Emit a diagnostic for invalid target options

Author: saethlin

compiler/rustc_codegen_llvm/messages.ftl

@@ -104,3 +104,6 @@ codegen_llvm_write_output_with_llvm_err = could not write output to {$path}: {$l
 
 codegen_llvm_write_thinlto_key = error while writing ThinLTO key data: {$err}
 codegen_llvm_write_thinlto_key_with_llvm_err = error while writing ThinLTO key data: {$err}: {$llvm_err}
+
+codegen_llvm_invalid_target_feature_prefix =
+    target feature `{$feature}` must begin with a `+` or `-`"

compiler/rustc_codegen_llvm/src/errors.rs

@@ -253,3 +253,9 @@ pub struct MismatchedDataLayout<'a> {
     pub llvm_target: &'a str,
     pub llvm_layout: &'a str,
 }
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_invalid_target_feature_prefix)]
+pub(crate) struct InvalidTargetFeaturePrefix<'a> {
+    pub feature: &'a str,
+}

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -1,7 +1,7 @@
 use crate::back::write::create_informational_target_machine;
 use crate::errors::{
-    PossibleFeature, TargetFeatureDisableOrEnable, UnknownCTargetFeature,
-    UnknownCTargetFeaturePrefix, UnstableCTargetFeature,
+    InvalidTargetFeaturePrefix, PossibleFeature, TargetFeatureDisableOrEnable,
+    UnknownCTargetFeature, UnknownCTargetFeaturePrefix, UnstableCTargetFeature,
 };
 use crate::llvm;
 use libc::c_int;
@@ -511,7 +511,7 @@ pub(crate) fn global_llvm_features(sess: &Session, diagnostics: bool) -> Vec<Str
         sess.target
             .features
             .split(',')
-            .filter(|v| !v.is_empty() && backend_feature_name(v).is_some())
+            .filter(|v| !v.is_empty() && backend_feature_name(sess, v).is_some())
             .map(String::from),
     );
 
@@ -535,7 +535,7 @@ pub(crate) fn global_llvm_features(sess: &Session, diagnostics: bool) -> Vec<Str
                 }
             };
 
-            let feature = backend_feature_name(s)?;
+            let feature = backend_feature_name(sess, s)?;
             // Warn against use of LLVM specific feature names and unstable features on the CLI.
             if diagnostics {
                 let feature_state = supported_features.iter().find(|&&(v, _)| v == feature);
@@ -611,11 +611,11 @@ pub(crate) fn global_llvm_features(sess: &Session, diagnostics: bool) -> Vec<Str
 /// Returns a feature name for the given `+feature` or `-feature` string.
 ///
 /// Only allows features that are backend specific (i.e. not [`RUSTC_SPECIFIC_FEATURES`].)
-fn backend_feature_name(s: &str) -> Option<&str> {
+fn backend_feature_name<'a>(sess: &Session, s: &'a str) -> Option<&'a str> {
     // features must start with a `+` or `-`.
-    let feature = s.strip_prefix(&['+', '-'][..]).unwrap_or_else(|| {
-        bug!("target feature `{}` must begin with a `+` or `-`", s);
-    });
+    let feature = s
+        .strip_prefix(&['+', '-'][..])
+        .unwrap_or_else(|| sess.dcx().emit_fatal(InvalidTargetFeaturePrefix { feature: s }));
     // Rustc-specific feature requests like `+crt-static` or `-crt-static`
     // are not passed down to LLVM.
     if RUSTC_SPECIFIC_FEATURES.contains(&feature) {