1 // Copyright 2017 The Abseil Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 // ----------------------------------------------------------------------------- 16 // File: policy_checks.h 17 // ----------------------------------------------------------------------------- 18 // 19 // This header enforces a minimum set of policies at build time, such as the 20 // supported compiler and library versions. Unsupported configurations are 21 // reported with `#error`. This enforcement is best effort, so successfully 22 // compiling this header does not guarantee a supported configuration. 23 24 // SKIP_ABSL_INLINE_NAMESPACE_CHECK 25 26 #ifndef ABSL_BASE_POLICY_CHECKS_H_ 27 #define ABSL_BASE_POLICY_CHECKS_H_ 28 29 // Included for the __GLIBC_PREREQ macro used below. 30 #include <limits.h> 31 32 // Included for the _STLPORT_VERSION macro used below. 33 #if defined(__cplusplus) 34 #include <cstddef> 35 #endif 36 37 // ----------------------------------------------------------------------------- 38 // Operating System Check 39 // ----------------------------------------------------------------------------- 40 41 #if defined(__CYGWIN__) 42 #error "Cygwin is not supported." 43 #endif 44 45 // ----------------------------------------------------------------------------- 46 // Toolchain Check 47 // ----------------------------------------------------------------------------- 48 49 // We support Visual Studio 2019 (MSVC++ 16.0) and later. 50 // This minimum will go up. 51 #if defined(_MSC_VER) && _MSC_VER < 1920 && !defined(__clang__) 52 #error "This package requires Visual Studio 2019 (MSVC++ 16.0) or higher." 53 #endif 54 55 // We support GCC 7 and later. 56 // This minimum will go up. 57 #if defined(__GNUC__) && !defined(__clang__) 58 #if __GNUC__ < 7 59 #error "This package requires GCC 7 or higher." 60 #endif 61 #endif 62 63 // We support Apple Xcode clang 4.2.1 (version 421.11.65) and later. 64 // This corresponds to Apple Xcode version 4.5. 65 // This minimum will go up. 66 #if defined(__apple_build_version__) && __apple_build_version__ < 4211165 67 #error "This package requires __apple_build_version__ of 4211165 or higher." 68 #endif 69 70 // ----------------------------------------------------------------------------- 71 // C++ Version Check 72 // ----------------------------------------------------------------------------- 73 74 // Enforce C++14 as the minimum. 75 #if defined(_MSVC_LANG) 76 #if _MSVC_LANG < 201402L 77 #error "C++ versions less than C++14 are not supported." 78 #endif // _MSVC_LANG < 201402L 79 #elif defined(__cplusplus) 80 #if __cplusplus < 201402L 81 #error "C++ versions less than C++14 are not supported." 82 #endif // __cplusplus < 201402L 83 #endif 84 85 // ----------------------------------------------------------------------------- 86 // Standard Library Check 87 // ----------------------------------------------------------------------------- 88 89 #if defined(_STLPORT_VERSION) 90 #error "STLPort is not supported." 91 #endif 92 93 // ----------------------------------------------------------------------------- 94 // `char` Size Check 95 // ----------------------------------------------------------------------------- 96 97 // Abseil currently assumes CHAR_BIT == 8. If you would like to use Abseil on a 98 // platform where this is not the case, please provide us with the details about 99 // your platform so we can consider relaxing this requirement. 100 #if CHAR_BIT != 8 101 #error "Abseil assumes CHAR_BIT == 8." 102 #endif 103 104 // ----------------------------------------------------------------------------- 105 // `int` Size Check 106 // ----------------------------------------------------------------------------- 107 108 // Abseil currently assumes that an int is 4 bytes. If you would like to use 109 // Abseil on a platform where this is not the case, please provide us with the 110 // details about your platform so we can consider relaxing this requirement. 111 #if INT_MAX < 2147483647 112 #error "Abseil assumes that int is at least 4 bytes. " 113 #endif 114 115 #endif // ABSL_BASE_POLICY_CHECKS_H_ 116