find_program(DOT_EXE "dot")

mark_as_advanced(FORCE DOT_EXE)

if(DOT_EXE)

message(STATUS "dot found: ${DOT_EXE}")

else()

message(STATUS "dot not found!")

endif()

if(NOT DOT_EXE)

option(

BUILD_DEP_GRAPH

"Builds a visual representation of the dependencies of that included targets"

OFF)

else()

option(

BUILD_DEP_GRAPH

"Builds a visual representation of the dependencies of that included targets"

ON)

endif()

function(gen_dep_graph OUTPUT_TYPE)

set(OPTIONS ADD_TO_DEP_GRAPH)

set(SINGLE_VALUE_KEYWORDS TARGET_NAME OUTPUT_DIR)

set(MULTI_VALUE_KEYWORDS)

cmake_parse_arguments(gen_dep_graph "${OPTIONS}" "${SINGLE_VALUE_KEYWORDS}"

"${MULTI_VALUE_KEYWORDS}" ${ARGN})

if(BUILD_DEP_GRAPH)

if(NOT DOT_EXE)

message(FATAL_ERROR "`dot` is needed to build the dependency graph.")

endif()

if(gen_dep_graph_TARGET_NAME)

set(TARGET_NAME ${gen_dep_graph_TARGET_NAME})

else()

set(TARGET_NAME dep-graph-${PROJECT_NAME})

endif()

if(gen_dep_graph_OUTPUT_DIR)

set(OUT_DIR ${gen_dep_graph_OUTPUT_DIR})

else()

set(OUT_DIR ${CMAKE_CURRENT_BINARY_DIR})

endif()

add_custom_target(

${TARGET_NAME}

COMMAND ${CMAKE_COMMAND} ${CMAKE_SOURCE_DIR}

--graphviz=${CMAKE_CURRENT_BINARY_DIR}/graphviz/${TARGET_NAME}.dot

COMMAND

${DOT_EXE} -T${OUTPUT_TYPE}

${CMAKE_CURRENT_BINARY_DIR}/graphviz/${TARGET_NAME}.dot -o

${OUT_DIR}/${TARGET_NAME}.${OUTPUT_TYPE}

COMMAND

${CMAKE_COMMAND} -E echo

"Dependency graph for ${TARGET_NAME} generated and located at ${OUT_DIR}/${TARGET_NAME}.${OUTPUT_TYPE}"

)

if(gen_dep_graph_ADD_TO_DEP_GRAPH)

if(NOT TARGET dep-graph)

add_custom_target(dep-graph)

endif()

add_dependencies(dep-graph ${TARGET_NAME})

endif()

endif()

endfunction()