Add Builder::clang_args (plural)

Use AsRef<str> rather than Into<String> because &&str (what you get
when iterating &[&str]) does not implement the latter.

Author: SimonSapin

Cargo.toml

@@ -13,7 +13,7 @@ name = "bindgen"
 readme = "README.md"
 repository = "https://github.com/servo/rust-bindgen"
 documentation = "https://docs.rs/bindgen"
-version = "0.23.0"
+version = "0.23.1"
 build = "build.rs"
 
 exclude = [

bindgen-integration/build.rs

@@ -32,9 +32,7 @@ fn main() {
         .enable_cxx_namespaces()
         .raw_line("pub use self::root::*;")
         .header("cpp/Test.h")
-        .clang_arg("-x")
-        .clang_arg("c++")
-        .clang_arg("-std=c++11")
+        .clang_args(&["-x", "c++", "-std=c++11"])
         .parse_callbacks(Box::new(MacroCallback {macros: macros.clone()}))
         .generate()
         .expect("Unable to generate bindings");

src/lib.rs

@@ -555,6 +555,15 @@ impl Builder {
         self
     }
 
+    /// Add arguments to be passed straight through to clang.
+    pub fn clang_args<I>(mut self, iter: I) -> Builder
+    where I: IntoIterator, I::Item: AsRef<str> {
+        for arg in iter {
+            self.options.clang_args.push(arg.as_ref().into());
+        }
+        self
+    }
+
     /// Make the generated bindings link the given shared library.
     pub fn link<T: Into<String>>(mut self, library: T) -> Builder {
         self.options.links.push((library.into(), LinkType::Default));