1 files changed, 67 insertions, 1 deletions
diff --git a/compiler/rustc_codegen_ssa/src/back/apple/tests.rs b/compiler/rustc_codegen_ssa/src/back/apple/tests.rs
index 7ccda5a8190..8df740a4bcf 100644
--- a/compiler/rustc_codegen_ssa/src/back/apple/tests.rs
+++ b/compiler/rustc_codegen_ssa/src/back/apple/tests.rs
@@ -1,4 +1,4 @@
-use super::{add_version_to_llvm_target, parse_version};
+use super::*;
 
 #[test]
 fn test_add_version_to_llvm_target() {
@@ -19,3 +19,69 @@ fn test_parse_version() {
     assert_eq!(parse_version("10.12.6"), Ok((10, 12, 6)));
     assert_eq!(parse_version("9999.99.99"), Ok((9999, 99, 99)));
 }
+
+#[test]
+#[cfg_attr(not(target_os = "macos"), ignore = "xcode-select is only available on macOS")]
+fn lookup_developer_dir() {
+    let _developer_dir = xcode_select_developer_dir().unwrap();
+}
+
+#[test]
+#[cfg_attr(not(target_os = "macos"), ignore = "xcrun is only available on macOS")]
+fn lookup_sdk() {
+    let (sdk_path, stderr) = xcrun_show_sdk_path("MacOSX", false).unwrap();
+    // Check that the found SDK is valid.
+    assert!(sdk_path.join("SDKSettings.plist").exists());
+    assert_eq!(stderr, "");
+
+    // Test that the SDK root is a subdir of the developer directory.
+    if let Some(developer_dir) = xcode_select_developer_dir() {
+        // Only run this test if SDKROOT is not set (otherwise xcrun may look up via. that).
+        if std::env::var_os("SDKROOT").is_some() {
+            assert!(sdk_path.starts_with(&developer_dir));
+        }
+    }
+}
+
+#[test]
+#[cfg_attr(not(target_os = "macos"), ignore = "xcrun is only available on macOS")]
+fn lookup_sdk_verbose() {
+    let (_, stderr) = xcrun_show_sdk_path("MacOSX", true).unwrap();
+    // Newer xcrun versions should emit something like this:
+    //
+    //     xcrun: note: looking up SDK with 'xcodebuild -sdk macosx -version Path'
+    //     xcrun: note: xcrun_db = '/var/.../xcrun_db'
+    //     xcrun: note: lookup resolved to: '...'
+    //     xcrun: note: database key is: ...
+    //
+    // Or if the value is already cached, something like this:
+    //
+    //     xcrun: note: database key is: ...
+    //     xcrun: note: lookup resolved in '/var/.../xcrun_db' : '...'
+    assert!(
+        stderr.contains("xcrun: note: lookup resolved"),
+        "stderr should contain lookup note: {stderr}",
+    );
+}
+
+#[test]
+#[cfg_attr(not(target_os = "macos"), ignore = "xcrun is only available on macOS")]
+fn try_lookup_invalid_sdk() {
+    // As a proxy for testing all the different ways that `xcrun` can fail,
+    // test the case where an SDK was not found.
+    let err = xcrun_show_sdk_path("invalid", false).unwrap_err();
+    let XcrunError::Unsuccessful { stderr, .. } = err else {
+        panic!("unexpected error kind: {err:?}");
+    };
+    // Either one of (depending on if using Command Line Tools or full Xcode):
+    // xcrun: error: SDK "invalid" cannot be located
+    // xcodebuild: error: SDK "invalid" cannot be located.
+    assert!(
+        stderr.contains(r#"error: SDK "invalid" cannot be located"#),
+        "stderr should contain xcodebuild note: {stderr}",
+    );
+    assert!(
+        stderr.contains("xcrun: error: unable to lookup item 'Path' in SDK 'invalid'"),
+        "stderr should contain xcrun note: {stderr}",
+    );
+}