Add --print target-spec-json-schema

This schema is helpful for people writing custom target spec JSON. It
can provide autocomplete in the editor, and also serves as documentation
when there are documentation comments on the structs, as `schemars` will
put them in the schema.

1 files changed, 4 insertions, 1 deletions

diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index 9793d8091e2..297df7c2c97 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -70,6 +70,7 @@ pub const PRINT_KINDS: &[(&str, PrintKind)] = &[
     ("target-libdir", PrintKind::TargetLibdir),
     ("target-list", PrintKind::TargetList),
     ("target-spec-json", PrintKind::TargetSpecJson),
+    ("target-spec-json-schema", PrintKind::TargetSpecJsonSchema),
     ("tls-models", PrintKind::TlsModels),
     // tidy-alphabetical-end
 ];
@@ -1043,6 +1044,7 @@ pub enum PrintKind {
     TargetLibdir,
     TargetList,
     TargetSpecJson,
+    TargetSpecJsonSchema,
     TlsModels,
     // tidy-alphabetical-end
 }
@@ -2323,7 +2325,8 @@ fn is_print_request_stable(print_kind: PrintKind) -> bool {
         | PrintKind::CheckCfg
         | PrintKind::CrateRootLintLevels
         | PrintKind::SupportedCrateTypes
-        | PrintKind::TargetSpecJson => false,
+        | PrintKind::TargetSpecJson
+        | PrintKind::TargetSpecJsonSchema => false,
         _ => true,
     }
 }