| 1 | // Copyright 2017 The Abseil Authors. |
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| 2 | // |
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| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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| 4 | // you may not use this file except in compliance with the License. |
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| 5 | // You may obtain a copy of the License at |
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| 6 | // |
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| 7 | // https://www.apache.org/licenses/LICENSE-2.0 |
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| 8 | // |
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| 9 | // Unless required by applicable law or agreed to in writing, software |
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| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 12 | // See the License for the specific language governing permissions and |
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| 13 | // limitations under the License. |
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| 14 | // |
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| 15 | // ----------------------------------------------------------------------------- |
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| 16 | // File: policy_checks.h |
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| 17 | // ----------------------------------------------------------------------------- |
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| 18 | // |
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| 19 | // This header enforces a minimum set of policies at build time, such as the |
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| 20 | // supported compiler and library versions. Unsupported configurations are |
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| 21 | // reported with `#error`. This enforcement is best effort, so successfully |
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| 22 | // compiling this header does not guarantee a supported configuration. |
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| 23 | |
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| 24 | #ifndef ABSL_BASE_POLICY_CHECKS_H_ |
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| 25 | #define ABSL_BASE_POLICY_CHECKS_H_ |
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| 26 | |
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| 27 | // Included for the __GLIBC_PREREQ macro used below. |
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| 28 | #include <limits.h> |
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| 29 | |
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| 30 | // Included for the _STLPORT_VERSION macro used below. |
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| 31 | #if defined(__cplusplus) |
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| 32 | #include <cstddef> |
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| 33 | #endif |
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| 34 | |
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| 35 | // ----------------------------------------------------------------------------- |
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| 36 | // Operating System Check |
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| 37 | // ----------------------------------------------------------------------------- |
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| 38 | |
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| 39 | #if defined(__CYGWIN__) |
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| 40 | #error "Cygwin is not supported." |
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| 41 | #endif |
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| 42 | |
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| 43 | // ----------------------------------------------------------------------------- |
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| 44 | // Toolchain Check |
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| 45 | // ----------------------------------------------------------------------------- |
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| 46 | |
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| 47 | // We support MSVC++ 14.0 update 2 and later. |
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| 48 | // This minimum will go up. |
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| 49 | #if defined(_MSC_FULL_VER) && _MSC_FULL_VER < 190023918 && !defined(__clang__) |
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| 50 | #error "This package requires Visual Studio 2015 Update 2 or higher." |
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| 51 | #endif |
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| 52 | |
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| 53 | // We support gcc 4.7 and later. |
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| 54 | // This minimum will go up. |
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| 55 | #if defined(__GNUC__) && !defined(__clang__) |
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| 56 | #if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) |
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| 57 | #error "This package requires gcc 4.7 or higher." |
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| 58 | #endif |
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| 59 | #endif |
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| 60 | |
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| 61 | // We support Apple Xcode clang 4.2.1 (version 421.11.65) and later. |
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| 62 | // This corresponds to Apple Xcode version 4.5. |
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| 63 | // This minimum will go up. |
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| 64 | #if defined(__apple_build_version__) && __apple_build_version__ < 4211165 |
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| 65 | #error "This package requires __apple_build_version__ of 4211165 or higher." |
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| 66 | #endif |
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| 67 | |
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| 68 | // ----------------------------------------------------------------------------- |
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| 69 | // C++ Version Check |
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| 70 | // ----------------------------------------------------------------------------- |
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| 71 | |
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| 72 | // Enforce C++11 as the minimum. Note that Visual Studio has not |
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| 73 | // advanced __cplusplus despite being good enough for our purposes, so |
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| 74 | // so we exempt it from the check. |
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| 75 | #if defined(__cplusplus) && !defined(_MSC_VER) |
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| 76 | #if __cplusplus < 201103L |
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| 77 | #error "C++ versions less than C++11 are not supported." |
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| 78 | #endif |
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| 79 | #endif |
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| 80 | |
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| 81 | // ----------------------------------------------------------------------------- |
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| 82 | // Standard Library Check |
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| 83 | // ----------------------------------------------------------------------------- |
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| 84 | |
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| 85 | #if defined(_STLPORT_VERSION) |
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| 86 | #error "STLPort is not supported." |
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| 87 | #endif |
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| 88 | |
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| 89 | // ----------------------------------------------------------------------------- |
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| 90 | // `char` Size Check |
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| 91 | // ----------------------------------------------------------------------------- |
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| 92 | |
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| 93 | // Abseil currently assumes CHAR_BIT == 8. If you would like to use Abseil on a |
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| 94 | // platform where this is not the case, please provide us with the details about |
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| 95 | // your platform so we can consider relaxing this requirement. |
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| 96 | #if CHAR_BIT != 8 |
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| 97 | #error "Abseil assumes CHAR_BIT == 8." |
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| 98 | #endif |
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| 99 | |
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| 100 | // ----------------------------------------------------------------------------- |
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| 101 | // `int` Size Check |
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| 102 | // ----------------------------------------------------------------------------- |
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| 103 | |
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| 104 | // Abseil currently assumes that an int is 4 bytes. If you would like to use |
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| 105 | // Abseil on a platform where this is not the case, please provide us with the |
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| 106 | // details about your platform so we can consider relaxing this requirement. |
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| 107 | #if INT_MAX < 2147483647 |
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| 108 | #error "Abseil assumes that int is at least 4 bytes. " |
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| 109 | #endif |
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| 110 | |
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| 111 | #endif // ABSL_BASE_POLICY_CHECKS_H_ |
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| 112 | |
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