rewrite suspicious-library in rmake

Author: Oneirical

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -246,7 +246,6 @@ run-make/static-pie/Makefile
 run-make/staticlib-blank-lib/Makefile
 run-make/staticlib-dylib-linkage/Makefile
 run-make/std-core-cycle/Makefile
-run-make/suspicious-library/Makefile
 run-make/symbol-mangling-hashed/Makefile
 run-make/symbol-visibility/Makefile
 run-make/symbols-include-type-name/Makefile

tests/run-make/incr-prev-body-beyond-eof/rmake.rs

@@ -7,23 +7,19 @@
 // was hashed by rustc in addition to the span length, and the fix still
 // works.
 
-// FIXME: Ignore flags temporarily disabled for the test.
-// ignore-none
-// ignore-nvptx64-nvidia-cuda
-
 use run_make_support::{rustc, target, tmp_dir};
 use std::fs;
 
 fn main() {
-    fs::create_dir(tmp_dir().join("src"));
-    fs::create_dir(tmp_dir().join("incr"));
-    fs::copy("a.rs", tmp_dir().join("main.rs"));
+    fs::create_dir(tmp_dir().join("src")).unwrap();
+    fs::create_dir(tmp_dir().join("incr")).unwrap();
+    fs::copy("a.rs", tmp_dir().join("main.rs")).unwrap();
     rustc()
         .incremental(tmp_dir().join("incr"))
         .input(tmp_dir().join("src/main.rs"))
         .target(target())
         .run();
-    fs::copy("b.rs", tmp_dir().join("main.rs"));
+    fs::copy("b.rs", tmp_dir().join("main.rs")).unwrap();
     rustc()
         .incremental(tmp_dir().join("incr"))
         .input(tmp_dir().join("src/main.rs"))

tests/run-make/suspicious-library/Makefile

@@ -0,0 +1,14 @@
+// This test creates some fake dynamic libraries with nothing inside,
+// and checks if rustc avoids them and successfully compiles as a result.
+
+//@ ignore-cross-compile
+
+use run_make_support::{dynamic_lib, rustc};
+use std::fs::File;
+
+fn main() {
+    rustc().input("foo.rs").arg("-Cprefer-dynamic").run();
+    File::create(dynamic_lib("foo-something-special")).unwrap();
+    File::create(dynamic_lib("foo-something-special2")).unwrap();
+    rustc().input("bar.rs").run();
+}