Brad King 6b3cd64d42 ExternalProject: Propagate the generator instance ...

When the `CMAKE_GENERATOR` option is given to `ExternalProject_Add`,
look also for option `CMAKE_GENERATOR_INSTANCE` to pass on to cmake as a
cache definition.  When no `CMAKE_GENERATOR` option is given explicitly
then use the current project's `CMAKE_GENERATOR_INSTANCE` (since we
already use its CMAKE_GENERATOR).

2017-10-19 10:20:11 -04:00

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