2 # This file is part of the GROMACS molecular simulation package.
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35 include(CheckCXXSourceCompiles)
38 # Check whether both a suitable C++11-compatible compiler and standard
39 # library is available, and give a fatal error if not.
41 # Any required compiler flag for C++11 support is returned in
42 # ${FLAG}. The other parameters are only inputs, naming variables that
43 # contain flags that may have been detected, or set by the user.
44 function(GMX_TEST_CXX11 CXX11_CXX_FLAG_NAME STDLIB_CXX_FLAG_NAME STDLIB_LIBRARIES_NAME)
46 # First check that the compiler is OK, and find the appropriate flag.
48 if(WIN32 AND NOT MINGW)
49 set(CXX11_CXX_FLAG "/Qstd=c++11")
51 set(CXX11_CXX_FLAG "-std=gnu++11") #required for strdup
53 set(CXX11_CXX_FLAG "-std=c++11")
55 CHECK_CXX_COMPILER_FLAG("${CXX11_CXX_FLAG}" CXXFLAG_STD_CXX0X)
56 if(NOT CXXFLAG_STD_CXX0X)
57 set(CXX11_CXX_FLAG "")
59 set(CMAKE_REQUIRED_FLAGS "${CXX11_CXX_FLAG}")
60 check_cxx_source_compiles(
61 "// Permit testing typeid keyword
63 // Test that a subclass has a proper copy constructor
75 // ICC requires that a suitable GCC is available. It is using its standard library and emulates
76 // GCC behaviour based on its version. Relevant here it emulates the implementation of the move
77 // constructor. This compiler check should only fail based on the compiler not GCC. The GCC version
78 // is checked by the following STL check. It is known that all ICC>=15 have the proper move
79 // constructor. Thus this check is disabled for ICC.
80 #if !((defined __INTEL_COMPILER && __INTEL_COMPILER >= 1500) || (defined __ICL && __ICL >= 1500))
81 // Test that a subclass has a proper move constructor
94 // Test that operator bool() works
95 explicit operator bool() {return true;}
96 // Test that an in-class initializer works
98 // Test that a default constructor is generated
101 // Test that constexpr works
102 constexpr int factorial(int n)
104 return n <= 1? 1 : (n * factorial(n - 1));
106 // Test that r-value references work
107 void checkRvalueReference(int &&);
108 // Test that extern templates work
109 template <typename T> void someFunction();
110 extern template void someFunction<int>();
111 // Test using statement
113 // Test template using statement
114 template<class T> using myPointer = T*;
119 (void)x; // Suppressing unused variable warning
120 // Test range-based for loops
121 int array[5] = { 1, 2, 3, 4, 5 };
125 alignas(4*sizeof(int)) int y;
127 const std::type_info &intType = typeid(int);
128 // Test static assertions do compile
129 static_assert(true, \"if you see this, true somehow isn't\");
133 if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
134 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.8.1")
135 message(FATAL_ERROR "GROMACS requires version 4.8.1 or later of the GNU C++ compiler for complete C++11 support")
137 elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
138 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "3.3")
139 message(FATAL_ERROR "GROMACS requires version 3.3 or later of the Clang C++ compiler for complete C++11 support")
141 elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
142 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "15.0")
143 message(FATAL_ERROR "GROMACS requires version 15.0 or later of the Intel C++ compiler for complete C++11 support")
145 elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
146 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "19.0.23026")
147 message(FATAL_ERROR "GROMACS requires version 2015 (19.0.23026) or later of the MSVC C++ compiler for complete C++11 support")
151 set(${CXX11_CXX_FLAG_NAME} ${CXX11_CXX_FLAG} PARENT_SCOPE)
153 message(FATAL_ERROR "This version of GROMACS requires a C++11 compiler. Please use a newer compiler or use the GROMACS 5.1.x release. See the installation guide for details.")
156 # Now check the standard library is OK
158 set(CMAKE_REQUIRED_FLAGS "${CXX11_CXX_FLAG} ${${STDLIB_CXX_FLAG_NAME}}")
159 set(CMAKE_REQUIRED_LIBRARIES "${${STDLIB_LIBRARIES_NAME}} ${CMAKE_THREAD_LIBS_INIT}")
160 check_cxx_source_compiles(
161 "#include <algorithm>
168 #include <type_traits>
174 // Test for std::vector
175 std::vector<double> doubles(100);
176 // Test for std::array
177 std::array<int, 3> someInts;
178 // Test std::for_each and a lambda
179 std::for_each(std::begin(doubles), std::end(doubles), [&](double &d) { d = 2.3; });
180 // Test std::unique_ptr
181 typedef std::unique_ptr<int> intPointer;
182 // Test using std::unique_ptr
183 intPointer p(new int(10));
185 std::map<int, std::unique_ptr<int>> m;
186 // Test std::make_pair
187 m.insert(std::make_pair(5, std::move(p)));
188 // Test std::chrono (was missing before gcc 4.8.1)
189 auto start = std::chrono::steady_clock::now();
190 if (std::chrono::steady_clock::now() - start < std::chrono::seconds(2))
196 static_assert(std::is_pod<int>::value, \"int isn't pod\");
198 auto theTuple = std::make_tuple<int, double>(3, 4.2);
202 std::tie(tupleInt, tupleDouble) = theTuple;
204 std::string message(\"hello\");
205 }" CXX11_STDLIB_PRESENT)
206 if(NOT CXX11_STDLIB_PRESENT)
207 if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "16.0.3")
208 message(FATAL_ERROR "GROMACS requires that the Intel C++ compiler use a compatible C++ standard library, for complete C++11 support, however not all compiler versions support all possible standard library implementations. In particular, before icc version 16.0.3, the gcc version 5 standard library was not supported. If you are affected by such a case you should probably update your compiler version. Consult the GROMACS installation guide to check exactly what is supported and how to direct the use of a standard library from an older gcc version (but at least version 4.8.1 is needed).")
210 message(FATAL_ERROR "This version of GROMACS requires C++11-compatible standard library. Please use a newer compiler, and/or a newer standard library, or use the GROMACS 5.1.x release. Consult the installation guide for details before upgrading components.")