rewrite mixing-libs to rmake

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -90,7 +90,6 @@ run-make/manual-link/Makefile
 run-make/metadata-dep-info/Makefile
 run-make/min-global-align/Makefile
 run-make/missing-crate-dependency/Makefile
-run-make/mixing-libs/Makefile
 run-make/native-link-modifier-bundle/Makefile
 run-make/native-link-modifier-whole-archive/Makefile
 run-make/no-alloc-shim/Makefile

tests/run-make/mixing-libs/Makefile

@@ -1,8 +0,0 @@
-# ignore-cross-compile
-include ../tools.mk
-
-all:
-	$(RUSTC) rlib.rs --crate-type=rlib --crate-type=dylib
-	$(RUSTC) dylib.rs # no -Cprefer-dynamic so statically linking librlib.rlib
-	$(call REMOVE_DYLIBS,rlib) # remove librlib.so to test that prog.rs doesn't get confused about the removed dylib version of librlib
-	$(RUSTC) prog.rs && exit 1 || exit 0

tests/run-make/mixing-libs/rmake.rs

@@ -0,0 +1,21 @@
+// Having multiple upstream crates available in different formats
+// should result in failed compilation. This test causes multiple
+// libraries to exist simultaneously as rust libs and dynamic libs,
+// causing prog.rs to fail compilation.
+// See https://github.com/rust-lang/rust/issues/10434
+
+//@ ignore-cross-compile
+
+use run_make_support::{remove_dylibs, rustc};
+
+fn main() {
+    rustc().input("rlib.rs").crate_type("rlib").crate_type("dylib").run();
+
+    // Not putting `-C prefer-dynamic` here allows for static linking of librlib.rlib.
+    rustc().input("dylib.rs").run();
+
+    // librlib's dynamic version needs to be removed here to prevent prog.rs from fetching
+    // the wrong one.
+    remove_dylibs("rlib");
+    rustc().input("prog.rs").run_fail();
+}