choose a more specific LLVM target on OS X when necessary

This behavior matches clang's behavior, and makes cross-language LTO
possible.

Fixes #60235.

2 files changed, 52 insertions, 0 deletions

diff --git a/src/test/codegen/i686-macosx-deployment-target.rs b/src/test/codegen/i686-macosx-deployment-target.rs
new file mode 100644
index 00000000000..dad376d6677
--- /dev/null
+++ b/src/test/codegen/i686-macosx-deployment-target.rs
@@ -0,0 +1,26 @@
+//
+// Checks that we correctly modify the target when MACOSX_DEPLOYMENT_TARGET is set.
+// See issue #60235.
+
+// compile-flags: -O --target=i686-apple-darwin --crate-type=rlib
+// rustc-env:MACOSX_DEPLOYMENT_TARGET=10.9
+#![feature(no_core, lang_items)]
+#![no_core]
+
+#[lang="sized"]
+trait Sized { }
+#[lang="freeze"]
+trait Freeze { }
+#[lang="copy"]
+trait Copy { }
+
+#[repr(C)]
+pub struct Bool {
+    b: bool,
+}
+
+// CHECK: target triple = "i686-apple-macosx10.9.0"
+#[no_mangle]
+pub extern "C" fn structbool() -> Bool {
+    Bool { b: true }
+}
diff --git a/src/test/codegen/x86_64-macosx-deployment-target.rs b/src/test/codegen/x86_64-macosx-deployment-target.rs
new file mode 100644
index 00000000000..8e291b7b298
--- /dev/null
+++ b/src/test/codegen/x86_64-macosx-deployment-target.rs
@@ -0,0 +1,26 @@
+//
+// Checks that we correctly modify the target when MACOSX_DEPLOYMENT_TARGET is set.
+// See issue #60235.
+
+// compile-flags: -O --target=x86_64-apple-darwin --crate-type=rlib
+// rustc-env:MACOSX_DEPLOYMENT_TARGET=10.9
+#![feature(no_core, lang_items)]
+#![no_core]
+
+#[lang="sized"]
+trait Sized { }
+#[lang="freeze"]
+trait Freeze { }
+#[lang="copy"]
+trait Copy { }
+
+#[repr(C)]
+pub struct Bool {
+    b: bool,
+}
+
+// CHECK: target triple = "x86_64-apple-macosx10.9.0"
+#[no_mangle]
+pub extern "C" fn structbool() -> Bool {
+    Bool { b: true }
+}