- RULE_LAUNCH_CUSTOM
- ------------------
- Specify a launcher for custom rules.
- :ref:`Makefile Generators` and the :generator:`Ninja` generator prefix
- custom commands with the given launcher command line.
- This is intended to allow launchers to intercept build problems
- with high granularity. Other generators ignore this property
- because their underlying build systems provide no hook to wrap
- individual commands with a launcher.
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