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if (NOT _OptionalPackagesFile)
set(_OptionalPackagesFile
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/OptionalPackages.txt)
if (EXISTS ${_OptionalPackagesFile})
file(REMOVE ${_OptionalPackagesFile})
endif()
endif()
file(APPEND "${_OptionalPackagesFile}" "")
macro (find_optional_package _package)
string(TOUPPER ${_package} _packageUpper)
if (NOT DEFINED WITH_${_packageUpper})
# First run and WITH_${_packageUpper} option is not set by the user.
# Enable auto-mode and try to find package.
find_package(${_package} ${ARGN})
elseif (WITH_${_packageUpper})
# Non-first run or WITH_${_packageUpper} was set by the user.
# Force error if the package will not be found.
set(${_packageUpper}_FIND_REQUIRED ON)
find_package(${_package} ${ARGN})
endif ()
if (${_package}_FOUND OR ${_packageUpper}_FOUND)
set(_default ON)
else()
set(_default OFF)
endif()
# Add the user option and (!) update the cache
option(WITH_${_packageUpper} "Search for ${_package} package" ${_default})
# Now ${WITH_${_packageUpper}} is either ON or OFF
file(APPEND "${_OptionalPackagesFile}"
"-- WITH_${_packageUpper}=${WITH_${_packageUpper}}\n")
endmacro (find_optional_package)
macro(list_optional_packages)
file(READ ${_OptionalPackagesFile} _message)
find_package_message(OPTIONAL_PACKAGES "${_message}" "${_message}")
endmacro()
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