1 files changed, 10 insertions, 0 deletions
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index 15aacea0d4d..70f942a6508 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -2972,3 +2972,13 @@ impl OomStrategy {
         }
     }
 }
+
+/// How to run proc-macro code when building this crate
+#[derive(Clone, Copy, PartialEq, Hash, Debug)]
+pub enum ProcMacroExecutionStrategy {
+    /// Run the proc-macro code on the same thread as the server.
+    SameThread,
+
+    /// Run the proc-macro code on a different thread.
+    CrossThread,
+}