c-capnproto/compiler/update-notes.md

occasionally, it may be required to sync with upstream capn proto changes. some quick notes on the process i've used here, assuming the updated capnproto repo is at CAPNP_CPP:

$ cp ${CAPNP_CPP}/c++/src/capnp/test.capnp .
$ cp ${CAPNP_CPP}/c++/src/capnp/schema.capnp .
$ cp ${CAPNP_CPP}/c++/src/capnp/c++.capnp .

fix up schema.capnp to reference the in-tree copy of c++.capnp (ie, using Cxx = import "c++.capnp"; at the top of the file)

then, regenerate the schema support:

$ capnp compile -o ./capnpc-c compiler/schema.capnp

now try to regenerate again, based on the previously regenerated schema.

you can always check the capnpc formatted output during debugging:

$ capnp compile -ocapnpc-capnpc compiler/schema.capnp