ir: Skip function template earlier.

This should fix rust-lang#364.

Author: upsuper

libbindgen/Cargo.toml

@@ -12,7 +12,7 @@ license = "BSD-3-Clause"
 name = "libbindgen"
 readme = "README.md"
 repository = "https://github.com/servo/rust-bindgen"
-version = "0.1.4"
+version = "0.1.5"
 workspace = ".."
 
 [dev-dependencies]

libbindgen/src/ir/function.rs

@@ -134,6 +134,11 @@ impl FunctionSig {
         use clang_sys::*;
         debug!("FunctionSig::from_ty {:?} {:?}", ty, cursor);
 
+        // Skip function templates
+        if cursor.kind() == CXCursor_FunctionTemplate {
+            return Err(ParseError::Continue);
+        }
+
         // Don't parse operatorxx functions in C++
         let spelling = cursor.spelling();
         if spelling.starts_with("operator") {

libbindgen/tests/expectations/tests/template_function_with_auto.rs

@@ -0,0 +1,10 @@
+/* automatically generated by rust-bindgen */
+
+
+#![allow(non_snake_case)]
+
+
+extern "C" {
+    #[link_name = "_Z5Test2v"]
+    pub fn Test2() -> ::std::os::raw::c_uint;
+}

libbindgen/tests/headers/template_function_with_auto.hpp

@@ -0,0 +1,9 @@
+// bindgen-flags: -- -std=c++14
+
+template<typename T> auto Test1() {
+  return T(1);
+}
+
+auto Test2() {
+  return Test1<unsigned int>();
+}