22 lines
850 B
ReStructuredText
22 lines
850 B
ReStructuredText
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CMP0057
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Disallow multiple ``MAIN_DEPENDENCY`` specifications for the same file.
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CMake 3.3 and above no longer allow the same input file to be used
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as a ``MAIN_DEPENDENCY`` in more than one custom command.
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Listing the same input file more than once in this context has not been
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supported by earlier versions either and would lead to build time issues
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but was not diagnosed.
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The ``OLD`` behavior for this policy is to allow using the same input file
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in a ``MAIN_DEPENDENCY`` specfication more than once.
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The ``NEW`` behavior is to disallow using the same input file in a
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``MAIN_DEPENDENCY`` specification more than once.
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This policy was introduced in CMake version 3.3.
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CMake version |release| warns when the policy is not set and uses
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``OLD`` behavior. Use the :command:`cmake_policy` command to set
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it to ``OLD`` or ``NEW`` explicitly.
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