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export: Disable PACKAGE mode user package registry by default

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The user package registry populated by the `export()` command causes
side effects outside the build and source directories.  Such effects
should be opt-in rather than op-out.  Introduce a policy to change
default behavior of `export(PACKAGE)` to do nothing.
This commit is contained in:
Robert Maynard
2018-11-13 08:39:27 -06:00
committed by Brad King
parent 0df31d99ae
commit 9bede5c4ce
11 changed files with 117 additions and 14 deletions
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Help/command/export.rst
+7 -2
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@@ -62,8 +62,13 @@ registry that this command creates works only in conjunction with a
package configuration file (``<PackageName>Config.cmake``) that works with the
build tree. In some cases, for example for packaging and for system
wide installations, it is not desirable to write the user package
registry. If the :variable:`CMAKE_EXPORT_NO_PACKAGE_REGISTRY` variable
is enabled, the ``export(PACKAGE)`` command will do nothing.
registry.
By default the ``export(PACKAGE)`` command does nothing (see policy
:policy:`CMP0090`) because populating the user package registry has effects
outside the source and build trees. Set the
:variable:`CMAKE_EXPORT_PACKAGE_REGISTRY` variable to add build directories to
the CMake user package registry.
.. code-block:: cmake