Auto merge of #127778 - Oneirical:artificial-intestlligence, r=<try>

Migrate `staticlib-blank-lib`, `rlib-format-packed-bundled-libs-3` and `issue-97463-abi-param-passing` `run-make` tests to rmake

Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).

Please try:

try-job: aarch64-gnu
try-job: armhf-gnu
try-job: test-various
try-job: x86_64-mingw
try-job: x86_64-msvc
try-job: x86_64-gnu-llvm-18

Author: bors

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

@@ -229,6 +229,8 @@ impl LlvmAr {
         Self { cmd }
     }
 
+    /// Automatically pass the commonly used arguments `rcus`, used for combining one or more
+    /// input object files into one output static library file.
     pub fn obj_to_ar(&mut self) -> &mut Self {
         self.cmd.arg("rcus");
         self

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -37,7 +37,6 @@ run-make/issue-47551/Makefile
 run-make/issue-69368/Makefile
 run-make/issue-84395-lto-embed-bitcode/Makefile
 run-make/issue-88756-default-output/Makefile
-run-make/issue-97463-abi-param-passing/Makefile
 run-make/jobserver-error/Makefile
 run-make/libs-through-symlinks/Makefile
 run-make/libtest-json/Makefile
@@ -73,7 +72,6 @@ run-make/remap-path-prefix-dwarf/Makefile
 run-make/reproducible-build-2/Makefile
 run-make/reproducible-build/Makefile
 run-make/rlib-format-packed-bundled-libs-2/Makefile
-run-make/rlib-format-packed-bundled-libs-3/Makefile
 run-make/rlib-format-packed-bundled-libs/Makefile
 run-make/sanitizer-cdylib-link/Makefile
 run-make/sanitizer-dylib-link/Makefile
@@ -83,7 +81,6 @@ run-make/simd-ffi/Makefile
 run-make/split-debuginfo/Makefile
 run-make/stable-symbol-names/Makefile
 run-make/static-dylib-by-default/Makefile
-run-make/staticlib-blank-lib/Makefile
 run-make/staticlib-dylib-linkage/Makefile
 run-make/symbol-mangling-hashed/Makefile
 run-make/symbol-visibility/Makefile

tests/run-make/issue-97463-abi-param-passing/Makefile

@@ -0,0 +1,84 @@
+// `-Z packed_bundled_libs` is an unstable rustc flag that makes the compiler
+// only require a native library and no supplementary object files to compile.
+// #105601 made it possible to have this behaviour without an unstable flag by
+// passing +bundle in modifiers, and this test checks that this feature successfully
+// compiles and includes only the static libraries, with no object files.
+// See https://github.com/rust-lang/rust/pull/105601
+
+use run_make_support::{
+    build_native_static_lib, is_msvc, llvm_ar, regex, rfs, rust_lib_name, rustc, static_lib_name,
+};
+
+//@ ignore-cross-compile
+// Reason: Invalid library format (not ELF) causes compilation failure
+// in the final `rustc` call.
+
+//@ only-linux
+// Reason: differences in the native lib compilation process causes differences
+// in the --print link-args output
+
+fn main() {
+    build_native_static_lib("native_dep_1");
+    build_native_static_lib("native_dep_2");
+    build_native_static_lib("native_dep_3");
+    build_native_static_lib("native_dep_4");
+    // Test cfg with packed bundle.
+    rustc().input("rust_dep_cfg.rs").crate_type("rlib").run();
+    rustc()
+        .input("main.rs")
+        .extern_("rust_dep", rust_lib_name("rust_dep_cfg"))
+        .crate_type("staticlib")
+        .cfg("should_add")
+        .run();
+    // Only static libraries should appear, no object files at all.
+    llvm_ar()
+        .arg("t")
+        .arg(rust_lib_name("rust_dep_cfg"))
+        .run()
+        .assert_stdout_contains(static_lib_name("native_dep_1"));
+    llvm_ar()
+        .arg("t")
+        .arg(rust_lib_name("rust_dep_cfg"))
+        .run()
+        .assert_stdout_contains(static_lib_name("native_dep_2"));
+    llvm_ar().arg("t").arg(static_lib_name("main")).run().assert_stdout_contains("native_dep_1.o");
+    llvm_ar()
+        .arg("t")
+        .arg(static_lib_name("main"))
+        .run()
+        .assert_stdout_not_contains("native_dep_2.o");
+
+    // Test bundle with whole archive.
+    rustc().input("rust_dep.rs").crate_type("rlib").run();
+    // Only deps with `+bundle` should appear.
+    llvm_ar().arg("t").arg(rust_lib_name("rust_dep")).run().assert_stdout_contains("native_dep_1");
+    llvm_ar().arg("t").arg(rust_lib_name("rust_dep")).run().assert_stdout_contains("native_dep_3");
+    llvm_ar()
+        .arg("t")
+        .arg(rust_lib_name("rust_dep"))
+        .run()
+        .assert_stdout_not_contains("native_dep_2");
+    llvm_ar()
+        .arg("t")
+        .arg(rust_lib_name("rust_dep"))
+        .run()
+        .assert_stdout_not_contains("native_dep_4");
+
+    // The compiler shouldn't use files which it doesn't know about.
+    rfs::remove_file(static_lib_name("native_dep_1"));
+    rfs::remove_file(static_lib_name("native_dep_3"));
+
+    let out = rustc()
+        .input("main.rs")
+        .extern_("rust_dep", rust_lib_name("rust_dep"))
+        .print("link-args")
+        .run()
+        .assert_stdout_not_contains("native_dep_3")
+        .stdout_utf8();
+
+    let re = regex::Regex::new(
+"--whole-archive.*native_dep_1.*--whole-archive.*lnative_dep_2.*no-whole-archive.*lnative_dep_4"
+    ).unwrap();
+
+    assert!(re.is_match(&out));
+}

tests/run-make/rlib-format-packed-bundled-libs-3/Makefile

@@ -0,0 +1,13 @@
+// In this test, the static library foo is made blank, which used to cause
+// a compilation error. As the compiler now returns Ok upon encountering a blank
+// staticlib as of #12379, this test checks that compilation is successful despite
+// the blank staticlib.
+// See https://github.com/rust-lang/rust/pull/12379
+
+use run_make_support::{llvm_ar, rustc, static_lib_name};
+
+fn main() {
+    llvm_ar().obj_to_ar().output_input(static_lib_name("foo"), "foo.rs").run();
+    llvm_ar().arg("d").output_input(static_lib_name("foo"), "foo.rs").run();
+    rustc().input("foo.rs").run();
+}

tests/run-make/rlib-format-packed-bundled-libs-3/rmake.rs

@@ -0,0 +1,25 @@
+// This test was created in response to an obscure miscompilation bug, only
+// visible with the -O3 flag passed to the cc compiler when trying to obtain
+// a native static library for the sake of foreign function interface. This
+// flag could cause certain integer types to fail to be zero-extended, resulting
+// in type casting errors. After the fix in #97800, this test attempts integer casting
+// while simultaneously interfacing with a C library and using the -O3 flag.
+// See https://github.com/rust-lang/rust/issues/97463
+
+//@ ignore-msvc
+// Reason: the rustc compilation fails due to an unresolved external symbol
+
+//@ ignore-cross-compile
+// Reason: The compiled binary is executed.
+
+use run_make_support::{cc, is_msvc, llvm_ar, run, rustc, static_lib_name};
+
+fn main() {
+    // The issue exercised by this test specifically needs needs `-O`
+    // flags (like `-O3`) to reproduce. Thus, we call `cc()` instead of
+    // the nicer `build_native_static_lib`.
+    cc().arg("-c").arg("-O3").out_exe("bad.o").input("bad.c").run();
+    llvm_ar().obj_to_ar().output_input(static_lib_name("bad"), "bad.o").run();
+    rustc().input("param_passing.rs").arg("-lbad").opt_level("3").run();
+    run("param_passing");
+}