wrmath/docs/CMakeLists.txt

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CMake
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find_package(Doxygen REQUIRED)
# Find all the public headers
get_target_property(WRMATH_PUBLIC_HEADER_DIR libwrmath INTERFACE_INCLUDE_DIRECTORIES)
file(GLOB_RECURSE WRMATH_PUBLIC_HEADERS ${WRMATH_PUBLIC_HEADER_DIR}/*.h)
#This will be the main output of our command
set(DOXYGEN_INDEX_FILE ${CMAKE_CURRENT_SOURCE_DIR}/html/index.html)
add_custom_command(OUTPUT ${DOXYGEN_INDEX_FILE}
DEPENDS ${WRMATH_PUBLIC_HEADERS}
COMMAND ${DOXYGEN_EXECUTABLE} Doxyfile
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
MAIN_DEPENDENCY Doxyfile
COMMENT "Generating docs")
add_custom_target(Doxygen ALL DEPENDS ${DOXYGEN_INDEX_FILE})