kpatch/kpatch-build/kpatch-gcc

#!/bin/bash

set -x

TOOLCHAINCMD="$1"
shift

if [[ -z "$KPATCH_GCC_TEMPDIR" ]]; then
    exec "$TOOLCHAINCMD" "$@"
fi

declare -a args=("$@")

if [[ "$TOOLCHAINCMD" = "gcc" ]] ; then
	while [ "$#" -gt 0 ]; do
		if [ "$1" = "-o" ]; then
			obj=$2

			# skip copying the temporary .o files created by
			# recordmcount.pl
			[[ $obj = */.tmp_mc_*.o ]] && break;

			[[ $obj = */.tmp_*.o ]] && obj=${obj/.tmp_/}
			case "$obj" in
				*.mod.o|\
				*built-in.o|\
				vmlinux.o|\
				.tmp_kallsyms1.o|\
				.tmp_kallsyms2.o|\
				init/version.o|\
				arch/x86/boot/version.o|\
				arch/x86/boot/compressed/eboot.o|\
				arch/x86/boot/header.o|\
				arch/x86/boot/compressed/efi_stub_64.o|\
				arch/x86/boot/compressed/piggy.o|\
				kernel/system_certificates.o|\
				arch/x86/vdso/*|\
				arch/x86/entry/vdso/*|\
				drivers/firmware/efi/libstub/*|\
				arch/powerpc/kernel/prom_init.o|\
				.*.o|\
				*/.lib_exports.o)
					break
					;;
				*.o)
					mkdir -p "$KPATCH_GCC_TEMPDIR/orig/$(dirname $obj)"
					[[ -e $obj ]] && cp -f "$obj" "$KPATCH_GCC_TEMPDIR/orig/$obj"
					echo "$obj" >> "$KPATCH_GCC_TEMPDIR/changed_objs"
					break
					;;
				*)
					break
					;;
			esac
		fi
		shift
	done
elif [[ "$TOOLCHAINCMD" = "ld" ]] ; then
	while [ "$#" -gt 0 ]; do
		if [ "$1" = "-o" ]; then
			obj=$2
			case "$obj" in
				*.ko)
					mkdir -p "$KPATCH_GCC_TEMPDIR/module/$(dirname $obj)"
					cp -f "$obj" "$KPATCH_GCC_TEMPDIR/module/$obj"
					break
					;;
				.tmp_vmlinux*|vmlinux)
					args+=(--warn-unresolved-symbols)
					break
					;;
				*)
					break
					;;
			esac
		fi
		shift
	done
fi

exec "$TOOLCHAINCMD" "${args[@]}"