sanitizer support

src/bootstrap/lib.rs

@@ -599,7 +599,8 @@ impl Build {
     /// Get the space-separated set of activated features for the standard
     /// library.
     fn std_features(&self) -> String {
-        let mut features = "panic-unwind".to_string();
+        let mut features = "panic-unwind asan lsan msan tsan".to_string();
+
         if self.config.debug_jemalloc {
             features.push_str(" debug-jemalloc");
         }
@@ -716,6 +717,10 @@ impl Build {
         }
     }
 
+    fn system_llvm(&self, target: &str) -> bool {
+        self.config.target_config.get(target).map(|t| t.system_llvm).unwrap_or(false)
+    }
+
     /// Returns the path to `FileCheck` binary for the specified target
     fn llvm_filecheck(&self, target: &str) -> PathBuf {
         let target_config = self.config.target_config.get(target);