Auto merge of #128407 - Oneirical:feline-dotestication, r=<try>

Migrate `min-global-align` and `no-alloc-shim` `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: x86_64-msvc

Author: bors

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

@@ -47,6 +47,20 @@ pub fn assert_not_contains<H: AsRef<str>, N: AsRef<str>>(haystack: H, needle: N)
     }
 }
 
+/// Assert that `haystack` contains `needle` a `count` number of times.
+#[track_caller]
+pub fn assert_count_is<H: AsRef<str>, N: AsRef<str>>(count: usize, haystack: H, needle: N) {
+    let haystack = haystack.as_ref();
+    let needle = needle.as_ref();
+    if count != haystack.matches(needle).count() {
+        eprintln!("=== HAYSTACK ===");
+        eprintln!("{}", haystack);
+        eprintln!("=== NEEDLE ===");
+        eprintln!("{}", needle);
+        panic!("needle did not appear {count} times in haystack");
+    }
+}
+
 /// Assert that all files in `dir1` exist and have the same content in `dir2`
 pub fn assert_dirs_are_equal(dir1: impl AsRef<Path>, dir2: impl AsRef<Path>) {
     let dir2 = dir2.as_ref();

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

@@ -84,7 +84,7 @@ pub use path_helpers::{
 pub use scoped_run::{run_in_tmpdir, test_while_readonly};
 
 pub use assertion_helpers::{
-    assert_contains, assert_dirs_are_equal, assert_equals, assert_not_contains,
+    assert_contains, assert_count_is, assert_dirs_are_equal, assert_equals, assert_not_contains,
 };
 
 pub use string::{

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -29,10 +29,8 @@ run-make/link-cfg/Makefile
 run-make/long-linker-command-lines-cmd-exe/Makefile
 run-make/long-linker-command-lines/Makefile
 run-make/macos-deployment-target/Makefile
-run-make/min-global-align/Makefile
 run-make/native-link-modifier-bundle/Makefile
 run-make/native-link-modifier-whole-archive/Makefile
-run-make/no-alloc-shim/Makefile
 run-make/no-builtins-attribute/Makefile
 run-make/pdb-buildinfo-cl-cmd/Makefile
 run-make/pgo-gen-lto/Makefile

tests/run-make/min-global-align/Makefile

@@ -0,0 +1,27 @@
+// This tests ensure that global variables respect the target minimum alignment.
+// The three bools `STATIC_BOOL`, `STATIC_MUT_BOOL`, and `CONST_BOOL` all have
+// type-alignment of 1, but some targets require greater global alignment.
+// See https://github.com/rust-lang/rust/pull/44440
+
+//@ only-linux
+// Reason: this test is target-independent, considering compilation is targeted
+// towards linux architectures only.
+
+use run_make_support::{assert_count_is, llvm_components_contain, rfs, rustc};
+
+fn main() {
+    // Most targets are happy with default alignment -- take i686 for example.
+    if llvm_components_contain("x86") {
+        rustc().target("i686-unknown-linux-gnu").emit("llvm-ir").input("min_global_align.rs").run();
+        assert_count_is(3, rfs::read_to_string("min_global_align.ll"), "align 1");
+    }
+    // SystemZ requires even alignment for PC-relative addressing.
+    if llvm_components_contain("systemz") {
+        rustc()
+            .target("s390x-unknown-linux-gnu")
+            .emit("llvm-ir")
+            .input("min_global_align.rs")
+            .run();
+        assert_count_is(3, rfs::read_to_string("min_global_align.ll"), "align 2");
+    }
+}

tests/run-make/min-global-align/rmake.rs

@@ -0,0 +1,36 @@
+// This test checks the compatibility of the interaction between `--emit obj` and
+// `#[global_allocator]`, as it is now possible to invoke the latter without the
+// allocator shim since #86844. As this feature is unstable, it should fail if
+// --cfg check_feature_gate is passed.
+// See https://github.com/rust-lang/rust/pull/86844
+
+//@ ignore-cross-compile
+// Reason: the compiled binary is executed
+
+//FIXME(Oneirical): ignore-msvc FIXME(bjorn3) can't figure out how to link with the MSVC toolchain
+
+use run_make_support::{cc, cwd, has_extension, has_prefix, run, rustc, shallow_find_files};
+
+fn main() {
+    rustc().input("foo.rs").crate_type("bin").emit("obj").panic("abort").run();
+    let libdir = rustc().print("target-libdir").run().stdout_utf8();
+    let libdir = libdir.trim();
+    let alloc_libs = shallow_find_files(&libdir, |path| {
+        has_prefix(path, "liballoc-") && has_extension(path, "rlib")
+    });
+    let core_libs = shallow_find_files(libdir, |path| {
+        has_prefix(path, "libcore-") && has_extension(path, "rlib")
+    });
+    cc().input("foo.o").out_exe("foo").args(&alloc_libs).args(&core_libs).run();
+    run("foo");
+
+    // Check that linking without __rust_no_alloc_shim_is_unstable defined fails
+    rustc()
+        .input("foo.rs")
+        .crate_type("bin")
+        .emit("obj")
+        .panic("abort")
+        .cfg("check_feature_gate")
+        .run();
+    cc().input("foo.o").out_exe("foo").args(&alloc_libs).args(&core_libs).run_fail();
+}