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CMAKE_NINJA_OUTPUT_PATH_PREFIX
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------------------------------
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.. versionadded:: 3.6
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Set output files path prefix for the :generator:`Ninja` generator.
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Every output files listed in the generated ``build.ninja`` will be
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prefixed by the contents of this variable (a trailing slash is
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appended if missing). This is useful when the generated ninja file is
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meant to be embedded as a ``subninja`` file into a *super* ninja
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project. For example, a ninja build file generated with a command
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like::
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cd top-build-dir/sub &&
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cmake -G Ninja -DCMAKE_NINJA_OUTPUT_PATH_PREFIX=sub/ path/to/source
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can be embedded in ``top-build-dir/build.ninja`` with a directive like
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this::
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subninja sub/build.ninja
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The ``auto-regeneration`` rule in ``top-build-dir/build.ninja`` must have an
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order-only dependency on ``sub/build.ninja``.
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.. note::
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When ``CMAKE_NINJA_OUTPUT_PATH_PREFIX`` is set, the project generated
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by CMake cannot be used as a standalone project. No default targets
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are specified.
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