rewrite issue-14500 to rmake

Author: Oneirical

src/tools/run-make-support/src/rustc.rs

@@ -150,6 +150,20 @@ impl Rustc {
         self
     }
 
+    /// Pass a codegen option.
+    pub fn codegen_option(&mut self, option: &str) -> &mut Self {
+        self.cmd.arg("-C");
+        self.cmd.arg(option);
+        self
+    }
+
+    /// Add a directory to the library search path.
+    pub fn library_search_path<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+        self.cmd.arg("-L");
+        self.cmd.arg(path.as_ref());
+        self
+    }
+
     /// Specify the edition year.
     pub fn edition(&mut self, edition: &str) -> &mut Self {
         self.cmd.arg("--edition");

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -99,7 +99,6 @@ run-make/issue-107094/Makefile
 run-make/issue-10971-temps-dir/Makefile
 run-make/issue-109934-lto-debuginfo/Makefile
 run-make/issue-11908/Makefile
-run-make/issue-14500/Makefile
 run-make/issue-14698/Makefile
 run-make/issue-15460/Makefile
 run-make/issue-18943/Makefile

tests/run-make/issue-14500/Makefile

@@ -0,0 +1,31 @@
+// Test to make sure that reachable extern fns are always available in final
+// productcs, including when LTO is used.
+
+// In this test, the `foo` crate has a reahable symbol,
+// and is a dependency of the `bar` crate. When the `bar` crate
+// is compiled with LTO, it shouldn't strip the symbol from `foo`, and that's the
+// only way that `foo.c` will successfully compile.
+// See https://github.com/rust-lang/rust/issues/14500
+
+//@ ignore-cross-compile
+
+use run_make_support::{cc, extra_c_flags, run, rustc};
+
+fn main() {
+    let libbar_path = tmp_dir().join("libbar.a");
+    rustc().input("foo.rs")
+        .crate_type("rlib")
+        .run();
+    rustc().input("bar.rs")
+        .static_lib("staticlib")
+        .codegen_option("lto")
+        .library_search_path(".")
+        .output(&libbar_path)
+        .run();
+    cc().input("foo.c")
+        .input(libbar_path)
+        .args(&extra_c_flags())
+        .out_exe("foo")
+        .run();
+    run("foo");
+}