3 files changed, 11 insertions, 0 deletions
diff --git a/src/tools/compiletest/src/directive-list.rs b/src/tools/compiletest/src/directive-list.rs
index 086a8a67456..44c52c8c766 100644
--- a/src/tools/compiletest/src/directive-list.rs
+++ b/src/tools/compiletest/src/directive-list.rs
@@ -44,6 +44,7 @@ const KNOWN_DIRECTIVE_NAMES: &[&str] = &[
     "ignore-arm-unknown-linux-gnueabihf",
     "ignore-arm-unknown-linux-musleabi",
     "ignore-arm-unknown-linux-musleabihf",
+    "ignore-auxiliary",
     "ignore-avr",
     "ignore-beta",
     "ignore-cdb",
diff --git a/src/tools/compiletest/src/header/cfg.rs b/src/tools/compiletest/src/header/cfg.rs
index c369fff97f4..f1f1384afb9 100644
--- a/src/tools/compiletest/src/header/cfg.rs
+++ b/src/tools/compiletest/src/header/cfg.rs
@@ -101,6 +101,10 @@ fn parse_cfg_name_directive<'a>(
         message: "always"
     }
     condition! {
+        name: "auxiliary",
+        message: "used by another main test file"
+    }
+    condition! {
         name: &config.target,
         allowed_names: &target_cfgs.all_targets,
         message: "when the target is {name}"
diff --git a/src/tools/compiletest/src/header/tests.rs b/src/tools/compiletest/src/header/tests.rs
index 3a8c3748de9..2525e0adc83 100644
--- a/src/tools/compiletest/src/header/tests.rs
+++ b/src/tools/compiletest/src/header/tests.rs
@@ -940,3 +940,9 @@ fn test_supported_crate_types() {
         "//@ needs-crate-type: bin, cdylib, dylib, lib, proc-macro, rlib, staticlib"
     ));
 }
+
+#[test]
+fn test_ignore_auxiliary() {
+    let config = cfg().build();
+    assert!(check_ignore(&config, "//@ ignore-auxiliary"));
+}