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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
#
# rustc wrapper for package builds. It passes options of unstable rustc to the
# target crates cargo compiles, and allows them for that crate alone: build
# scripts probe for unstable features, under the crate's own name, and change
# their code when they find them. A target crate of cargo carries --target,
# -C metadata and --error-format=json; probes and build scripts do not, and
# pass through unchanged.
#
# RUST_TARGET_WRAPPER_FLAGS options for every target crate
# RUST_TARGET_WRAPPER_LTO_FLAGS further options when the crate runs LTO
# RUST_TARGET_WRAPPER_NEXT wrapper to run rustc with, such as sccache
rustc="$1"
shift
target=
metadata=
json=
lto=
crate=
prev=
for arg in "$@"; do
case "$prev:$arg" in
--target:*|*:--target=*) target=1 ;;
-C:metadata=*|*:-Cmetadata=*) metadata=1 ;;
*:--error-format=json) json=1 ;;
--crate-name:*) crate="$arg" ;;
-C:lto=off|-C:lto=no|-C:lto=false|*:-Clto=off|*:-Clto=no|*:-Clto=false) ;;
-C:lto|-C:lto=*|*:-Clto|*:-Clto=*) lto=1 ;;
esac
prev="$arg"
done
if [ -z "$target" ] || [ -z "$metadata" ] || [ -z "$json" ] || [ -z "$crate" ]; then
exec $RUST_TARGET_WRAPPER_NEXT "$rustc" "$@"
fi
exec env RUSTC_BOOTSTRAP="$crate" $RUST_TARGET_WRAPPER_NEXT "$rustc" "$@" \
$RUST_TARGET_WRAPPER_FLAGS ${lto:+$RUST_TARGET_WRAPPER_LTO_FLAGS}
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