#!/usr/bin/env bash

# Print the mcpp binary produced by the build that just ran, and REFUSE to

# guess. target/ accumulates one directory per toolchain fingerprint, so

# `find … | head -1` answers a build you did not make — this repository has

# been bitten by that shape repeatedly. The marker makes "which build" a fact.

#

# RUN THE E2E SUITE AGAINST THIS PATH, NOT AGAINST A COPY. mcpp resolves

# MCPP_HOME from the binary's own location, so a binary copied elsewhere is a

# different binary as far as several tests are concerned —

# `30_dev_binary_home.sh` fails on a copy and passes in place, which reads as a

# regression and is not one. The reason to want a copy (the suite must not be

# rebuilt underneath itself) is real; the answer is to not rebuild while it

# runs, not to move the binary.

set -euo pipefail

ROOT="$(cd "$(dirname "$0")/.." && pwd)"

MARK="$ROOT/target/.dev-mcpp-marker"

case "${1:-}" in

mark) mkdir -p "$ROOT/target"; : > "$MARK"; exit 0 ;;

esac

[[ -f "$MARK" ]] || { echo "no marker: run '$0 mark' before the build" >&2; exit 1; }

mapfile -t hits < <(find "$ROOT/target" -type f -name mcpp -perm -u+x -newer "$MARK")

if (( ${#hits[@]} != 1 )); then

echo "expected exactly one freshly built mcpp, found ${#hits[@]}:" >&2

printf ' %s\n' "${hits[@]}" >&2

exit 1

fi

printf '%s\n' "${hits[0]}"