build_native_static_lib with llvm_ar for run_make_support

Cargo.lock

@@ -228,12 +228,6 @@ dependencies = [
  "backtrace",
 ]
 
-[[package]]
-name = "ar"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d67af77d68a931ecd5cbd8a3b5987d63a1d1d1278f7f6a60ae33db485cdebb69"
-
 [[package]]
 name = "ar_archive_writer"
 version = "0.2.0"
@@ -3429,7 +3423,6 @@ dependencies = [
 name = "run_make_support"
 version = "0.2.0"
 dependencies = [
- "ar",
  "bstr",
  "build_helper",
  "gimli 0.31.0",

src/tools/run-make-support/Cargo.toml

@@ -10,6 +10,4 @@ similar = "2.5.0"
 wasmparser = "0.118.2"
 regex = "1.8" # 1.8 to avoid memchr 2.6.0, as 2.5.0 is pinned in the workspace
 gimli = "0.31.0"
-ar = "0.9.0"
-
 build_helper = { path = "../build_helper" }

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

@@ -30,8 +30,8 @@
 pub use clang::{clang, Clang};
 pub use diff::{diff, Diff};
 pub use llvm::{
-    llvm_filecheck, llvm_objdump, llvm_profdata, llvm_readobj, LlvmFilecheck, LlvmObjdump,
+    llvm_ar, llvm_filecheck, llvm_objdump, llvm_profdata, llvm_readobj, LlvmAr, LlvmFilecheck,
-    LlvmProfdata, LlvmReadobj,
+    LlvmObjdump, LlvmProfdata, LlvmReadobj,
 };
 pub use run::{cmd, run, run_fail, run_with_args};
 pub use rustc::{aux_build, bare_rustc, rustc, Rustc};
@@ -61,19 +61,6 @@ pub fn target() -> String {
     env_var("TARGET")
 }
 
-/// `AR`
-#[track_caller]
-pub fn ar(inputs: &[impl AsRef<Path>], output_path: impl AsRef<Path>) {
-    let output = fs::File::create(&output_path).expect(&format!(
-        "the file in path \"{}\" could not be created",
-        output_path.as_ref().display()
-    ));
-    let mut builder = ar::Builder::new(output);
-    for input in inputs {
-        builder.append_path(input).unwrap();
-    }
-}
-
 /// Check if target is windows-like.
 #[must_use]
 pub fn is_windows() -> bool {
@@ -305,12 +292,12 @@ pub fn build_native_static_lib(lib_name: &str) -> PathBuf {
     } else {
         cc().arg("-v").arg("-c").out_exe(&obj_file).input(src).run();
     };
-    let mut obj_file = PathBuf::from(format!("{lib_name}.o"));
+    let obj_file = if is_msvc() {
-    if is_msvc() {
+        PathBuf::from(format!("{lib_name}.obj"))
-        obj_file.set_extension("");
+    } else {
-        obj_file.set_extension("obj");
+        PathBuf::from(format!("{lib_name}.o"))
-    }
+    };
-    ar(&[obj_file], &lib_path);
+    llvm_ar().obj_to_ar().output_input(&lib_path, &obj_file).run();
     path(lib_path)
 }
 

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 @@ pub fn input<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
         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
+    }
+}

tests/run-make/invalid-library/rmake.rs

@@ -1,8 +1,14 @@
+// When the metadata format changes, old libraries used to cause librustc to abort
+// when reading their metadata. The error message for this scenario was unhelpful at best.
+// A better error message was implemented in #12645, and this test checks that it is the
+// one appearing in stderr in this scenario.
+// See https://github.com/rust-lang/rust/pull/12645
+
 use run_make_support::fs_wrapper::create_file;
-use run_make_support::{ar, rustc};
+use run_make_support::{llvm_ar, rustc};
 
 fn main() {
     create_file("lib.rmeta");
-    ar(&["lib.rmeta"], "libfoo-ffffffff-1.0.rlib");
+    llvm_ar().obj_to_ar().output_input("libfoo-ffffffff-1.0.rlib", "lib.rmeta").run();
     rustc().input("foo.rs").run_fail().assert_stderr_contains("found invalid metadata");
 }

tests/run-make/prune-link-args/rmake.rs

@@ -6,6 +6,8 @@
 // See https://github.com/rust-lang/rust/pull/10749
 
 //@ ignore-cross-compile
+//@ ignore-windows-gnu
+// Reason: The space is parsed as an empty linker argument on windows-gnu.
 
 use run_make_support::rustc;