Error when cross compiling using `cross build` about prost HOT 7 OPEN

Hi @Danvil ,
Can you share your Cross.toml?

I am able to using Cross and Prost and cross compile to various architectures. Here's a link to Cross.toml from one of my repo.

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Thank you that reference helped!

I added "apt install -y protobuf-compiler", to my Cross.toml, but now I get this error:

Error: Custom { kind: Other, error: "protoc failed: foo.proto:5:10: Unrecognized syntax identifier \"proto3\". This parser only recognizes \"proto2\".\n" }

Full Cross.toml:

[target.aarch64-unknown-linux-gnu]
pre-build = [
    "dpkg --add-architecture $CROSS_DEB_ARCH",
    "apt-get update && apt-get install -y pkg-config libudev-dev:$CROSS_DEB_ARCH",
    "apt install -y protobuf-compiler",
]

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"main" seems to provide a newer version of protobuf, but unfortunately it is still too old. My protos use optional and need at least v3.15 (version from early 2021). I guess this issue is not directly related to prost though. I will play around with the cross setup to maybe manually download a newer version.

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@Danvil Has this been resolved? Can you share the solution and close this issue?

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@caspermeijn I resolved the issue but unfortunately I don't quite remember exactly how.

I did add this line to my Cross.toml:

image = "ghcr.io/cross-rs/aarch64-unknown-linux-gnu:main"

Manually specifying an image might have pulled a newer version of the protobuf compiler.

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@Danvil Could you close the issue, now that it is resolved?

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