Vendor things

third-party/vendor/smartstring/build.rs

@@ -0,0 +1,18 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+use version_check as rustc;
+
+fn main() {
+    let ac = autocfg::new();
+    let has_feature = Some(true) == rustc::supports_feature("allocator_api");
+    let has_api = ac.probe_trait("alloc::alloc::Allocator");
+    if has_feature || has_api {
+        autocfg::emit("has_allocator");
+    }
+    if has_feature {
+        autocfg::emit("needs_allocator_feature");
+    }
+    autocfg::rerun_path("build.rs");
+}