text: // Copyright (c) 2013 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #include "gn/config_values.h"
  
  namespace {
  
  template <typename T>
  void VectorAppend(std::vector<T>* append_to,
                    const std::vector<T>& append_this) {
    if (append_this.empty())
      return;
    append_to->insert(append_to->end(), append_this.begin(), append_this.end());
  }
  
  }  // namespace
  
  ConfigValues::ConfigValues() = default;
  
  ConfigValues::~ConfigValues() = default;
  
  void ConfigValues::AppendValues(const ConfigValues& append) {
    VectorAppend(&asmflags_, append.asmflags_);
    VectorAppend(&arflags_, append.arflags_);
    VectorAppend(&cflags_, append.cflags_);
    VectorAppend(&cflags_c_, append.cflags_c_);
    VectorAppend(&cflags_cc_, append.cflags_cc_);
    VectorAppend(&cflags_objc_, append.cflags_objc_);
    VectorAppend(&cflags_objcc_, append.cflags_objcc_);
    VectorAppend(&defines_, append.defines_);
    VectorAppend(&frameworks_, append.frameworks_);
    VectorAppend(&framework_dirs_, append.framework_dirs_);
    VectorAppend(&include_dirs_, append.include_dirs_);
    VectorAppend(&inputs_, append.inputs_);
    VectorAppend(&ldflags_, append.ldflags_);
    VectorAppend(&lib_dirs_, append.lib_dirs_);
    VectorAppend(&libs_, append.libs_);
    VectorAppend(&rustflags_, append.rustflags_);
    VectorAppend(&rustenv_, append.rustenv_);
  
    // Only append precompiled header if there isn't one. It might be nice to
    // throw an error if there are conflicting precompiled headers, but that
    // requires piping through some context of the actual configs involved, and
    // conflicts here should be very unusual. Instead, use the first value.
    if (!append.precompiled_header_.empty() && !precompiled_header_.empty())
      precompiled_header_ = append.precompiled_header_;
    if (!append.precompiled_source_.is_null() && !precompiled_source_.is_null())
      precompiled_source_ = append.precompiled_source_;
  }
  