rewrite macos-fat-archive to rmake

Author: Oneirical

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

@@ -30,8 +30,8 @@ pub use cc::{cc, extra_c_flags, extra_cxx_flags, Cc};
 pub use clang::{clang, Clang};
 pub use diff::{diff, Diff};
 pub use llvm::{
-    llvm_filecheck, llvm_objdump, llvm_profdata, llvm_readobj, LlvmFilecheck, LlvmObjdump,
-    LlvmProfdata, LlvmReadobj,
+    llvm_ar, llvm_filecheck, llvm_objdump, llvm_profdata, llvm_readobj, LlvmAr, LlvmFilecheck,
+    LlvmObjdump, LlvmProfdata, LlvmReadobj,
 };
 pub use run::{cmd, run, run_fail, run_with_args};
 pub use rustc::{aux_build, bare_rustc, rustc, Rustc};

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

@@ -29,6 +29,12 @@ pub fn llvm_objdump() -> LlvmObjdump {
     LlvmObjdump::new()
 }
 
+/// Construct a new `llvm-ar` invocation. This assumes that `llvm-ar` is available
+/// at `$LLVM_BIN_DIR/llvm-ar`.
+pub fn llvm_ar() -> LlvmAr {
+    LlvmAr::new()
+}
+
 /// A `llvm-readobj` invocation builder.
 #[derive(Debug)]
 #[must_use]
@@ -57,10 +63,18 @@ pub struct LlvmObjdump {
     cmd: Command,
 }
 
+/// A `llvm-ar` invocation builder.
+#[derive(Debug)]
+#[must_use]
+pub struct LlvmAr {
+    cmd: Command,
+}
+
 crate::impl_common_helpers!(LlvmReadobj);
 crate::impl_common_helpers!(LlvmProfdata);
 crate::impl_common_helpers!(LlvmFilecheck);
 crate::impl_common_helpers!(LlvmObjdump);
+crate::impl_common_helpers!(LlvmAr);
 
 /// Generate the path to the bin directory of LLVM.
 #[must_use]
@@ -204,3 +218,26 @@ impl LlvmObjdump {
         self
     }
 }
+
+impl LlvmAr {
+    /// Construct a new `llvm-ar` invocation. This assumes that `llvm-ar` is available
+    /// at `$LLVM_BIN_DIR/llvm-ar`.
+    pub fn new() -> Self {
+        let llvm_ar = llvm_bin_dir().join("llvm-ar");
+        let cmd = Command::new(llvm_ar);
+        Self { cmd }
+    }
+
+    pub fn obj_to_ar(&mut self) -> &mut Self {
+        self.cmd.arg("rcus");
+        self
+    }
+
+    /// Provide an output, then an input file. Bundled in one function, as llvm-ar has
+    /// no "--output"-style flag.
+    pub fn output_input(&mut self, out: impl AsRef<Path>, input: impl AsRef<Path>) -> &mut Self {
+        self.cmd.arg(out.as_ref());
+        self.cmd.arg(input.as_ref());
+        self
+    }
+}

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -76,7 +76,6 @@ run-make/lto-linkage-used-attr/Makefile
 run-make/lto-no-link-whole-rlib/Makefile
 run-make/lto-smoke-c/Makefile
 run-make/macos-deployment-target/Makefile
-run-make/macos-fat-archive/Makefile
 run-make/manual-link/Makefile
 run-make/min-global-align/Makefile
 run-make/missing-crate-dependency/Makefile

tests/run-make/macos-fat-archive/Makefile

@@ -0,0 +1,20 @@
+// macOS (and iOS) has a concept of universal (fat) binaries which contain code for multiple CPU
+// architectures in the same file. Apple is migrating from x86_64 to aarch64 CPUs,
+// so for the next few years it will be important for macOS developers to
+// build "fat" binaries (executables and cdylibs).
+
+// Rustc used to be unable to handle these special libraries, which was fixed in #98736. If
+// compilation in this test is successful, the native fat library was successfully linked to.
+// See https://github.com/rust-lang/rust/issues/55235
+
+//@ only-apple
+
+use run_make_support::{cc, llvm_ar, rustc};
+
+fn main() {
+    cc().args(&["-arch", "arm64", "-arch", "x86_64", "native-library.c", "-c"])
+        .out_exe("native-library.o")
+        .run();
+    llvm_ar().obj_to_ar().output_input("libnative-library.a", "native-library.o").run();
+    rustc().input("lib.rs").crate_type("lib").arg("-lstatic=native-library").run();
+}