| // Copyright 2020 The Pigweed Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| // use this file except in compliance with the License. You may obtain a copy of |
| // the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| // License for the specific language governing permissions and limitations under |
| // the License. |
| #pragma once |
| |
| // libc++ uses a special namespace for standard library headers. Use this |
| // namespace via the defines in <__config>. |
| #if defined(_LIBCPP_VERSION) && __has_include(<__config>) |
| |
| #include <__config> |
| |
| #define _PW_POLYFILL_BEGIN_NAMESPACE_STD _LIBCPP_BEGIN_NAMESPACE_STD |
| #define _PW_POLYFILL_END_NAMESPACE_STD _LIBCPP_END_NAMESPACE_STD |
| |
| #else // Directly use the std namespace in GCC. |
| |
| #define _PW_POLYFILL_BEGIN_NAMESPACE_STD namespace std { |
| #define _PW_POLYFILL_END_NAMESPACE_STD } // namespace std |
| |
| // Cannot compile when using libc++ without the <__config> header. |
| #ifdef _LIBCPP_VERSION |
| static_assert( |
| false, |
| "Compiling against libc++, but the <__config> header is not available. " |
| "The <__config> header provides various _LIBCPP defines used internally " |
| "by libc++. pw_polyfill needs this header for the " |
| "_LIBCPP_BEGIN_NAMESPACE_STD and _LIBCPP_END_NAMESPACE_STD macros, which " |
| "specify the namespace to use for the standard library. " |
| "" |
| "If you see this message, you may be compiling with Clang, but without " |
| "libc++, in which case a fake <__config> header should be provided. " |
| "Alternately, libc++ may have been updated and no longer provides " |
| "<__config>, in which this file should be updated to properly " |
| "set _PW_POLYFILL_BEGIN_NAMESPACE_STD and _PW_POLYFILL_END_NAMESPACE_STD."); |
| |
| #endif // _LIBCPP_VERSION |
| |
| #endif // defined(_LIBCPP_VERSION) && __has_include(<__config>) |