in `cfg(target_feature)`.
fn target_features_cfg(
sess: &Session,
allow_unstable: bool,
target_info: &LockedTargetInfo,
@@ -481,9 +482,9 @@ pub fn target_features(
sess.target
.rust_target_features()
.iter()
.filter(|(_, gate, _)| gate.is_supported())
.filter(|(_, gate, _)| gate.in_cfg())
.filter_map(|&(feature, gate, _)| {
if sess.is_nightly_build() || allow_unstable || gate.is_stable() {
if sess.is_nightly_build() || allow_unstable || gate.requires_nightly().is_none() {
Some(feature)
} else {
None