rewrite min-global-align to rmake

Author: Oneirical

Diff for: src/tools/run-make-support/src/assertion_helpers.rs

@@ -77,6 +77,20 @@ pub fn assert_not_contains_regex<H: AsRef<str>, N: AsRef<str>>(haystack: H, need
     }
 }
 
+/// 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();

Diff for: src/tools/run-make-support/src/lib.rs

@@ -87,7 +87,7 @@ pub use path_helpers::{
 pub use scoped_run::{run_in_tmpdir, test_while_readonly};
 
 pub use assertion_helpers::{
-    assert_contains, assert_contains_regex, assert_dirs_are_equal, assert_equals,
+    assert_contains, assert_contains_regex, assert_count_is, assert_dirs_are_equal, assert_equals,
     assert_not_contains, assert_not_contains_regex,
 };
 

Diff for: src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -13,7 +13,6 @@ run-make/libtest-json/Makefile
 run-make/libtest-junit/Makefile
 run-make/libtest-thread-limit/Makefile
 run-make/macos-deployment-target/Makefile
-run-make/min-global-align/Makefile
 run-make/native-link-modifier-bundle/Makefile
 run-make/no-alloc-shim/Makefile
 run-make/reproducible-build/Makefile

Diff for: 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");
+    }
+}