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comparison 3rdparty/vmime/cmake/cmake-cxx11/Modules/CheckCXX11Features.cmake @ 0:a4671277546c tip

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created the repository for the thymian project
author ferencd
date Tue, 17 Aug 2021 11:19:54 +0200
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-1:000000000000 0:a4671277546c
1 # - Check which parts of the C++11 standard the compiler supports
2 #
3 # When found it will set the following variables
4 #
5 # CXX11_COMPILER_FLAGS - the compiler flags needed to get C++11 features
6 #
7 # HAS_CXX11_AUTO - auto keyword
8 # HAS_CXX11_AUTO_RET_TYPE - function declaration with deduced return types
9 # HAS_CXX11_CLASS_OVERRIDE - override and final keywords for classes and methods
10 # HAS_CXX11_CONSTEXPR - constexpr keyword
11 # HAS_CXX11_CSTDINT_H - cstdint header
12 # HAS_CXX11_DECLTYPE - decltype keyword
13 # HAS_CXX11_FUNC - __func__ preprocessor constant
14 # HAS_CXX11_INITIALIZER_LIST - initializer list
15 # HAS_CXX11_LAMBDA - lambdas
16 # HAS_CXX11_LIB_REGEX - regex library
17 # HAS_CXX11_LONG_LONG - long long signed & unsigned types
18 # HAS_CXX11_NULLPTR - nullptr
19 # HAS_CXX11_RVALUE_REFERENCES - rvalue references
20 # HAS_CXX11_SIZEOF_MEMBER - sizeof() non-static members
21 # HAS_CXX11_STATIC_ASSERT - static_assert()
22 # HAS_CXX11_VARIADIC_TEMPLATES - variadic templates
23
24 #=============================================================================
25 # Copyright 2011,2012 Rolf Eike Beer <eike@sf-mail.de>
26 # Copyright 2012 Andreas Weis
27 #
28 # Distributed under the OSI-approved BSD License (the "License");
29 # see accompanying file Copyright.txt for details.
30 #
31 # This software is distributed WITHOUT ANY WARRANTY; without even the
32 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
33 # See the License for more information.
34 #=============================================================================
35 # (To distribute this file outside of CMake, substitute the full
36 # License text for the above reference.)
37
38 #
39 # Each feature may have up to 3 checks, every one of them in it's own file
40 # FEATURE.cpp - example that must build and return 0 when run
41 # FEATURE_fail.cpp - example that must build, but may not return 0 when run
42 # FEATURE_fail_compile.cpp - example that must fail compilation
43 #
44 # The first one is mandatory, the latter 2 are optional and do not depend on
45 # each other (i.e. only one may be present).
46 #
47
48 if (NOT CMAKE_CXX_COMPILER_LOADED)
49 message(FATAL_ERROR "CheckCXX11Features modules only works if language CXX is enabled")
50 endif ()
51
52 cmake_minimum_required(VERSION 2.8.3)
53
54 #
55 ### Check for needed compiler flags
56 #
57 include(CheckCXXCompilerFlag)
58 check_cxx_compiler_flag("-std=c++11" _HAS_CXX11_FLAG)
59 if (NOT _HAS_CXX11_FLAG)
60 check_cxx_compiler_flag("-std=c++0x" _HAS_CXX0X_FLAG)
61 endif ()
62
63 if (_HAS_CXX11_FLAG)
64 set(CXX11_COMPILER_FLAGS "-std=c++11")
65 elseif (_HAS_CXX0X_FLAG)
66 set(CXX11_COMPILER_FLAGS "-std=c++0x")
67 endif ()
68
69 function(cxx11_check_feature FEATURE_NAME RESULT_VAR)
70 if (NOT DEFINED ${RESULT_VAR})
71 set(_bindir "${CMAKE_CURRENT_BINARY_DIR}/cxx11_${FEATURE_NAME}")
72
73 set(_SRCFILE_BASE ${CMAKE_CURRENT_LIST_DIR}/CheckCXX11Features/cxx11-test-${FEATURE_NAME})
74 set(_LOG_NAME "\"${FEATURE_NAME}\"")
75 message(STATUS "Checking C++11 support for ${_LOG_NAME}")
76
77 set(_SRCFILE "${_SRCFILE_BASE}.cpp")
78 set(_SRCFILE_FAIL "${_SRCFILE_BASE}_fail.cpp")
79 set(_SRCFILE_FAIL_COMPILE "${_SRCFILE_BASE}_fail_compile.cpp")
80
81 if (CROSS_COMPILING)
82 try_compile(${RESULT_VAR} "${_bindir}" "${_SRCFILE}"
83 COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
84 if (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL})
85 try_compile(${RESULT_VAR} "${_bindir}_fail" "${_SRCFILE_FAIL}"
86 COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
87 endif (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL})
88 else (CROSS_COMPILING)
89 try_run(_RUN_RESULT_VAR _COMPILE_RESULT_VAR
90 "${_bindir}" "${_SRCFILE}"
91 COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
92 if (_COMPILE_RESULT_VAR AND NOT _RUN_RESULT_VAR)
93 set(${RESULT_VAR} TRUE)
94 else (_COMPILE_RESULT_VAR AND NOT _RUN_RESULT_VAR)
95 set(${RESULT_VAR} FALSE)
96 endif (_COMPILE_RESULT_VAR AND NOT _RUN_RESULT_VAR)
97 if (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL})
98 try_run(_RUN_RESULT_VAR _COMPILE_RESULT_VAR
99 "${_bindir}_fail" "${_SRCFILE_FAIL}"
100 COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
101 if (_COMPILE_RESULT_VAR AND _RUN_RESULT_VAR)
102 set(${RESULT_VAR} TRUE)
103 else (_COMPILE_RESULT_VAR AND _RUN_RESULT_VAR)
104 set(${RESULT_VAR} FALSE)
105 endif (_COMPILE_RESULT_VAR AND _RUN_RESULT_VAR)
106 endif (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL})
107 endif (CROSS_COMPILING)
108 if (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL_COMPILE})
109 try_compile(_TMP_RESULT "${_bindir}_fail_compile" "${_SRCFILE_FAIL_COMPILE}"
110 COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
111 if (_TMP_RESULT)
112 set(${RESULT_VAR} FALSE)
113 else (_TMP_RESULT)
114 set(${RESULT_VAR} TRUE)
115 endif (_TMP_RESULT)
116 endif (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL_COMPILE})
117
118 if (${RESULT_VAR})
119 message(STATUS "Checking C++11 support for ${_LOG_NAME}: works")
120 else (${RESULT_VAR})
121 message(STATUS "Checking C++11 support for ${_LOG_NAME}: not supported")
122 endif (${RESULT_VAR})
123 set(${RESULT_VAR} ${${RESULT_VAR}} CACHE INTERNAL "C++11 support for ${_LOG_NAME}")
124 endif (NOT DEFINED ${RESULT_VAR})
125 endfunction(cxx11_check_feature)
126
127 cxx11_check_feature("__func__" HAS_CXX11_FUNC)
128 cxx11_check_feature("auto" HAS_CXX11_AUTO)
129 cxx11_check_feature("auto_ret_type" HAS_CXX11_AUTO_RET_TYPE)
130 cxx11_check_feature("class_override_final" HAS_CXX11_CLASS_OVERRIDE)
131 cxx11_check_feature("constexpr" HAS_CXX11_CONSTEXPR)
132 cxx11_check_feature("cstdint" HAS_CXX11_CSTDINT_H)
133 cxx11_check_feature("decltype" HAS_CXX11_DECLTYPE)
134 cxx11_check_feature("initializer_list" HAS_CXX11_INITIALIZER_LIST)
135 cxx11_check_feature("lambda" HAS_CXX11_LAMBDA)
136 cxx11_check_feature("long_long" HAS_CXX11_LONG_LONG)
137 cxx11_check_feature("nullptr" HAS_CXX11_NULLPTR)
138 cxx11_check_feature("regex" HAS_CXX11_LIB_REGEX)
139 cxx11_check_feature("rvalue-references" HAS_CXX11_RVALUE_REFERENCES)
140 cxx11_check_feature("sizeof_member" HAS_CXX11_SIZEOF_MEMBER)
141 cxx11_check_feature("static_assert" HAS_CXX11_STATIC_ASSERT)
142 cxx11_check_feature("variadic_templates" HAS_CXX11_VARIADIC_TEMPLATES)