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44 lines
1.8 KiB
ReStructuredText
44 lines
1.8 KiB
ReStructuredText
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CMP0113
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-------
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.. versionadded:: 3.19
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:ref:`Makefile Generators` do not repeat custom commands from target
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dependencies.
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Consider a chain of custom commands split across two dependent targets:
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.. code-block:: cmake
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add_custom_command(OUTPUT output-not-created
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COMMAND ... DEPENDS ...)
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set_property(SOURCE output-not-created PROPERTY SYMBOLIC 1)
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add_custom_command(OUTPUT output-created
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COMMAND ... DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/output-not-created)
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add_custom_target(first DEPENDS output-not-created)
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add_custom_target(second DEPENDS output-created)
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add_dependencies(second first)
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In CMake 3.18 and lower, the Makefile generators put a copy of both custom
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commands in the Makefile for target ``second`` even though its dependency on
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target ``first`` ensures that the first custom command runs before the second.
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Running ``make second`` would cause the first custom command to run once in
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the ``first`` target and then again in the ``second`` target.
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CMake 3.19 and above prefer to not duplicate custom commands in a target that
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are already generated in other targets on which the target depends (directly or
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indirectly). This policy provides compatibility for projects that have not
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been updated to expect the new behavior. In particular, projects that relied
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on the duplicate execution or that did not properly set the :prop_sf:`SYMBOLIC`
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source file property may be affected.
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The ``OLD`` behavior for this policy is to duplicate custom commands in
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dependent targets. The ``NEW`` behavior of this policy is to not duplicate
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custom commands in dependent targets.
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This policy was introduced in CMake version 3.19. Unlike many policies,
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CMake version |release| does *not* warn when this policy is not set and
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simply uses ``OLD`` behavior.
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.. include:: DEPRECATED.txt
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