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Print all features with --print target-features, including aliases and tied features

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This commit is contained in:
Caleb Zulawski 2022-11-19 21:22:17 -05:00
parent c5d82ed7a4
commit 102a5d867c
1 changed files with 19 additions and 16 deletions
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35
compiler/rustc_codegen_llvm/src/llvm_util.rs
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@ -292,30 +292,33 @@ fn llvm_target_features(tm: &llvm::TargetMachine) -> Vec<(&str, &str)> {
} }
fn print_target_features(sess: &Session, tm: &llvm::TargetMachine) { fn print_target_features(sess: &Session, tm: &llvm::TargetMachine) {
let mut target_features = llvm_target_features(tm); let mut llvm_target_features = llvm_target_features(tm);
let mut known_llvm_target_features = FxHashSet::<&'static str>::default();
let mut rustc_target_features = supported_target_features(sess) let mut rustc_target_features = supported_target_features(sess)
.iter() .iter()
.filter_map(|(feature, _gate)| { .map(|(feature, _gate)| {
for llvm_feature in to_llvm_features(sess, *feature) { let desc = if let Some(llvm_feature) = to_llvm_features(sess, *feature).first() {
// LLVM asserts that these are sorted. LLVM and Rust both use byte comparison for these strings. // LLVM asserts that these are sorted. LLVM and Rust both use byte comparison for these strings.
match target_features.binary_search_by_key(&llvm_feature, |(f, _d)| f).ok().map( match llvm_target_features.binary_search_by_key(&llvm_feature, |(f, _d)| f).ok() {
|index| { Some(index) => {
let (_f, desc) = target_features.remove(index); known_llvm_target_features.insert(llvm_feature);
(*feature, desc) llvm_target_features[index].1
}, }
) { None => "",
Some(v) => return Some(v),
None => {}
} }
} } else {
None ""
};
(*feature, desc)
}) })
.collect::<Vec<_>>(); .collect::<Vec<_>>();
rustc_target_features.extend_from_slice(&[( rustc_target_features.extend_from_slice(&[(
"crt-static", "crt-static",
"Enables C Run-time Libraries to be statically linked", "Enables C Run-time Libraries to be statically linked",
)]); )]);
let max_feature_len = target_features llvm_target_features.retain(|(f, _d)| !known_llvm_target_features.contains(f));
let max_feature_len = llvm_target_features
.iter() .iter()
.chain(rustc_target_features.iter()) .chain(rustc_target_features.iter())
.map(|(feature, _desc)| feature.len()) .map(|(feature, _desc)| feature.len())
@ -327,10 +330,10 @@ fn print_target_features(sess: &Session, tm: &llvm::TargetMachine) {
println!(" {1:0$} - {2}.", max_feature_len, feature, desc); println!(" {1:0$} - {2}.", max_feature_len, feature, desc);
} }
println!("\nCode-generation features supported by LLVM for this target:"); println!("\nCode-generation features supported by LLVM for this target:");
for (feature, desc) in &target_features { for (feature, desc) in &llvm_target_features {
println!(" {1:0$} - {2}.", max_feature_len, feature, desc); println!(" {1:0$} - {2}.", max_feature_len, feature, desc);
} }
if target_features.is_empty() { if llvm_target_features.is_empty() {
println!(" Target features listing is not supported by this LLVM version."); println!(" Target features listing is not supported by this LLVM version.");
} }
println!("\nUse +feature to enable a feature, or -feature to disable it."); println!("\nUse +feature to enable a feature, or -feature to disable it.");