Migrate crate-hash-rustc-version to rmake

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -12,7 +12,6 @@ run-make/cdylib-dylib-linkage/Makefile
 run-make/compiler-lookup-paths-2/Makefile
 run-make/compiler-lookup-paths/Makefile
 run-make/compiler-rt-works-on-mingw/Makefile
-run-make/crate-hash-rustc-version/Makefile
 run-make/cross-lang-lto-clang/Makefile
 run-make/cross-lang-lto-pgo-smoketest/Makefile
 run-make/cross-lang-lto-upstream-rlibs/Makefile

tests/run-make/crate-hash-rustc-version/rmake.rs

@@ -0,0 +1,57 @@
+// Ensure that crates compiled with different rustc versions cannot
+// be dynamically linked.
+
+//@ ignore-cross-compile
+//@ only-unix
+
+use run_make_support::llvm;
+use run_make_support::{diff, dynamic_lib_name, is_darwin, run, run_fail, rustc};
+
+fn llvm_readobj() -> llvm::LlvmReadobj {
+    let mut cmd = llvm::llvm_readobj();
+    if is_darwin() {
+        cmd.symbols();
+    } else {
+        cmd.dynamic_table();
+    }
+    cmd
+}
+
+fn main() {
+    let flags = ["-Cprefer-dynamic", "-Csymbol-mangling-version=v0"];
+
+    // a.rs is compiled to a dylib
+    rustc().input("a.rs").crate_type("dylib").args(&flags).run();
+
+    // Store symbols
+    let symbols_before = llvm_readobj().arg(dynamic_lib_name("a")).run().stdout_utf8();
+
+    // b.rs is compiled to a binary
+    rustc()
+        .input("b.rs")
+        .extern_("a", dynamic_lib_name("a"))
+        .crate_type("bin")
+        .arg("-Crpath")
+        .args(&flags)
+        .run();
+    run("b");
+
+    // Now re-compile a.rs with another rustc version
+    rustc()
+        .env("RUSTC_FORCE_RUSTC_VERSION", "deadfeed")
+        .input("a.rs")
+        .crate_type("dylib")
+        .args(&flags)
+        .run();
+
+    // After compiling with a different rustc version, store symbols again.
+    let symbols_after = llvm_readobj().arg(dynamic_lib_name("a")).run().stdout_utf8();
+
+    // As a sanity check, test if the symbols changed:
+    // If the symbols are identical, there's been an error.
+    diff()
+        .expected_text("symbols_before", symbols_before)
+        .actual_text("symbols_after", symbols_after)
+        .run_fail();
+    run_fail("b");
+}