| // Copyright 2020 The SwiftShader Authors. All Rights Reserved. |
| // |
| // 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 |
| // |
| // http://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. |
| |
| #if defined(_MSVC_LANG) |
| # define CPP_VERSION _MSVC_LANG |
| #elif defined(__cplusplus) |
| // Note: This must come after checking for _MSVC_LANG. |
| // See https://developercommunity.visualstudio.com/content/problem/139261/msvc-incorrectly-defines-cplusplus.html |
| # define CPP_VERSION __cplusplus |
| #endif |
| |
| #if !defined(CPP_VERSION) || CPP_VERSION <= 1 |
| # error "Unable to identify C++ language version" |
| #endif |
| |
| // The template and unused function below verifies the compiler is using at least |
| // C++17. It will print an error message containing the actual C++ version if |
| // the version is < 17. |
| |
| namespace { |
| |
| template<int version> |
| class cpp |
| { |
| static_assert(version >= 2017, "SwiftShader requires at least C++17"); |
| }; |
| |
| void check_cpp_version() |
| { |
| cpp<CPP_VERSION / 100>(); |
| (void)&check_cpp_version; // Unused reference to avoid unreferenced function warning. |
| } |
| |
| } // namespace |
