Execute a CMake function on every build-time - cmake

Question

I have two cmake function to check resources/shader files are not found/ modified matching to build.
Check.cmake
function(Check sourcefile destinationfile)
if(NOT EXISTS ${destinationfile})
execute_process(COMMAND ${CMAKE_COMMAND}
-E copy ${sourcefile} ${destinationfile})
elseif(${sourcefile} IS_NEWER_THAN ${destinationfile})
execute_process(COMMAND ${MSGMERGE_EXECUTABLE}
"--update" ${destinationfile} ${sourcefile}
OUTPUT_QUIET ERROR_VARIABLE error RESULT_VARIABLE ret)
if(ret) # Have to do this hack as msgmerge prints to stderr.
message(SEND_ERROR "${error}")
endif()
endif()
endfunction()
AddResources.cmake
include(./Check.cmake)
function(AddResources project)
file(GLOB_RECURSE resources ${PROJECT_SOURCE_DIR}/src/project1/Resources/*)
file(GLOB_RECURSE shaders ${PROJECT_SOURCE_DIR}/src/project1/Shaders/*)
foreach( each_file1 ${resources} )
get_filename_component(targetFile ${each_file1} NAME)
if(WIN32)
set(destinationfile "${CMAKE_CURRENT_SOURCE_DIR}/bin/Release/${targetFile}")
set(destinationfile2 "${CMAKE_CURRENT_SOURCE_DIR}/bin/Debug/${targetFile}")
set(sourcefile ${each_file1})
Check(${sourcefile} ${destinationfile})
Check(${sourcefile} ${destinationfile2})
else ()
set(destinationfile "${CMAKE_CURRENT_SOURCE_DIR}/bin/${targetFile}")
set(sourcefile ${each_file1})
Check(${sourcefile} ${destinationfile})
endif()
endforeach(each_file1)
foreach( each_file2 ${shaders} )
get_filename_component(targetFile ${each_file2} NAME)
if(WIN32)
set(destinationfile "${CMAKE_CURRENT_SOURCE_DIR}/bin/Release/${targetFile}")
set(destinationfile2 "${CMAKE_CURRENT_SOURCE_DIR}/bin/Debug/${targetFile}")
set(sourcefile ${each_file2})
Check(${sourcefile} ${destinationfile})
Check(${sourcefile} ${destinationfile2})
else()
set(destinationfile "${CMAKE_CURRENT_SOURCE_DIR}/bin/${targetFile}")
set(sourcefile ${each_file2})
Check(${sourcefile} ${destinationfile})
endif()
endforeach(each_file2)
endfunction()
It is executed AddResources(project1) in the CMakeLists.txt.
AddResources will copy all of resources and shaders to bin folder, but it copies only once(CMake configuration process), not every build-time.
Is there any way to execute CMake function every build-time with argument?

Answer 1

I think you're looking for add_custom_command
add_custom_command(TARGET target
PRE_BUILD | PRE_LINK | POST_BUILD
COMMAND command1 [ARGS] [args1...]
[COMMAND command2 [ARGS] [args2...] ...]
[WORKING_DIRECTORY dir]
[COMMENT comment] [VERBATIM])
This defines a new command that will be associated with building the specified target. When the command will happen is determined by which of the following is specified:
PRE_BUILD - run before all other dependencies
PRE_LINK - run after other dependencies
POST_BUILD - run after the target has been built