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Every policy's documentation has a paragraph on what version of CMake introduced it, how to set the policy, and whether CMake warns if the policy is not set. The wording of this paragraph has diverged across policies over time. Factor the paragraph out into a standard advice document included by every policy.
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CMP0097
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-------
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.. versionadded:: 3.16
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:command:`ExternalProject_Add` with ``GIT_SUBMODULES ""`` initializes no
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submodules. The policy also applies to :command:`FetchContent_Declare`,
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which uses the same download and update features as
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:command:`ExternalProject_Add`.
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The commands provide a ``GIT_SUBMODULES`` option which controls what submodules
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to initialize and update. Starting with CMake 3.16, explicitly setting
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``GIT_SUBMODULES`` to an empty string means no submodules will be initialized
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or updated.
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This policy provides compatibility for projects that have not been updated
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to expect the new behavior.
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The ``OLD`` behavior for this policy is for ``GIT_SUBMODULES`` when set to
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an empty string to initialize and update all git submodules.
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The ``NEW`` behavior for this policy is for ``GIT_SUBMODULES`` when set to
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an empty string to initialize and update no git submodules.
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.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.16
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.. |WARNS_OR_DOES_NOT_WARN| replace:: does *not* warn
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.. include:: STANDARD_ADVICE.txt
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.. include:: DEPRECATED.txt
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