Export PREFERRED_PROTOBUF_EXECUTABLE globally #39
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When setting
USE_SYSTEM_PROTOBUF
to anything other thatAUTO
the variablePREFERRED_PROTOC_EXECUTABLE
stores the preferred protobuf version afaik. However, this variable is not exported beyond the current cmake project it was defined in. This PR fixed this behavior.We require this to force
protobuf_catkin
to use the protouf version supplied by grpc, instead of the system one, since the two are not guaranteed to be the same version.Tested on
5.13.0-30-generic #33~20.04.1-Ubuntu