rewrite share-generics-dylib to rmake

Author: Oneirical

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -50,7 +50,6 @@ run-make/reproducible-build-2/Makefile
 run-make/reproducible-build/Makefile
 run-make/rlib-format-packed-bundled-libs-2/Makefile
 run-make/rlib-format-packed-bundled-libs/Makefile
-run-make/share-generics-dylib/Makefile
 run-make/simd-ffi/Makefile
 run-make/split-debuginfo/Makefile
 run-make/stable-symbol-names/Makefile

tests/run-make/share-generics-dylib/Makefile

@@ -0,0 +1,32 @@
+// This test makes sure all generic instances get re-exported from Rust dylibs for use by
+// `-Zshare-generics`. There are two rlibs (`instance_provider_a` and `instance_provider_b`)
+// which both provide an instance of `Cell<i32>::set`. There is `instance_user_dylib` which is
+// supposed to re-export both these instances, and then there are `instance_user_a_rlib` and
+// `instance_user_b_rlib` which each rely on a specific instance to be available.
+//
+// In the end everything is linked together into `linked_leaf`. If `instance_user_dylib` does
+// not export both then we'll get an `undefined reference` error for one of the instances.
+//
+// This is regression test for https://github.com/rust-lang/rust/issues/67276.
+
+//FIXME(Oneirical): ignore-cross-compile
+
+use run_make_support::rustc;
+
+fn main() {
+    compile("rlib", "instance_provider_a.rs");
+    compile("rlib", "instance_provider_b.rs");
+    compile("dylib", "instance_user_dylib.rs");
+    compile("rlib", "instance_user_a_rlib.rs");
+    compile("rlib", "instance_user_b_rlib.rs");
+    compile("bin", "linked_leaf.rs");
+}
+
+fn compile(crate_type: &str, input: &str) {
+    rustc()
+        .input(input)
+        .crate_type(crate_type)
+        .args(&["-Cprefer-dynamic", "-Zshare-generics=yes", "-Csymbol-mangling-version=v0"])
+        .codegen_units(1)
+        .run();
+}