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# A macro that checks whether optional sources exist and if they do, they
# are added to the build/install process, else a warning is issued
#
# _dir: the subdir of the current source dir in which the optional
# sources are located
# _packageName: a string that identifies the package
# _varName: name of the variable indicating whether package is scheduled
# to be installed
macro(CheckOptionalBuildSources _dir _packageName _varName)
if (${_varName})
if (EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${_dir}/CMakeLists.txt)
add_subdirectory(${_dir})
else ()
message(WARNING "${_packageName} source code does not exist in "
"${CMAKE_CURRENT_SOURCE_DIR}/${_dir} "
"so it will not be built or installed")
set(${_varName} false)
endif ()
endif ()
endmacro(CheckOptionalBuildSources)
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