Migrate atomic-lock-free to rmake

src/tools/run-make-support/src/lib.rs

@@ -61,7 +61,7 @@ pub use env::{env_var, env_var_os};
 pub use run::{cmd, run, run_fail, run_with_args};
 
 /// Helpers for checking target information.
-pub use targets::{is_darwin, is_msvc, is_windows, target, uname};
+pub use targets::{is_darwin, is_msvc, is_windows, llvm_components_contain, target, uname};
 
 /// Helpers for building names of output artifacts that are potentially target-specific.
 pub use artifact_names::{

src/tools/run-make-support/src/targets.rs

@@ -28,6 +28,13 @@ pub fn is_darwin() -> bool {
     target().contains("darwin")
 }
 
+/// Check if `component` is within `LLVM_COMPONENTS`
+#[must_use]
+pub fn llvm_components_contain(component: &str) -> bool {
+    // `LLVM_COMPONENTS` is a space-separated list of words
+    env_var("LLVM_COMPONENTS").split_whitespace().find(|s| s == &component).is_some()
+}
+
 /// Run `uname`. This assumes that `uname` is available on the platform!
 #[track_caller]
 #[must_use]

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -1,5 +1,4 @@
 run-make/archive-duplicate-names/Makefile
-run-make/atomic-lock-free/Makefile
 run-make/branch-protection-check-IBT/Makefile
 run-make/c-dynamic-dylib/Makefile
 run-make/c-dynamic-rlib/Makefile

tests/run-make/atomic-lock-free/rmake.rs

@@ -0,0 +1,52 @@
+// This tests ensure that atomic types are never lowered into runtime library calls that are not
+// guaranteed to be lock-free.
+
+//@ only-linux
+
+use run_make_support::{llvm_components_contain, llvm_readobj, rustc};
+
+fn compile(target: &str) {
+    rustc().input("atomic_lock_free.rs").target(target).run();
+}
+
+fn check() {
+    llvm_readobj()
+        .symbols()
+        .input("libatomic_lock_free.rlib")
+        .run()
+        .assert_stdout_not_contains("__atomic_fetch_add");
+}
+
+fn compile_and_check(target: &str) {
+    compile(target);
+    check();
+}
+
+fn main() {
+    if llvm_components_contain("x86") {
+        compile_and_check("i686-unknown-linux-gnu");
+        compile_and_check("x86_64-unknown-linux-gnu");
+    }
+    if llvm_components_contain("arm") {
+        compile_and_check("arm-unknown-linux-gnueabi");
+        compile_and_check("arm-unknown-linux-gnueabihf");
+        compile_and_check("armv7-unknown-linux-gnueabihf");
+        compile_and_check("thumbv7neon-unknown-linux-gnueabihf");
+    }
+    if llvm_components_contain("aarch64") {
+        compile_and_check("aarch64-unknown-linux-gnu");
+    }
+    if llvm_components_contain("mips") {
+        compile_and_check("mips-unknown-linux-gnu");
+        compile_and_check("mipsel-unknown-linux-gnu");
+    }
+    if llvm_components_contain("powerpc") {
+        compile_and_check("powerpc-unknown-linux-gnu");
+        compile_and_check("powerpc-unknown-linux-gnuspe");
+        compile_and_check("powerpc64-unknown-linux-gnu");
+        compile_and_check("powerpc64le-unknown-linux-gnu");
+    }
+    if llvm_components_contain("systemz") {
+        compile_and_check("s390x-unknown-linux-gnu");
+    }
+}