fc8dc48020
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline:ffb2ae54begit-subtree-split:768eb2ca28
111 lines
4.2 KiB
C
111 lines
4.2 KiB
C
// 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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// Compiler Check
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// -----------------------------------------------------------------------------
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// We support MSVC++ 14.0 update 2 and later.
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// This minimum will go up.
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#if defined(_MSC_FULL_VER) && _MSC_FULL_VER < 190023918 && !defined(__clang__)
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#error "This package requires Visual Studio 2015 Update 2 or higher."
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#endif
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// We support gcc 4.7 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__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
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#error "This package requires gcc 4.7 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++11 as the minimum. Note that Visual Studio has not
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// advanced __cplusplus despite being good enough for our purposes, so
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// so we exempt it from the check.
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#if defined(__cplusplus) && !defined(_MSC_VER)
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#if __cplusplus < 201103L
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#error "C++ versions less than C++11 are not supported."
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#endif
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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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