Add proper build system

src/libclang/libclang_parser.cpp

@@ -30,8 +30,8 @@ const std::vector<std::string>& detail::libclang_compile_config_access::flags(
 
 libclang_compile_config::libclang_compile_config() : compile_config({})
 {
-    set_clang_binary("clang++");
-    add_include_dir(LIBCLANG_SYSTEM_INCLUDE_DIR);
+    set_clang_binary(CPPAST_CLANG_BINARY);
+    add_include_dir(CPPAST_LIBCLANG_SYSTEM_INCLUDE_DIR);
 }
 
 void libclang_compile_config::do_set_flags(cpp_standard                      standard,

src/libclang/parse_functions.cpp

@@ -80,7 +80,7 @@ std::unique_ptr<cpp_entity> detail::parse_entity(const detail::parse_context& co
     case CXCursor_UnexposedDecl:
         // go through all the try_parse_XXX functions
         if (auto entity = try_parse_cpp_language_linkage(context, cur))
-            return std::move(entity);
+            return entity;
         break;
 
     case CXCursor_Namespace:

src/libclang/type_parser.cpp

@@ -154,7 +154,7 @@ namespace
     std::unique_ptr<cpp_type> make_cv_qualified(std::unique_ptr<cpp_type> entity, cpp_cv cv)
     {
         if (cv == cpp_cv_none)
-            return std::move(entity);
+            return entity;
         return cpp_cv_qualified_type::build(std::move(entity), cv);
     }
 
@@ -285,7 +285,7 @@ namespace
     std::unique_ptr<cpp_type> make_ref_qualified(std::unique_ptr<cpp_type> type, cpp_reference ref)
     {
         if (ref == cpp_ref_none)
-            return std::move(type);
+            return type;
         return cpp_reference_type::build(std::move(type), ref);
     }