Rollup merge of rust-lang#125638 - Oneirical:lets-find-some-tests, r=jieyouxu

Rewrite `lto-smoke`, `simple-rlib` and `mixing-deps` `run-make` tests in `rmake.rs` format

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

Author: jieyouxu

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -144,7 +144,6 @@ run-make/lto-linkage-used-attr/Makefile
 run-make/lto-no-link-whole-rlib/Makefile
 run-make/lto-readonly-lib/Makefile
 run-make/lto-smoke-c/Makefile
-run-make/lto-smoke/Makefile
 run-make/macos-deployment-target/Makefile
 run-make/macos-fat-archive/Makefile
 run-make/manual-crate-name/Makefile
@@ -156,7 +155,6 @@ run-make/min-global-align/Makefile
 run-make/mingw-export-call-convention/Makefile
 run-make/mismatching-target-triples/Makefile
 run-make/missing-crate-dependency/Makefile
-run-make/mixing-deps/Makefile
 run-make/mixing-formats/Makefile
 run-make/mixing-libs/Makefile
 run-make/msvc-opt-minsize/Makefile
@@ -238,7 +236,6 @@ run-make/short-ice/Makefile
 run-make/silly-file-names/Makefile
 run-make/simd-ffi/Makefile
 run-make/simple-dylib/Makefile
-run-make/simple-rlib/Makefile
 run-make/split-debuginfo/Makefile
 run-make/stable-symbol-names/Makefile
 run-make/static-dylib-by-default/Makefile

tests/run-make/lto-smoke/Makefile

@@ -0,0 +1,16 @@
+// A simple smoke test to check that link time optimization
+// (LTO) is accepted by the compiler, and that
+// passing its various flags still results in successful compilation.
+// See https://github.com/rust-lang/rust/issues/10741
+
+//@ ignore-cross-compile
+
+use run_make_support::rustc;
+
+fn main() {
+    let lto_flags = ["-Clto", "-Clto=yes", "-Clto=off", "-Clto=thin", "-Clto=fat"];
+    for flag in lto_flags {
+        rustc().input("lib.rs").run();
+        rustc().input("main.rs").arg(flag).run();
+    }
+}

tests/run-make/lto-smoke/rmake.rs

@@ -0,0 +1,13 @@
+// This test invokes the main function in prog.rs, which has dependencies
+// in both an rlib and a dylib. This test checks that these different library
+// types can be successfully mixed.
+//@ ignore-cross-compile
+
+use run_make_support::{run, rustc};
+
+fn main() {
+    rustc().input("both.rs").arg("-Cprefer-dynamic").run();
+    rustc().input("dylib.rs").arg("-Cprefer-dynamic").run();
+    rustc().input("prog.rs").run();
+    run("prog");
+}

tests/run-make/mixing-deps/Makefile

@@ -0,0 +1,2 @@
+#![crate_type = "rlib"]
+pub fn bar() {}

tests/run-make/mixing-deps/rmake.rs

@@ -0,0 +1,12 @@
+// A simple test, where foo.rs has a dependency
+// on the rlib (a static Rust-specific library format) bar.rs. If the test passes,
+// rlibs can be built and linked into another file successfully..
+
+//@ aux-crate:bar=simple-rlib.rs
+//@ run-pass
+
+extern crate bar;
+
+fn main() {
+    bar::bar();
+}