Help: Document CLEAN_NO_CUSTOM as for Makefile generators only (#15856)

The property cannot be implemented on other generators because the
corresponding native build tools (VS IDE, Xcode, Ninja) all implement
their own `clean` operations that affect all outputs.  Document this
limitation.
This commit is contained in:
Brad King 2015-11-23 13:41:16 -05:00
parent dbef2244f9
commit 15c454fe82
1 changed files with 3 additions and 4 deletions

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CLEAN_NO_CUSTOM
---------------
Should the output of custom commands be left.
If this is true then the outputs of custom commands for this directory
will not be removed during the "make clean" stage.
Set to true to tell :ref:`Makefile Generators` not to remove the outputs of
custom commands for this directory during the ``make clean`` operation.
This is ignored on other generators because it is not possible to implement.