#!/bin/sh

REAL_AR=binutils-ar
PARENT="$(readlink /proc/$PPID/exe)"
WRAPPED=false

# If /proc isn't mounted, let's do the least evil thing we can
if [ -z "$PARENT" ]; then
    WRAPPED=true
# If we're being called by gcc-ar or llvm-ar, we're already
# wrapped (and need to make sure we don't call ourselves recursively)
elif echo "$PARENT" |grep -qE -- '-ar$'; then
    WRAPPED=true
# Fun... We're running inside qemu binfmt_misc emulation,
# so we have to determine our parent the evil and less
# reliable way...
elif echo "$PARENT" |grep -qE -- 'qemu'; then
    if grep -qE -- '-ar' /proc/$PPID/cmdline; then
		WRAPPED=true
    fi
fi
if ! "$WRAPPED"; then

	which llvm-ar &>/dev/null && IS_LLVM_AR=true
	which gcc-ar &>/dev/null && IS_GCC_AR=true
	for i in "$@"; do
		[ "$(echo $i |cut -b1)" = '-' ] && continue
		if echo "$i" | grep -qE '\.(o|ol|ao)$' && [ -e "$i" ]; then
			if LANG=C file "$i" |grep -q "LLVM IR bitcode"; then
				if [[ -n "$IS_LLVM_AR" ]]; then
					REAL_AR=llvm-ar
					break
				else
					echo "${0}-wrapper ERROR: LLVM-LTO code but missing llvm-ar, cannot continue!"
					exit 1
				fi
			fi

			if LANG=C readelf -s "$i" | grep -q "gnu_lto"; then
				if [[ -n "$IS_GCC_AR" ]]; then
					REAL_AR=gcc-ar
					break
				else
					echo "${0}-wrapper ERROR: GCC-LTO code but missing gcc-ar, cannot continue!"
					exit 1
				fi
			fi
		fi
    done
fi
exec "$REAL_AR" "$@"