File: cxx11.cmake

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macro(use_cxx11)
  if(CMAKE_CXX_STANDARD EQUAL 98)
    message(FATAL_ERROR "C++ standard was set to ${CMAKE_CXX_STANDARD} but 11 is required as minimum")
  endif()
  if(USE_BOOST AND USE_BOOST_INT128)
    # Boost.Math requires C++14
    if(CMAKE_CXX_STANDARD LESS 14)
      message(FATAL_ERROR "C++ standard was set to ${CMAKE_CXX_STANDARD} but 14 is required as minimum")
    endif()
    set(CMAKE_CXX_STANDARD 14 CACHE STRING "C++ standard to use")
  else()
    set(CMAKE_CXX_STANDARD 11 CACHE STRING "C++ standard to use")
  endif()
endmacro()