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# - Finds if the compiler has C++11 support
# This module can be used to detect compiler flags for using C++11, and checks
# a small subset of the language.
#
# The following variables are set:
# CXX11_FLAGS - flags to add to the CXX compiler for C++11 support
# CXX11_FOUND - true if the compiler supports C++11
#
# TODO: When compilers starts implementing the whole C++11, check the full set
include(CheckCXXSourceCompiles)
include(FindPackageHandleStandardArgs)
set(CXX11_FLAG_CANDIDATES
# Eveerything that automatically accepts C++11
" "
# gcc, clang and Intel Linux
"-std=c++11"
# Intel windows
"/Qstd=c++0x"
"/Qstd=c++11"
)
set(CXX11_TEST_SOURCE
"
#if defined(_MSC_VER)
#if _MSC_VER < 1800
#error \"Can not compile with C++11\"
#endif
#elif __cplusplus < 201103L
#error \"Can not compile with C++11\"
#endif
int main()
{}
")
foreach(FLAG ${CXX11_FLAG_CANDIDATES})
set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
set(CMAKE_REQUIRED_FLAGS "${FLAG}")
unset(CXX11_FLAG_DETECTED CACHE)
message(STATUS "Try C++11 flag = [${FLAG}]")
check_cxx_source_compiles("${CXX11_TEST_SOURCE}" CXX11_FLAG_DETECTED)
set(CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}")
if(CXX11_FLAG_DETECTED)
set(CXX11_FLAGS_INTERNAL "${FLAG}")
break()
endif(CXX11_FLAG_DETECTED)
endforeach(FLAG ${CXX11_FLAG_CANDIDATES})
set(CXX11_FLAGS "${CXX11_FLAGS_INTERNAL}")
find_package_handle_standard_args(CXX11 DEFAULT_MSG CXX11_FLAGS)
mark_as_advanced(CXX11_FLAGS)
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