name : tools-support-relr.sh #!/bin/sh -eu # SPDX-License-Identifier: GPL-2.0 tmp_file=$(mktemp) trap "rm -f $tmp_file.o $tmp_file $tmp_file.bin" EXIT cat << "END" | $CC -c -x c - -o $tmp_file.o >/dev/null 2>&1 void *p = &p; END # ld.lld before 15 did not support -z pack-relative-relocs. if ! $LD $tmp_file.o -shared -Bsymbolic --pack-dyn-relocs=relr -o $tmp_file 2>/dev/null; then $LD $tmp_file.o -shared -Bsymbolic -z pack-relative-relocs -o $tmp_file 2>&1 | grep -q pack-relative-relocs && exit 1 fi # Despite printing an error message, GNU nm still exits with exit code 0 if it # sees a relr section. So we need to check that nothing is printed to stderr. test -z "$($NM $tmp_file 2>&1 >/dev/null)" $OBJCOPY -O binary $tmp_file $tmp_file.bin