#!/bin/bash
# Usage: create a file foo.c, make foo a symlink to this script
# When foo is executed, this script silently compiles foo.c into .make-and-exec-binaries/foo (if necessary) and execs that with the arguments provided.
# Making a symlink named foo-dbg causes it to compile foo.c with -DDEBUG.
# To customise the compilation, you can set a CFLAGS env var before running foo.
sourcename="${0%-dbg}.c"
if [[ "$0" == *-dbg ]]; then opt='-Og -fsanitize=undefined,address -DDEBUG'; else opt='-O3'; fi
targetfile="$(dirname "$0")/.make-and-exec-binaries/$(basename "$0")"
if [[ ! -f "${targetfile}" || "${sourcename}" -nt "${targetfile}" || "${BASH_SOURCE}" -nt "${targetfile}" ]]; then
	mkdir -p "$(dirname "$0")/.make-and-exec-binaries"
	gcc -Wall -Wextra -Wshadow -Werror ${opt} ${CFLAGS} -o "${targetfile}" "${sourcename}" || exit
	testfile="$(dirname "$0")/.$(basename "${0%-dbg}")-test"
	if [[ -f "${testfile}" ]]; then
		"${testfile}" || { st=$?; touch -d '1970-01-01T00:00:00Z' "${targetfile}"; exit "${st}"; }
	fi
fi
exec "${targetfile}" "$@"