#!/bin/sh
# Build one native Koh release into build/releases/koh-<target>.
# koh build supplies KOH_TARGET; otherwise use this host.
# The pinned V disables GC when cross-compiling, so each target needs
# its own OS and CPU. macOS binaries require ad-hoc signing.
set -eu

die() {
  echo "build.sh: $*" >&2
  exit 1
}

cd "$(dirname "$0")"

# The pin is the only compiler Koh is verified against; see AGENTS.md.
command -v v >/dev/null 2>&1 || die 'V is not on PATH; install V 0.5.2 b9a2d87 (see AGENTS.md)'
[ "$(v version)" = 'V 0.5.2 b9a2d87' ] || die "Koh requires V 0.5.2 b9a2d87, found: $(v version)"

host_target() {
  case "$(uname -s)" in
    Darwin) os=macos ;;
    Linux) os=linux ;;
    *) die "unsupported host OS: $(uname -s)" ;;
  esac
  case "$(uname -m)" in
    arm64|aarch64) cpu=aarch64 ;;
    x86_64|amd64) cpu=x86_64 ;;
    *) die "unsupported host CPU: $(uname -m)" ;;
  esac
  echo "$os-$cpu"
}

native=$(host_target)
target=${KOH_TARGET:-$native}
case "$target" in
  macos-aarch64|linux-aarch64|linux-x86_64) ;;
  *) die "unsupported release target: $target (want macos-aarch64, linux-x86_64 or linux-aarch64)" ;;
esac
[ "$target" = "$native" ] || die "$target requires a native $target host or VM to retain garbage collection (this host is $native)"
out="build/releases/koh-$target"
mkdir -p build/releases

case "$target" in
  macos-aarch64)
    v -prod -gc boehm -d use_bundled_libgc -arch arm64 \
      -cflags '-arch arm64 -mmacosx-version-min=11.0' -o "$out" src/koh.v
    # Apple Silicon refuses to run an unsigned binary.
    codesign -f -s - "$out"
    ;;
  linux-aarch64|linux-x86_64)
    command -v cc >/dev/null 2>&1 || die 'Linux builds need a C compiler on PATH (cc)'
    v -prod -gc boehm -d use_bundled_libgc -cc cc \
      -ldflags '-static -s' -o "$out" src/koh.v
    ;;
esac

echo "built $out"