Build macro plugin as host-bound subproject#11
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To enforce host target even when cross-compiling.
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To enforce host target even when cross-compiling, because the macro plugin must run on the host machine regardless of the target it's bound to. ExternalProject is a quick way to avoid target inheritance when cross-compiling.
E.g. when cross-compiling for Android on a macOS machine, the SWON macro plugin must be built for macOS, but the SWON implementation (based on cJSON) must be built for Android.