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build: add RUSTUP_HOME to cross build volumes #1861

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build: add RUSTUP_HOME to cross build volumes #1861

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8 changes: 8 additions & 0 deletions Cross.toml
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# Also bind-mount the host RUSTUP_HOME at its original path inside the
# container. cross mounts the active toolchain at /rust, but the nixpkgs
# rustup linker-wrapper has the toolchain's original absolute path baked in
# (it calls .../bin/gcc-ld-unwrapped/ld.lld via -fuse-ld=lld). Without this
# mount that path doesn't exist inside the container, so linking host-side
# build scripts (e.g. windows_x86_64_gnu) fails with ENOENT / "ld returned 127".
[build.env]
volumes = ["RUSTUP_HOME"]
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