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# types: DISABLED < RUNTIME < OPTIONAL < RECOMMENDED < REQUIRED
macro(find_feature _feature _type _purpose _description)
string(TOUPPER ${_feature} _feature_upper)
string(TOLOWER ${_type} _type_lower)
if(${_type} STREQUAL "DISABLED")
set(_feature_default "OFF")
message(STATUS "Skipping ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
else()
if(${_type} STREQUAL "REQUIRED")
set(_feature_default "ON")
message(STATUS "Finding ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
find_package(${_feature} REQUIRED)
elseif(${_type} STREQUAL "RECOMMENDED")
if(NOT ${WITH_${_feature_upper}})
set(_feature_default "OFF")
message(STATUS "Skipping ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
else()
set(_feature_default "ON")
message(STATUS "Finding ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
message(STATUS " Disable feature ${_feature} using \"-DWITH_${_feature_upper}=OFF\"")
find_package(${_feature})
endif()
elseif(${_type} STREQUAL "OPTIONAL")
if(${WITH_${_feature_upper}})
set(_feature_default "ON")
message(STATUS "Finding ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
find_package(${_feature} REQUIRED)
else()
set(_feature_default "OFF")
message(STATUS "Skipping ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
message(STATUS " Enable feature ${_feature} using \"-DWITH_${_feature_upper}=ON\"")
endif()
else()
set(_feature_default "ON")
message(STATUS "Finding ${_type_lower} feature ${_feature} for ${_purpose} (${_description})")
find_package(${_feature})
endif()
if(NOT ${${_feature_upper}_FOUND})
if(${_feature_default})
message(WARNING " feature ${_feature} was requested but could not be found! ${_feature_default} / ${${_feature_upper}_FOUND}")
endif()
set(_feature_default "OFF")
endif()
option(WITH_${_feature_upper} "Enable feature ${_feature} for ${_purpose}" ${_feature_default})
set_package_properties(${_feature} PROPERTIES
TYPE ${_type}
PURPOSE "${_purpose}"
DESCRIPTION "${_description}")
endif()
endmacro(find_feature)
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