Abseil Common Libraries (C++) (grcp 依赖)
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113 lines
4.2 KiB
113 lines
4.2 KiB
// Copyright 2017 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// |
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// ----------------------------------------------------------------------------- |
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// File: policy_checks.h |
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// ----------------------------------------------------------------------------- |
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// |
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// This header enforces a minimum set of policies at build time, such as the |
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// supported compiler and library versions. Unsupported configurations are |
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// reported with `#error`. This enforcement is best effort, so successfully |
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// compiling this header does not guarantee a supported configuration. |
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#ifndef ABSL_BASE_POLICY_CHECKS_H_ |
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#define ABSL_BASE_POLICY_CHECKS_H_ |
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// Included for the __GLIBC_PREREQ macro used below. |
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#include <limits.h> |
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// Included for the _STLPORT_VERSION macro used below. |
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#if defined(__cplusplus) |
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#include <cstddef> |
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#endif |
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// ----------------------------------------------------------------------------- |
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// Operating System Check |
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// ----------------------------------------------------------------------------- |
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#if defined(__CYGWIN__) |
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#error "Cygwin is not supported." |
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#endif |
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// ----------------------------------------------------------------------------- |
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// Toolchain Check |
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// ----------------------------------------------------------------------------- |
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// We support Visual Studio 2017 (MSVC++ 15.0) and later. |
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// This minimum will go up. |
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#if defined(_MSC_VER) && _MSC_VER < 1910 && !defined(__clang__) |
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#error "This package requires Visual Studio 2017 (MSVC++ 15.0) or higher." |
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#endif |
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// We support gcc 5 and later. |
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// This minimum will go up. |
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#if defined(__GNUC__) && !defined(__clang__) |
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#if __GNUC__ < 5 |
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#error "This package requires gcc 5 or higher." |
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#endif |
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#endif |
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// We support Apple Xcode clang 4.2.1 (version 421.11.65) and later. |
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// This corresponds to Apple Xcode version 4.5. |
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// This minimum will go up. |
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#if defined(__apple_build_version__) && __apple_build_version__ < 4211165 |
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#error "This package requires __apple_build_version__ of 4211165 or higher." |
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#endif |
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// ----------------------------------------------------------------------------- |
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// C++ Version Check |
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// ----------------------------------------------------------------------------- |
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// Enforce C++14 as the minimum. |
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#if defined(_MSVC_LANG) |
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#if _MSVC_LANG < 201402L |
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#error "C++ versions less than C++14 are not supported." |
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#endif // _MSVC_LANG < 201402L |
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#elif defined(__cplusplus) |
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#if __cplusplus < 201402L |
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#error "C++ versions less than C++14 are not supported." |
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#endif // __cplusplus < 201402L |
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#endif |
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// ----------------------------------------------------------------------------- |
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// Standard Library Check |
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// ----------------------------------------------------------------------------- |
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#if defined(_STLPORT_VERSION) |
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#error "STLPort is not supported." |
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#endif |
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// ----------------------------------------------------------------------------- |
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// `char` Size Check |
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// ----------------------------------------------------------------------------- |
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// Abseil currently assumes CHAR_BIT == 8. If you would like to use Abseil on a |
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// platform where this is not the case, please provide us with the details about |
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// your platform so we can consider relaxing this requirement. |
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#if CHAR_BIT != 8 |
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#error "Abseil assumes CHAR_BIT == 8." |
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#endif |
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// ----------------------------------------------------------------------------- |
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// `int` Size Check |
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// ----------------------------------------------------------------------------- |
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// Abseil currently assumes that an int is 4 bytes. If you would like to use |
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// Abseil on a platform where this is not the case, please provide us with the |
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// details about your platform so we can consider relaxing this requirement. |
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#if INT_MAX < 2147483647 |
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#error "Abseil assumes that int is at least 4 bytes. " |
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#endif |
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#endif // ABSL_BASE_POLICY_CHECKS_H_
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