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souveraine/scripts/build-cross.sh
2026-08-07 14:48:07 -04:00

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#!/usr/bin/env bash
# build-cross.sh — cross-compile souveraine for aarch64 (Pixel 3 / Arch ARM).
#
# The sysroot is /usr/aarch64-linux-gnu on the laptop and
# ~/aarch64-sysroot on ArchDev. Set SOUVERAINE_AARCH64_SYSROOT for the latter.
# PKG_CONFIG_* is exported here, not in .cargo/config.toml — cargo's [env]
# block doesn't reliably reach build-script probes. The aarch64 linker scripts
# need a small unprivileged overlay so absolute /usr/lib paths stay inside the
# target sysroot rather than resolving to the x86 host.
set -euo pipefail
cd "$(dirname "$0")/.."
SYSROOT="${SOUVERAINE_AARCH64_SYSROOT:-/usr/aarch64-linux-gnu}"
TARGET_DIR="${CARGO_TARGET_DIR:-$PWD/target}"
LINKER_SCRIPTS="$TARGET_DIR/aarch64-linker-scripts"
[[ -d "$SYSROOT/usr/lib" ]] || {
echo "aarch64 sysroot is missing: $SYSROOT" >&2
exit 1
}
mkdir -p "$LINKER_SCRIPTS"
while IFS= read -r script; do
name="${script##*/}"
tmp="$LINKER_SCRIPTS/.${name}.$$"
# '=' tells GNU ld to resolve this path below --sysroot. Only linker
# scripts (plain-text *.so files) are copied; actual shared objects stay
# in the sysroot.
sed -E 's#([ (])/(usr/)?lib/#\1=/\2lib/#g' "$script" > "$tmp"
mv "$tmp" "$LINKER_SCRIPTS/$name"
done < <(find "$SYSROOT/usr/lib" -maxdepth 1 -type f -name '*.so' \
-exec grep -lE '(^|[ (])/(usr/)?lib/' {} +)
export PKG_CONFIG_ALLOW_CROSS=1
export PKG_CONFIG_LIBDIR="$SYSROOT/usr/lib/pkgconfig"
export PKG_CONFIG_SYSROOT_DIR="$SYSROOT"
export PKG_CONFIG="$PWD/.cargo/aarch64-pkg-config"
export SOUVERAINE_AARCH64_SYSROOT="$SYSROOT"
export SOUVERAINE_AARCH64_LINKER_SCRIPTS="$LINKER_SCRIPTS"
export CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER="$PWD/scripts/aarch64-linker"
BIN_NAME=souveraine
EXPECT_BIN_NAME=false
for arg in "$@"; do
if $EXPECT_BIN_NAME; then
BIN_NAME="$arg"
EXPECT_BIN_NAME=false
continue
fi
case "$arg" in
--bin) EXPECT_BIN_NAME=true ;;
--bin=*) BIN_NAME="${arg#--bin=}" ;;
esac
done
cargo build --release --target aarch64-unknown-linux-gnu "$@"
BIN="$TARGET_DIR/aarch64-unknown-linux-gnu/release/$BIN_NAME"
[[ -x "$BIN" ]] || {
echo "requested build produced no executable: $BIN" >&2
exit 1
}
echo "== built: $BIN =="
file "$BIN"