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32 lines
1.4 KiB
32 lines
1.4 KiB
CMP0126
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-------
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.. versionadded:: 3.21
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When this policy is set to ``NEW``, the :command:`set(CACHE)` command does not
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remove any normal variable of the same name from the current scope.
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The ``OLD`` behavior removes any normal variable of the same name from the
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current scope in the following situations:
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* No cache variable of that name existed previously.
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* A cache variable of that name existed previously, but it had no type.
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This can occur when the variable was set on the command line using a form
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like ``cmake -DMYVAR=blah`` instead of ``cmake -DMYVAR:STRING=blah``.
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Note that the ``NEW`` behavior has an important difference to the similar
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``NEW`` behavior of policy :policy:`CMP0077`. The :command:`set(CACHE)`
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command always sets the cache variable if it did not exist previously,
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regardless of the ``CMP0126`` policy setting. The :command:`option` command
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will *not* set the cache variable if a non-cache variable of the same name
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already exists and :policy:`CMP0077` is set to ``NEW``.
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Policy ``CMP0126`` 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. See documentation of the
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:variable:`CMAKE_POLICY_WARNING_CMP0126 <CMAKE_POLICY_WARNING_CMP<NNNN>>`
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variable to control the warning.
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.. include:: DEPRECATED.txt
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