cmake/FindFeature.cmake

   1
   2 # types: DISABLED < RUNTIME < OPTIONAL < RECOMMENDED < REQUIRED
   3
   4 macro(find_feature _feature _type _purpose _description)
   5
   6         string(TOUPPER ${_feature} _feature_upper)
   7         string(TOLOWER ${_type} _type_lower)
   8
   9         if(${_type} STREQUAL "DISABLED")
  10                 set(_feature_default "OFF")
  11                 message(STATUS "Skipping ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
  12         else()
  13                 if(${_type} STREQUAL "REQUIRED")
  14                         set(_feature_default "ON")
  15                         message(STATUS "Finding ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
  16                         find_package(${_feature} REQUIRED)
  17                 elseif(${_type} STREQUAL "RECOMMENDED")
  18                         if(NOT ${WITH_${_feature_upper}})
  19                                 set(_feature_default "OFF")
  20                                 message(STATUS "Skipping ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
  21                         else()
  22                                 set(_feature_default "ON")
  23                                 message(STATUS "Finding ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
  24                                 message(STATUS "    Disable feature ${_feature} using \"-DWITH_${_feature_upper}=OFF\"")
  25                                 find_package(${_feature})
  26                         endif()
  27                 elseif(${_type} STREQUAL "OPTIONAL")
  28                         if(${WITH_${_feature_upper}})
  29                                 set(_feature_default "ON")
  30                                 message(STATUS "Finding ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
  31                                 find_package(${_feature} REQUIRED)
  32                         else()
  33                                 set(_feature_default "OFF")
  34                                 message(STATUS "Skipping ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
  35                                 message(STATUS "    Enable feature ${_feature} using \"-DWITH_${_feature_upper}=ON\"")
  36                         endif()
  37                 else()
  38                         set(_feature_default "ON")
  39                         message(STATUS "Finding ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
  40                         find_package(${_feature})
  41                 endif()
  42
  43
  44                 if(NOT ${${_feature_upper}_FOUND})
  45                         if(${_feature_default})
  46                                 message(WARNING "    feature ${_feature} was requested but could not be found! ${_feature_default} / ${${_feature_upper}_FOUND}")
  47                         endif()
  48                         set(_feature_default "OFF")
  49                 endif()
  50
  51                 option(WITH_${_feature_upper} "Enable feature ${_feature} for ${_purpose}" ${_feature_default})
  52
  53                 set_package_properties(${_feature} PROPERTIES
  54                         TYPE ${_type}
  55                         PURPOSE "${_purpose}"
  56                         DESCRIPTION "${_description}")
  57         endif()
  58 endmacro(find_feature)
  59