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30 lines
1.3 KiB
30 lines
1.3 KiB
CMP0135
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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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command, CMake 3.23 and below sets the timestamps of the extracted contents
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to the same as the timestamps in the archive. When the ``URL`` changes, the
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new archive is downloaded and extracted, but the timestamps of the extracted
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contents might not be newer than the previous contents. Anything that depends
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on the extracted contents might not be rebuilt, even though the contents may
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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
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:command:`ExternalProject_Add` command can be used to explicitly specify how
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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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