CMake/Tests/RunCMake/BuildDepends/Custom-Symbolic-and-Byprodu...

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add_custom_command(
OUTPUT gen-byproduct gen-byproduct-stamp
BYPRODUCTS byproduct
COMMAND ${CMAKE_COMMAND} -E touch gen-byproduct-stamp
COMMAND ${CMAKE_COMMAND} -E copy_if_different gen-byproduct-stamp byproduct
)
set_property(SOURCE gen-byproduct PROPERTY SYMBOLIC 1)
add_custom_target(produce DEPENDS gen-byproduct)
add_custom_command(
OUTPUT use-byproduct
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/byproduct
COMMAND ${CMAKE_COMMAND} -E sleep 1.125 # workaround buggy filesystem timestamps
COMMAND ${CMAKE_COMMAND} -E touch use-byproduct
)
add_custom_target(drive ALL DEPENDS use-byproduct)
add_dependencies(drive produce)
file(GENERATE OUTPUT check-$<LOWER_CASE:$<CONFIG>>.cmake CONTENT "
if (check_step EQUAL 1)
set(check_pairs
\"${CMAKE_CURRENT_BINARY_DIR}/use-byproduct|${CMAKE_CURRENT_BINARY_DIR}/gen-byproduct-stamp\"
)
else()
set(check_pairs
\"${CMAKE_CURRENT_BINARY_DIR}/gen-byproduct-stamp|${CMAKE_CURRENT_BINARY_DIR}/use-byproduct\"
)
endif()
")