#!/usr/bin/env bash
# brintmake — run make against this toolchain, with the conftest knob OFF.
#
# The other half of bin/brintconfigure. It sets the same CC/CXX/AR/RANLIB so a
# package is built by the compiler it was probed with, and it does NOT set
# WASMLD_HWJS_CONFTEST — the whole point of the pair.
#
# It also REFUSES if it finds that knob set in the environment, which is the
# footgun this pair exists to close. WASMLD_HWJS_CONFTEST=1 fast-links with
# plain wasm-ld and never runs the pass; a build that inherits it from an
# earlier `export` produces objects that link, pass their tests on the host,
# and cannot fork or be preempted at run time. Nothing downstream detects that,
# so it is caught here, where the value is still visible.
#
# Usage:
#   brintmake [--libc=musl|glibc] [make args...]
set -euo pipefail
# readlink -f, not dirname alone: these front doors are meant to be symlinked
# into a prefix on PATH, and a symlink's dirname is the prefix, not this repo.
source "$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")/../libexec/config.sh"

LIBC=''
if [ $# -gt 0 ]; then
  case "$1" in
    --libc=*) LIBC="$(brintium_parse_libc_opt "$1")"; shift ;;
  esac
fi

case "${WASMLD_HWJS_CONFTEST:-0}" in
  0) ;;
  *) brintium_fatal \
       "WASMLD_HWJS_CONFTEST='$WASMLD_HWJS_CONFTEST' is set in this environment. It belongs to a ./configure run and to nothing else: it fast-links with plain wasm-ld, so the coroutinize pass never runs and every object this build produced would be un-forkable and un-preemptible while still linking clean. Unset it (bin/brintconfigure scopes it to the configure process for exactly this reason) and build again." ;;
esac

# Where the Makefile is: honor make's own -C and -f before deciding, so the
# refusal below can never fire on a build that was going to work.
DIR='.'
MAKEFILE=''
prev=''
for a in "$@"; do
  case "$prev" in
    -C) DIR="$a" ;;
    -f|--file|--makefile) MAKEFILE="$a" ;;
  esac
  case "$a" in
    -C*) [ "$a" = -C ] || DIR="${a#-C}" ;;
    -f*) [ "$a" = -f ] || MAKEFILE="${a#-f}" ;;
    --file=*|--makefile=*) MAKEFILE="${a#*=}" ;;
  esac
  prev="$a"
done

[ -d "$DIR" ] || brintium_fatal "no such directory '$DIR' (make -C)."
if [ -n "$MAKEFILE" ]; then
  [ -f "$DIR/$MAKEFILE" ] || [ -f "$MAKEFILE" ] || brintium_fatal \
    "no makefile at '$MAKEFILE' (make -f, from $PWD)."
else
  found=''
  for m in GNUmakefile makefile Makefile; do
    [ -f "$DIR/$m" ] && { found="$m"; break; }
  done
  [ -n "$found" ] || brintium_fatal \
    "no GNUmakefile, makefile or Makefile in '$DIR' (from $PWD). Configure the package first — bin/brintconfigure — or point make at one with -f. Refusing rather than letting make report it: make's own message does not say which toolchain it was about to use, and this one does."
fi

brintium_require llvm sysroot
if [ "$LIBC" = glibc ]; then brintium_require kernel-headers; fi
brintium_export_build_tools "$LIBC"

exec make "$@"