cmlib/CMLibHighPrecisionMath.cmake

function(enable_high_precision_math)
  set(options QUAD MPFR)
  set(oneValueArgs)
  set(multiValueArgs)

  cmake_parse_arguments(_PREFIX "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})

  if(_PREFIX_MPFR AND _PREFIX_QUAD)
    message(FATAL_ERROR "Mutually exclusive options QUAD and MPFR")
  endif()

  if(_PREFIX_MPFR)
    find_package(MPFR)
    if(MPFR_FOUND)
      find_package(MPFRCppThirdparty)
    endif()
    return()
  endif()

  if(_PREFIX_QUAD)
    find_package(Quadmath)
    if(QUADMATH_FOUND)
      add_definitions(-DHAVE_QUADMATH=1)
    endif()
    return()
  endif()

  # Default
  find_package(Quadmath)
  if(QUADMATH_FOUND)
    add_definitions(-DHAVE_QUADMATH=1)
  else()
    find_package(MPFR)
    if(MPFR_FOUND)
      find_package(MPFRCppThirdparty)
    else()
      message(FATAL_ERROR "Nor Quadmath, nor MPFR found.")
    endif()
  endif()
endfunction()