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Build RTK from source via multi-stage build (rust:alpine) to produce a native musl binary — the pre-built arm64 release is gnu-linked and incompatible with Alpine's musl libc. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Replace QEMU-emulated arm64 Rust compilation (~23+ min) with native amd64 cross-compilation (~3-4 min) using aarch64-linux-gnu-gcc linker. Switch builder from rust:alpine to rust:slim-bookworm for cross-compilation toolchain availability. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The --platform=linux/amd64 on FROM is used deliberately to cross-compile RTK natively instead of under QEMU emulation. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Install libc6-dev-arm64-cross and set --sysroot so the aarch64 cross-compiler finds the correct C headers (fixes bits/libc-header-start.h not found). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The glibc cross-compiler (aarch64-linux-gnu-gcc) produces references to glibc-specific symbols (open64, stat64, etc.) that don't exist in musl. Switch to a proper musl cross-compiler from musl.cc that produces musl-compatible binaries for Alpine. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Replace musl.cc download (connection timeout in GitHub Actions) with zig, which natively targets musl and downloads from a reliable CDN (ziglang.org). A wrapper script invokes `zig cc -target aarch64-linux-musl` as the CC. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Replace broken zig/musl.cc/gcc cross-compilation attempts with a proven
two-stage approach:
- amd64: native musl build on rust:alpine
- arm64: cross-compile using messense/rust-musl-cross:aarch64-musl
(pre-built musl toolchain, runs natively on amd64, no QEMU)
- Dynamic FROM rtk-${TARGETARCH} selects the correct builder per platform
Both builds verified locally producing correct binaries.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Closing — superseded by #45 which rebuilt ralphex-fe from Alpine to Debian. The pre-built RTK binary works on Debian without the musl source build workaround this PR introduced. |
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Build RTK from source via multi-stage build (rust:alpine) to produce a native musl binary — the pre-built arm64 release is gnu-linked and incompatible with Alpine's musl libc.