2 # This file is part of the GROMACS molecular simulation package.
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35 include(CheckCXXSourceCompiles)
37 # Check whether both a suitable C++11-compatible compiler and standard
38 # library is available, and give a fatal error if not.
40 # Any required compiler flag for C++11 support is returned in
41 # ${FLAG}. The other parameters are only inputs, naming variables that
42 # contain flags that may have been detected, or set by the user.
43 function(GMX_TEST_CXX11 CXX11_CXX_FLAG_NAME STDLIB_CXX_FLAG_NAME STDLIB_LIBRARIES_NAME)
45 # First check that the compiler is OK, and find the appropriate flag.
47 if(WIN32 AND NOT MINGW)
48 set(CXX11_CXX_FLAG "/Qstd=c++11")
50 set(CXX11_CXX_FLAG "-std=gnu++11") #required for strdup
52 set(CXX11_CXX_FLAG "-std=c++11")
54 CHECK_CXX_COMPILER_FLAG("${CXX11_CXX_FLAG}" CXXFLAG_STD_CXX0X)
55 if(NOT CXXFLAG_STD_CXX0X)
56 set(CXX11_CXX_FLAG "")
58 set(CMAKE_REQUIRED_FLAGS "${CXX11_CXX_FLAG}")
59 check_cxx_source_compiles(
60 "// Test that a subclass has a proper copy constructor
72 // ICC requires that a suitable GCC is available. It is using its standard library and emulates
73 // GCC behaviour based on its version. Relevant here it emulates the implementation of the move
74 // constructor. This compiler check should only fail based on the compiler not GCC. The GCC version
75 // is checked by the following STL check. It is known that all ICC>=15 have the proper move
76 // constructor. Thus this check is disabled for ICC.
77 #if !((defined __INTEL_COMPILER && __INTEL_COMPILER >= 1500) || (defined __ICL && __ICL >= 1500))
78 // Test that a subclass has a proper move constructor
90 // Test that operator bool() works
92 explicit operator bool() {return true;}
94 // Test that constexpr works
95 constexpr int factorial(int n)
97 return n <= 1? 1 : (n * factorial(n - 1));
99 // Test that r-value references work
100 void checkRvalueReference(int &&);
101 // Test that extern templates work
102 template <typename T> void someFunction();
103 extern template void someFunction<int>();
107 (void)x; // Suppressing unused variable warning
108 // Test range-based for loops
109 int array[5] = { 1, 2, 3, 4, 5 };
113 alignas(4*sizeof(int)) int y;
115 if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
116 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.8.1")
117 message(FATAL_ERROR "GROMACS requires version 4.8.1 or later of the GNU C++ compiler for complete C++11 support")
119 elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
120 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "3.3")
121 message(FATAL_ERROR "GROMACS requires version 3.3 or later of the Clang C++ compiler for complete C++11 support")
123 elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
124 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "15.0")
125 message(FATAL_ERROR "GROMACS requires version 15.0 or later of the Intel C++ compiler for complete C++11 support")
127 elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
128 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "19.0.23026")
129 message(FATAL_ERROR "GROMACS requires version 2015 (19.0.23026) or later of the MSVC C++ compiler for complete C++11 support")
133 set(${CXX11_CXX_FLAG_NAME} ${CXX11_CXX_FLAG} PARENT_SCOPE)
135 message(FATAL_ERROR "This version of GROMACS requires a C++11 compiler. Please use a newer compiler or use the GROMACS 5.1.x release. See the installation guide for details.")
138 # Now check the standard library is OK
140 set(CMAKE_REQUIRED_FLAGS "${CXX11_CXX_FLAG} ${${STDLIB_CXX_FLAG_NAME}}")
141 set(CMAKE_REQUIRED_LIBRARIES "${${STDLIB_LIBRARIES_NAME}}")
142 check_cxx_source_compiles(
149 typedef std::unique_ptr<int> intPointer;
150 intPointer p(new int(10));
151 std::map<int, std::unique_ptr<int>> m;
152 m.insert(std::make_pair(5, std::move(p)));
153 auto start = std::chrono::steady_clock::now();
154 if (std::chrono::steady_clock::now() - start < std::chrono::seconds(2))
158 }" CXX11_STDLIB_PRESENT)
159 if(NOT CXX11_STDLIB_PRESENT)
160 message(FATAL_ERROR "This version of GROMACS requires C++11-compatible standard library. Several compilers (e.g. Clang and Intel) use GCC. For those make sure to have GCC 4.8.1 or later. Please use a newer compiler, or a newer standard library, or use the GROMACS 5.1.x release. See the installation guide for details.")