GYP generator for GN

tools/gn/build_settings.cc

Index: tools/gn/build_settings.cc
diff --git a/tools/gn/build_settings.cc b/tools/gn/build_settings.cc
index b6ae49cf6c1372a86d5e41fe50e59cda6adddb82..2ac7389eea7647a58eaf63ee239f6f0184ed37cc 100644
--- a/tools/gn/build_settings.cc
+++ b/tools/gn/build_settings.cc
@@ -13,6 +13,22 @@ BuildSettings::BuildSettings()
       toolchain_manager_(this) {
 }
 
+BuildSettings::BuildSettings(const BuildSettings& other)
+    : root_path_(other.root_path_),
+      root_path_utf8_(other.root_path_utf8_),
+      secondary_source_path_(other.secondary_source_path_),
+      using_external_generator_(other.using_external_generator_),
+      python_path_(other.python_path_),
+      build_config_file_(other.build_config_file_),
+      build_dir_(other.build_dir_),
+      build_to_source_dir_string_(other.build_to_source_dir_string_),
+      build_args_(other.build_args_),
+      target_resolved_callback_(),  // Don't copy.
+      item_tree_(),
+      target_manager_(this),
+      toolchain_manager_(this) {
+}
+
 BuildSettings::~BuildSettings() {
 }