rewrite redundant-libs to rmake

Author: Oneirical

src/tools/run-make-support/src/external_deps/c_build.rs

@@ -35,7 +35,8 @@ pub fn build_native_static_lib(lib_name: &str) -> PathBuf {
 pub fn build_native_dynamic_lib(lib_name: &str) -> PathBuf {
     let obj_file = if is_msvc() { format!("{lib_name}") } else { format!("{lib_name}.o") };
     let src = format!("{lib_name}.c");
-    let lib_path = dynamic_lib_name(lib_name);
+    let lib_path =
+        if is_msvc() { format!("{lib_name}.dll.lib") } else { dynamic_lib_name(lib_name) };
     if is_msvc() {
         cc().arg("-c").out_exe(&obj_file).input(src).run();
     } else {

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -62,7 +62,6 @@ run-make/print-target-list/Makefile
 run-make/raw-dylib-import-name-type/Makefile
 run-make/raw-dylib-link-ordinal/Makefile
 run-make/raw-dylib-stdcall-ordinal/Makefile
-run-make/redundant-libs/Makefile
 run-make/remap-path-prefix-dwarf/Makefile
 run-make/reproducible-build-2/Makefile
 run-make/reproducible-build/Makefile

tests/run-make/redundant-libs/Makefile

@@ -0,0 +1,28 @@
+// rustc will remove one of the two redundant references to foo below.  Depending
+// on which one gets removed, we'll get a linker error on SOME platforms (like
+// Linux).  On these platforms, when a library is referenced, the linker will
+// only pull in the symbols needed _at that point in time_.  If a later library
+// depends on additional symbols from the library, they will not have been pulled
+// in, and you'll get undefined symbols errors.
+//
+// So in this example, we need to ensure that rustc keeps the _later_ reference
+// to foo, and not the former one.
+
+//@ ignore-cross-compile
+// Reason: the compiled binary is executed
+
+//FIXME(Oneirical): msvc
+
+use run_make_support::{build_native_dynamic_lib, build_native_static_lib, run, rustc};
+
+fn main() {
+    build_native_dynamic_lib("foo");
+    build_native_static_lib("bar");
+    build_native_static_lib("baz");
+    rustc()
+        .input("main.rs")
+        .args(&["-lstatic=bar", "-lfoo", "-lstatic=baz", "-lfoo"])
+        .print("link-args")
+        .run();
+    run("main");
+}