I have python script that is run through add_custom_command in my project, this script analyzes target sources and generate additional one for the target.
get_target_property(TARGET_SOURCES ${target} SOURCES)
add_custom_command(
OUTPUT ${CMAKE_BINARY_DIR}/static_init/generated/${target}/static_init.cpp
COMMAND ${Python3_EXECUTABLE} myscript.py
DEPENDS ${TARGET_SOURCES}
VERBATIM)
target_sources( "${target}" PRIVATE "${CMAKE_BINARY_DIR}/static_init/generated/${target}/static_init.cpp" )
I need my script to rerun when one of sources becomes “dirty” (e.g. one of included headers is changed, probably this file is in another target and it is not guaranteed that another target will be rebuild on header change). As we use Ninja, IMPLICIT_DEPENDS isn’t available for us, so it looks DEPFILE property is the way to do it, but I cannot understand, how can I get one for all ${TARGET_SOURCES}?
It doesn’t seem to me that ninja will generate something like that automatically, I cannot write it by hands, as it will require to recursively analyze all includes during cmake run. Or maybe there is another way to solve this problem?