Merge branch 'master' into coverage

src/librustc_session/options.rs

@@ -961,4 +961,6 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
         "use new LLVM pass manager"),
     instrument_coverage: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "inject code coverage counters and export a counter-to-coverage-span map"),
+    link_native_libraries: Option<bool> = (None, parse_opt_bool, [UNTRACKED],
+        "Link native libraries in the linker invocation."),
 }