Auto merge of rust-lang#127693 - Rejyr:migrate-crate-hash-rustc-versi…

…on-rmake, r=<try>

Migrate `crate-hash-rustc-version` to `rmake`

Part of rust-lang#121876.

r? `@jieyouxu`

try-job: x86_64-msvc
try-job: aarch64-apple
try-job: dist-x86_64-linux

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 +1,46 @@
+// Ensure that crates compiled with different rustc versions cannot
+// be dynamically linked.
+
+//@ ignore-cross-compile
+
+use run_make_support::{cmd, diff, dynamic_lib_name, is_darwin, run, run_fail, rustc};
+
+fn main() {
+    let flags = ["-Cprefer-dynamic", "-Csymbol-mangling-version=v0"];
+    let nm_flag = if is_darwin() { ["-D"].as_slice() } else { [].as_slice() };
+
+    // a.rs is a dylib
+    rustc().input("a.rs").crate_type("dylib").args(&flags).run();
+
+    // Write symbols to disk.
+    let symbols_before = cmd("nm").args(nm_flag).arg(&dynamic_lib_name("a")).run().stdout_utf8();
+
+    // b.rs is 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, write symbols to disk again.
+    let symbols_after = cmd("nm").args(nm_flag).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");
+}