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 # ${FLAG}. The other parameters are only inputs, naming variables that
42 # contain flags that may have been detected, or set by the user.
43 function(GMX_TEST_CXX11 CXX11_CXX_FLAG_NAME STDLIB_CXX_FLAG_NAME STDLIB_LIBRARIES_NAME)
45 # First check that the compiler is OK, and find the appropriate flag.
47 if(WIN32 AND NOT MINGW)
48 set(CXX11_CXX_FLAG "/Qstd=c++0x")
50 set(CXX11_CXX_FLAG "-std=gnu++0x") #required for strdup
52 set(CXX11_CXX_FLAG "-std=c++0x")
54 CHECK_CXX_COMPILER_FLAG("${CXX11_CXX_FLAG}" CXXFLAG_STD_CXX0X)
55 if(NOT CXXFLAG_STD_CXX0X)
56 set(CXX11_CXX_FLAG "")
58 set(CMAKE_REQUIRED_FLAGS "${CXX11_CXX_FLAG}")
59 check_cxx_source_compiles(
60 "// Test that a subclass has a proper copy constructor
72 // Early patch versions of icc 16 (and perhaps earlier versions)
73 // have an issue with this test, but the GROMACS tests pass,
74 // so we disable this test in that sub-case.
75 #if (defined __INTEL_COMPILER && __INTEL_COMPILER >= 1700) || (defined __ICL && __ICL >= 1700) || (defined __INTEL_COMPILER_UDPATE && __INTEL_COMPILER_UPDATE >= 3)
76 // Test that a subclass has a proper move constructor
88 // Test that operator bool() works
90 explicit operator bool() {return true;}
92 // Test that constexpr works
93 constexpr int factorial(int n)
95 return n <= 1? 1 : (n * factorial(n - 1));
97 // Test that r-value references work
98 void checkRvalueReference(int &&);
99 // Test that extern templates work
100 template <typename T> void someFunction();
101 extern template void someFunction<int>();
105 // Test range-based for loops
106 int array[5] = { 1, 2, 3, 4, 5 };
111 set(${CXX11_CXX_FLAG_NAME} ${CXX11_CXX_FLAG} PARENT_SCOPE)
113 message(FATAL_ERROR "This version of GROMACS requires a C++11 compiler. Please use a newer compiler or use the GROMACS 5.1.x release. See the installation guide for details.")
116 # Now check the standard library is OK
118 set(CMAKE_REQUIRED_FLAGS "${CXX11_CXX_FLAG} ${${STDLIB_CXX_FLAG_NAME}}")
119 set(CMAKE_REQUIRED_LIBRARIES "${${STDLIB_LIBRARIES_NAME}}")
120 check_cxx_source_compiles(
127 typedef std::unique_ptr<int> intPointer;
128 intPointer p(new int(10));
129 std::map<int, std::unique_ptr<int>> m;
130 m.insert(std::make_pair(5, std::move(p)));
131 auto start = std::chrono::system_clock::now();
132 if (std::chrono::system_clock::now() - start < std::chrono::seconds(2))
136 }" CXX11_STDLIB_PRESENT)
137 if(NOT CXX11_STDLIB_PRESENT)
138 message(FATAL_ERROR "This version of GROMACS requires C++11-compatible standard library. Please use a newer compiler, or a newer standard library, or use the GROMACS 5.1.x release. See the installation guide for details.")