Makefile: Add policy CMP0113 to avoid duplication of custom commands

Do not attach a custom command to a target if it is already attached to one of
the target's dependencies.  The command's output will be available by the time
the target needs it because the dependency containing the command will have
already been built.

This may break existing projects that do not properly mark non-created
outputs with the `SYMBOLIC` property.  Previously a chain of two custom
commands whose intermediate dependency is not created would put both
commands in a dependent project's Makefile even if the first command is
also in its dependency's Makefile.  The first command would run twice
but the build would work.  Now the second command needs an explicit
`SYMBOLIC` mark on its input to tell CMake that it is not expected to
exist.  To maintain compatibility with projects that left out the mark,
add a policy activating the behavior.

1 files changed, 5 insertions, 0 deletions

diff --git a/Help/release/dev/custom-command-dedup.rst b/Help/release/dev/custom-command-dedup.rst
new file mode 100644
index 0000000..65fa303
--- /dev/null
+++ b/Help/release/dev/custom-command-dedup.rst
@@ -0,0 +1,5 @@
+custom-command-dedup
+--------------------
+
+* :ref:`Makefile Generators` no longer repeat custom commands from target
+  dependencies.  See policy :policy:`CMP0113`.