migrate thumb-none-qemu to rmake

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -22,6 +22,5 @@ run-make/rlib-format-packed-bundled-libs/Makefile
 run-make/split-debuginfo/Makefile
 run-make/symbol-mangling-hashed/Makefile
 run-make/sysroot-crates-are-unstable/Makefile
-run-make/thumb-none-qemu/Makefile
 run-make/translation/Makefile
 run-make/x86_64-fortanix-unknown-sgx-lvi/Makefile

tests/run-make/thumb-none-qemu/rmake.rs

@@ -0,0 +1,51 @@
+//! How to run this
+//! $ ./x.py clean
+//! $ ./x.py test --target thumbv6m-none-eabi,thumbv7m-none-eabi tests/run-make
+//!
+//! For supported targets, see `example/.cargo/config`
+
+//@ only-thumb
+
+use std::path::PathBuf;
+
+use run_make_support::{cmd, env_var};
+
+const CRATE: &str = "example";
+
+fn main() {
+    std::env::set_current_dir(CRATE).unwrap();
+
+    let target = env_var("TARGET");
+    let bootstrap_cargo = env_var("BOOTSTRAP_CARGO");
+    let path = env_var("PATH");
+    let rustc = env_var("RUSTC");
+
+    let target_dir = PathBuf::from("target");
+    let manifest_path = PathBuf::from("Cargo.toml");
+
+    let debug = {
+        let mut cmd = cmd(&bootstrap_cargo);
+        cmd.args(&["run", "--target", &target])
+            .env("RUSTFLAGS", "-C linker=arm-none-eabi-ld -C link-arg=-Tlink.x")
+            .env("CARGO_TARGET_DIR", &target_dir)
+            .env("PATH", &path)
+            .env("RUSTC", &rustc);
+        cmd.run()
+    };
+
+    let stdout = debug.stdout_utf8();
+    assert!(stdout.contains("x = 42"), "stdout: {:?}", stdout);
+
+    let release = {
+        let mut cmd = cmd(&bootstrap_cargo);
+        cmd.args(&["run", "--release", "--target", &target])
+            .env("RUSTFLAGS", "-C linker=arm-none-eabi-ld -C link-arg=-Tlink.x")
+            .env("CARGO_TARGET_DIR", &target_dir)
+            .env("PATH", &path)
+            .env("RUSTC", &rustc);
+        cmd.run()
+    };
+
+    let stdout = release.stdout_utf8();
+    assert!(stdout.contains("x = 42"), "stdout: {:?}", stdout);
+}