#!/usr/bin/env bash
set -euo pipefail
unset MAKEFLAGS MFLAGS GNUMAKEFLAGS
make_bin=$(command -v gmake || command -v make)
m() { "$make_bin" --no-print-directory -rR "$@"; }
work_dir=$(mktemp -d)
if [ "${KEEP_WORK:-0}" = 1 ]; then
  trap 'printf "Artifacts: %s\n" "$work_dir"' EXIT
else
  trap 'rm -rf -- "$work_dir"' EXIT
fi
cd "$work_dir"
export TMPDIR="$work_dir"
mkdir -p data
cat > data/input.txt <<'INPUT_41_1'
found record
INPUT_41_1
cat > Makefile <<'MAKEFILE'
vpath %.txt data
copy.txt: input.txt
	@printf "input=%s\n" "$<"
	@cp $< $@
MAKEFILE
m -s copy.txt
cat copy.txt