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utility_source
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--------------
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Disallowed. See CMake Policy :policy:`CMP0034`.
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Specify the source tree of a third-party utility.
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::
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utility_source(cache_entry executable_name
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path_to_source [file1 file2 ...])
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When a third-party utility's source is included in the distribution,
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this command specifies its location and name. The cache entry will
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not be set unless the ``path_to_source`` and all listed files exist. It
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is assumed that the source tree of the utility will have been built
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before it is needed.
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When cross compiling CMake will print a warning if a ``utility_source()``
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command is executed, because in many cases it is used to build an
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executable which is executed later on. This doesn't work when cross
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compiling, since the executable can run only on their target platform.
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So in this case the cache entry has to be adjusted manually so it
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points to an executable which is runnable on the build host.
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