Cross.toml

# cross-rs configuration.
#
# cross does not pass arbitrary host env into the build container by default, so
# anything the build needs from the workflow env must be whitelisted here.
# cross reads the Cross.toml in the BUILD CWD (the nub repo root), NOT
# vendor/aube/Cross.toml — so the primer/RUSTFLAGS passthroughs the aube fork
# declares for its OWN cross builds are invisible to nub's `cross build`. They
# must be duplicated here.
#
# - RUSTFLAGS: the release workflow builds the nub-native cdylib (.node) addon
#   for the musl targets with `RUSTFLAGS="-C target-feature=-crt-static"` (musl's
#   default fully-static crt can't produce a cdylib). Without this passthrough the
#   flag is silently dropped and the musl addon build fails with "cannot produce
#   cdylib ... musl does not support these crate types".
#
# - AUBE_PRIMER_TOP / AUBE_PRIMER_VERSION_CAP / AUBE_REQUIRE_PRIMER: vendor/aube's
#   build.rs embeds the metadata primer. The primer file is downloaded into
#   vendor/aube/crates/aube-resolver/data BEFORE the cross build (see the build
#   job's "Download metadata primer" step). These env vars tell build.rs which
#   primer-top{TOP}-v{CAP}-s<schema> file to embed, and AUBE_REQUIRE_PRIMER=1 makes
#   it FAIL LOUD on an empty/missing primer. WITHOUT this passthrough they are
#   dropped inside the cross container and the require guard never fires for the
#   musl/arm cross targets — the exact platforms that silently shipped an empty
#   primer in 0.0.37. The whole cross-build primer fix hinges on this line.
#   See .github/workflows/release.yml.
[build.env]
passthrough = [
    "RUSTFLAGS",
    "AUBE_PRIMER_TOP",
    "AUBE_PRIMER_VERSION_CAP",
    "AUBE_REQUIRE_PRIMER",
]