[cmake-developers] cmake-server protocol versioning

[Justin Goshi]

I work at Microsoft on the version of CMake shipping with Visual Studio, and we use the cmake-server to talk to CMake.

At some point between cmake version 3.9.0 and 3.9.1 the cmake-server protocol changed. Looking through the source code, I see that cmServerProtocol1::ProtocolVersion now returns 1,1 when it used to return 1,0. Has there been discussion about backwards compatibility? In particular we were thinking something along these lines would be nice.

  *   Every change to the information returned from CMake increments the protocol number
  *   CMake -server supports all protocol numbers by letting you specify which one you are requesting. Extra data that is ignored is okay with older protocols, but it can't change the expected data.
  *   CMake -server has tests to verify it supports older protocol numbers.

What are your thoughts?

Thank you.
Justin

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