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 "${CXX11_CXX_FLAG}")
59 check_cxx_source_compiles(
61 explicit operator bool() {return true;}
70 constexpr int factorial(int n)
72 return n <= 1? 1 : (n * factorial(n - 1));
74 void checkRvalueReference(int &&);
75 template <typename T> void someFunction();
76 extern template void someFunction<int>();
79 int array[5] = { 1, 2, 3, 4, 5 };
84 set(${CXX11_CXX_FLAG_NAME} ${CXX11_CXX_FLAG} PARENT_SCOPE)
86 message(FATAL_ERROR "This version of GROMACS requires a C++11 compiler. Please use a newer compiler or use the GROMACS 5.1.x release. See the installation guide for details.")
89 # Now check the standard library is OK
91 set(CMAKE_REQUIRED_FLAGS "${CXX11_CXX_FLAG} ${${STDLIB_CXX_FLAG_NAME}}")
92 set(CMAKE_REQUIRED_LIBRARIES "${${STDLIB_LIBRARIES_NAME}}")
93 check_cxx_source_compiles(
98 typedef std::unique_ptr<int> intPointer;
99 intPointer p(new int(10));
100 std::map<int, std::unique_ptr<int>> m;
101 m.insert(std::make_pair(5, std::move(p)));
102 }" CXX11_STDLIB_PRESENT)
103 if(NOT CXX11_STDLIB_PRESENT)
104 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.")