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fix: install cross toolchain for the other arch in the linux image - #45
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On arm64, clang --target=x86_64-linux-gnu could not link because the image only shipped native libc, crt files and ld. Linker probes then fell back to plain ld, which failed to find the target libraries. Install the cross gcc (which brings <triple>-ld and the cross libgcc) plus the cross libc for the other supported arch: x86_64 on arm64 and aarch64 on amd64. libc6-dev-*-cross is only a Recommends of the cross gcc, so it is listed explicitly. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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On arm64, clang --target=x86_64-linux-gnu could not link because the image only shipped native libc, crt files and ld. Linker probes then fell back to plain ld, which failed to find the target libraries.
Install the cross gcc (which brings -ld and the cross libgcc) plus the cross libc for the other supported arch: x86_64 on arm64 and aarch64 on amd64. libc6-dev-*-cross is only a Recommends of the cross gcc, so it is listed explicitly.