1 files changed, 5 insertions, 0 deletions
diff --git a/src/tools/rust-analyzer/crates/proc-macro-srv-cli/build.rs b/src/tools/rust-analyzer/crates/proc-macro-srv-cli/build.rs
new file mode 100644
index 00000000000..07f914fece0
--- /dev/null
+++ b/src/tools/rust-analyzer/crates/proc-macro-srv-cli/build.rs
@@ -0,0 +1,5 @@
+//! This teaches cargo about our cfg(rust_analyzer)
+
+fn main() {
+    println!("cargo:rustc-check-cfg=cfg(rust_analyzer)");
+}