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54 lines
2.0 KiB
54 lines
2.0 KiB
/*
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* Copyright (c) 2016 - present Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#pragma once
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// This is a hacky attempt to follow what folly does
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// https://github.com/facebook/folly/blob/b1eb6819f3ffe6b645f39d505ca8ace3116b7873/folly/configure.ac#L232
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// Depending whether the project is compiled with libc++ or stdlibc++, include their
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// internal config headers to get information about versions
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// clang-format off
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#if __has_include(<__config>) // defines _LIBCPP_VERSION
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#include <__config>
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#elif __has_include(<bits/c++config.h>) // defines __GLIBCXX__
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#include <bits/c++config.h>
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#endif
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// clang-format on
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// Figure out whether the library really supports c++11 standard
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#if __cplusplus >= 201103L
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#if __GLIBCXX__ >= 20130531
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// C++11 is really supported from gcc 4.8.1 onward.
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#define INFER_CPP11_ON 1
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#elif defined _LIBCPP_VERSION // for now assume libc++ always supported c++11
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#define INFER_CPP11_ON 1
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#endif
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#endif // __cplusplus >= 201103L
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#if !defined(INFER_USE_LIBCPP) && defined(_LIBCPP_VERSION)
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#define INFER_USE_LIBCPP 1
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#elif defined(FOLLY_USE_LIBCPP) // follow folly configuration if it's available
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#define INFER_USE_LIBCPP 1
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#endif
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// Follow what folly does - gnu libstdc++ implementation is different from
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// llvm's libc++. This way folly can forward declare decls from std library
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// even when they are infer models
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// https://github.com/facebook/folly/blob/b1eb6819f3ffe6b645f39d505ca8ace3116b7873/folly/Portability.h#L253-L255
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// On top of that, define platform-dependent STL iterators.
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#if INFER_USE_LIBCPP
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#include <__config>
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#define INFER_NAMESPACE_STD_BEGIN _LIBCPP_BEGIN_NAMESPACE_STD
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#define INFER_NAMESPACE_STD_END _LIBCPP_END_NAMESPACE_STD
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#define STD_ITER(T, C) __wrap_iter<T>
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#else
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#define INFER_NAMESPACE_STD_BEGIN namespace std {
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#define INFER_NAMESPACE_STD_END }
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#define STD_ITER(T, C) __gnu_cxx::__normal_iterator<T, C>
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#endif
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