32 lines
1.2 KiB
CMake
32 lines
1.2 KiB
CMake
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# Add a target that requires step1 to run first but enforces
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# it only by target-level ordering dependency.
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add_custom_command(
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OUTPUT step2.txt
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COMMAND ${CMAKE_COMMAND} -E copy step1.txt step2.txt
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)
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add_custom_target(step2 DEPENDS step2.txt)
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add_dependencies(step2 step1)
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# Add a target that requires step1 and step2 to work,
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# only depends on step1 transitively through step2, but
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# also gets a copy of step2's custom command.
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# The Ninja generator in particular must be careful with
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# this case because it needs to compute the proper set of
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# target ordering dependencies for the step2 custom command
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# even though it appears in both the step2 and step3
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# targets due to dependency propagation.
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add_custom_command(
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OUTPUT step3.txt
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COMMAND ${CMAKE_COMMAND} -E copy step1.txt step3-1.txt
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COMMAND ${CMAKE_COMMAND} -E copy step2.txt step3.txt
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DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/step2.txt
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)
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add_custom_target(step3 ALL DEPENDS step3.txt)
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add_dependencies(step3 step2)
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# We want this target to always run first. Add it last so
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# that serial builds require dependencies to order it first.
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add_custom_target(step1
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COMMAND ${CMAKE_COMMAND} -E touch step1.txt
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)
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