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43 lines
2.2 KiB
ReStructuredText
43 lines
2.2 KiB
ReStructuredText
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CMP0125
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-------
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.. versionadded:: 3.21
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The :command:`find_file`, :command:`find_path`, :command:`find_library` and
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:command:`find_program` commands cache their result in the variable specified
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by their first argument. Prior to CMake 3.21, if a cache variable of that
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name already existed before the call but the cache variable had no type, any
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non-cache variable of the same name would be discarded and the cache variable
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was always used (see also :policy:`CMP0126` for a different but similar
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behavior). This contradicts the convention that a non-cache variable should
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take precedence over a cache variable of the same name. Such a situation can
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arise if a user sets a cache variable on the command line without specifying
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a type, such as ``cmake -DMYVAR=blah ...`` instead of
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``cmake -DMYVAR:FILEPATH=blah``.
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Related to the above, if a cache variable of the specified name already exists
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and it *does* have a type, the various ``find_...()`` commands would return
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that value unchanged. In particular, if it contained a relative path, it
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would not be converted to an absolute path in this situation.
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When policy ``CMP0125`` is set to ``OLD`` or is unset, the behavior is as
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described above. When it is set to ``NEW``, the behavior is as follows:
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* If a non-cache variable of the specified name exists when the ``find_...()``
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command is called, its value will be used regardless of whether a cache
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variable of the same name already exists or not. A cache variable will not
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be created in this case if no such cache variable existed before.
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If a cache variable of the specified name did already exist, the cache will
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be updated to match the non-cache variable.
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* The various ``find...()`` commands will always provide an absolute path in
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the result variable, except where a relative path provided by a cache or
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non-cache variable cannot be resolved to an existing path.
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This policy was introduced in CMake version 3.21. Use the
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:command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly.
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Unlike many policies, CMake version |release| does *not* warn when the policy
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is not set and simply uses ``OLD`` behavior.
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.. include:: DEPRECATED.txt
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