xx-cargo issue with linux/arm/v6 target

[jlesage]

I have an issue where a build using xx-cargo with a linux/arm/v6 target is failing. Other platforms are working fine (linux/amd64, linux/386, linux/arm/v7, inux/arm64/v8).

After investigation, I found that some symbolic links are not created:

• /arm-unknown-linux-musleabi -> armv6-alpine-linux-musleabihf
• /armv6-alpine-linux-musleabihf/usr/lib/gcc/arm-unknown-linux-musleabi -> armv6-alpine-linux-musleabihf

With other platforms, these links are indeed properly done.

Manually creating the links fixed my build.

NOTE: The build is done under Alpine Linux.

NOTE: When using rust from the Alpine repository, the problem is not seen. Probably because their version define alpine-specific targets (https://git.alpinelinux.org/aports/tree/community/rust/alpine-target.patch?h=3.17-stable)?

[crazy-max]

Can you post a repro with your Dockerfile please?

[jlesage]

Sure, here is a minimal Dockerfile you can use:

FROM --platform=$BUILDPLATFORM tonistiigi/xx AS xx

FROM --platform=$BUILDPLATFORM alpine:3.17

ARG TARGETPLATFORM

COPY --from=xx / /

RUN \
    apk --no-cache add \
        bash \
        curl \
        clang \
        gcc \
        musl-dev \
        && \
    xx-apk --no-cache --no-scripts add \
        musl-dev \
        gcc \
        && \
    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | bash -s -- -y && \
    source /root/.cargo/env && \
    cd /tmp && cargo new hello_cargo && \
    echo 'zip = "0.6"' >> /tmp/hello_cargo/Cargo.toml && \
    cd /tmp/hello_cargo && \
    xx-cargo build

You should see that building for linux/arm/v6 fails, while other platforms work.

[jlesage]

Here is what I did to "fix" the problem: https://github.com/jlesage/docker-czkawka/blob/7221062af8ad2bec94876b23c1f64bd07ffcc23d/src/czkawka/build.sh#L52