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CMP0135
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-------
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.. versionadded:: 3.24
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When using the ``URL`` download method with the :command:`ExternalProject_Add`
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or :command:`FetchContent_Declare` commands, CMake 3.23 and below sets the
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timestamps of the extracted contents to the same as the timestamps in the
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archive. When the ``URL`` changes, the new archive is downloaded and extracted,
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but the timestamps of the extracted contents might not be newer than the
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previous contents. Anything that depends on the extracted contents might not
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be rebuilt, even though the contents may change.
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CMake 3.24 and above prefers to set the timestamps of all extracted contents
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to the time of the extraction. This ensures that anything that depends on the
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extracted contents will be rebuilt whenever the ``URL`` changes.
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The ``DOWNLOAD_EXTRACT_TIMESTAMP`` option to the :command:`ExternalProject_Add`
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and :command:`FetchContent_Declare` commands can be used to explicitly specify
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how timestamps should be handled. When ``DOWNLOAD_EXTRACT_TIMESTAMP`` is not
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given, this policy controls the default behavior. The ``OLD`` behavior for
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this policy is to restore the timestamps from the archive. The ``NEW``
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behavior sets the timestamps of extracted contents to the time of extraction.
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.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.24
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.. |WARNS_OR_DOES_NOT_WARN| replace:: warns
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.. include:: STANDARD_ADVICE.txt
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.. include:: DEPRECATED.txt
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