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Brad King authored
Since commit v3.5.0-rc1~32^2~1 (ExternalProject: Simplify `cmake --build` configuration passing, 2016-01-19) we use the `$<CONFIG>` generator expression to generate the `cmake --build . --config <config>` value for the default BUILD_COMMAND instead of the CMAKE_CFG_INTDIR placeholder value provided by multi-config generators. However, some projects have been abusing the old implementation detail by setting CMAKE_CFG_INTDIR themselves to get a specific configuration. Those projects should be updated to set their own BUILD_COMMAND to get non-default behavior. Meanwhile we can be compatible with their existing releases by detecting when CMAKE_CFG_INTDIR is not a generator-provided placeholder and using its value instead.
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