Allow attribute parsers to specify a list of allowed targets

Every acceptor gets an `ALLOWED_TARGETS` specification which can specify per target whether it is allowed, warned, or errored.

1 files changed, 23 insertions, 0 deletions

diff --git a/compiler/rustc_attr_parsing/src/session_diagnostics.rs b/compiler/rustc_attr_parsing/src/session_diagnostics.rs
index 41179844152..95e85667cd6 100644
--- a/compiler/rustc_attr_parsing/src/session_diagnostics.rs
+++ b/compiler/rustc_attr_parsing/src/session_diagnostics.rs
@@ -480,6 +480,29 @@ pub(crate) struct EmptyAttributeList {
     pub attr_span: Span,
 }
 
+#[derive(LintDiagnostic)]
+#[diag(attr_parsing_invalid_target_lint)]
+#[warning]
+#[help]
+pub(crate) struct InvalidTargetLint {
+    pub name: Symbol,
+    pub target: &'static str,
+    pub applied: String,
+    pub only: &'static str,
+}
+
+#[derive(Diagnostic)]
+#[help]
+#[diag(attr_parsing_invalid_target)]
+pub(crate) struct InvalidTarget {
+    #[primary_span]
+    pub span: Span,
+    pub name: Symbol,
+    pub target: &'static str,
+    pub applied: String,
+    pub only: &'static str,
+}
+
 #[derive(Diagnostic)]
 #[diag(attr_parsing_invalid_alignment_value, code = E0589)]
 pub(crate) struct InvalidAlignmentValue {