Having trouble with Github CI

[Jens Alfke]

I’m trying to get my (C++) project to build in Github Actions, but getting compile errors because apparently there’s a version mismatch between the Cap’n Proto headers and tool.

I don’t build Cap’n Proto as part of the project; instead I use a package manager to install it. My CMakeLists.txt has a step to compile my interface:
find_package(CapnProto CONFIG REQUIRED)
capnp_generate_cpp(myCapnPSources myCapnPHeaders src/interface.capnp)

This works fine in local builds, both macOS and Ubuntu.

In my Github Actions yaml file, I added a build step that uses the get-package action:
- name: Install Capn Proto
uses: mstksg/get-package@v1
with:
brew: capnp
apt-get: capnproto libcapnp-dev

Unfortunately the C++ compile then fails with the error: "Version mismatch between generated code and library headers. You must use the same version of the Cap'n Proto compiler and library.”

I assume this means that on the Github runner the `capnp` tool is from a different version than the headers. I don’t know why that would be, when I had apt install both packages. (And why would there be a second installation of Cap’n Proto at all?)

Has anyone successfully gotten Github Actions to build C++ based Cap’n Proto projects?

—Jens

[Kenton Varda]

Hi Jens,

Do you get that same error in both Ubuntu and MacOS actions? It would seem pretty surprising if both platforms were getting version-skewed installations.

Does your source code include any checked-in generated code (.capnp.h files)? If so then the problem is presumably that the code was generated with the capnp on your machine, which is a different version from what the action machines use.

-Kenton

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