policy_checks.h
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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 #ifndef ABSL_BASE_POLICY_CHECKS_H_
25 #define ABSL_BASE_POLICY_CHECKS_H_
26 
27 // Included for the __GLIBC_PREREQ macro used below.
28 #include <limits.h>
29 
30 // Included for the _STLPORT_VERSION macro used below.
31 #if defined(__cplusplus)
32 #include <cstddef>
33 #endif
34 
35 // -----------------------------------------------------------------------------
36 // Operating System Check
37 // -----------------------------------------------------------------------------
38 
39 #if defined(__CYGWIN__)
40 #error "Cygwin is not supported."
41 #endif
42 
43 // -----------------------------------------------------------------------------
44 // Compiler Check
45 // -----------------------------------------------------------------------------
46 
47 // We support MSVC++ 14.0 update 2 and later.
48 // This minimum will go up.
49 #if defined(_MSC_FULL_VER) && _MSC_FULL_VER < 190023918 && !defined(__clang__)
50 #error "This package requires Visual Studio 2015 Update 2 or higher."
51 #endif
52 
53 // We support gcc 4.7 and later.
54 // This minimum will go up.
55 #if defined(__GNUC__) && !defined(__clang__)
56 #if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
57 #error "This package requires gcc 4.7 or higher."
58 #endif
59 #endif
60 
61 // We support Apple Xcode clang 4.2.1 (version 421.11.65) and later.
62 // This corresponds to Apple Xcode version 4.5.
63 // This minimum will go up.
64 #if defined(__apple_build_version__) && __apple_build_version__ < 4211165
65 #error "This package requires __apple_build_version__ of 4211165 or higher."
66 #endif
67 
68 // -----------------------------------------------------------------------------
69 // C++ Version Check
70 // -----------------------------------------------------------------------------
71 
72 // Enforce C++11 as the minimum. Note that Visual Studio has not
73 // advanced __cplusplus despite being good enough for our purposes, so
74 // so we exempt it from the check.
75 #if defined(__cplusplus) && !defined(_MSC_VER)
76 #if __cplusplus < 201103L
77 #error "C++ versions less than C++11 are not supported."
78 #endif
79 #endif
80 
81 // -----------------------------------------------------------------------------
82 // Standard Library Check
83 // -----------------------------------------------------------------------------
84 
85 // We have chosen glibc 2.12 as the minimum as it was tagged for release
86 // in May, 2010 and includes some functionality used in Google software
87 // (for instance pthread_setname_np):
88 // https://sourceware.org/ml/libc-alpha/2010-05/msg00000.html
89 #if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
90 #if !__GLIBC_PREREQ(2, 12)
91 #error "Minimum required version of glibc is 2.12."
92 #endif
93 #endif
94 
95 #if defined(_STLPORT_VERSION)
96 #error "STLPort is not supported."
97 #endif
98 
99 // -----------------------------------------------------------------------------
100 // `char` Size Check
101 // -----------------------------------------------------------------------------
102 
103 // Abseil currently assumes CHAR_BIT == 8. If you would like to use Abseil on a
104 // platform where this is not the case, please provide us with the details about
105 // your platform so we can consider relaxing this requirement.
106 #if CHAR_BIT != 8
107 #error "Abseil assumes CHAR_BIT == 8."
108 #endif
109 
110 // -----------------------------------------------------------------------------
111 // `int` Size Check
112 // -----------------------------------------------------------------------------
113 
114 // Abseil currently assumes that an int is 4 bytes. If you would like to use
115 // Abseil on a platform where this is not the case, please provide us with the
116 // details about your platform so we can consider relaxing this requirement.
117 #if INT_MAX < 2147483647
118 #error "Abseil assumes that int is at least 4 bytes. "
119 #endif
120 
121 #endif // ABSL_BASE_POLICY_CHECKS_H_


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autogenerated on Mon Feb 28 2022 21:31:19