1 #!/bin/sh -eu 1 #!/bin/sh -eu
2 # SPDX-License-Identifier: GPL-2.0 2 # SPDX-License-Identifier: GPL-2.0
3 3
4 tmp_file=$(mktemp) 4 tmp_file=$(mktemp)
5 trap "rm -f $tmp_file.o $tmp_file $tmp_file.bi 5 trap "rm -f $tmp_file.o $tmp_file $tmp_file.bin" EXIT
6 6
7 cat << "END" | $CC -c -x c - -o $tmp_file.o >/ 7 cat << "END" | $CC -c -x c - -o $tmp_file.o >/dev/null 2>&1
8 void *p = &p; 8 void *p = &p;
9 END 9 END
10 !! 10 $LD $tmp_file.o -shared -Bsymbolic --pack-dyn-relocs=relr -o $tmp_file
11 # ld.lld before 15 did not support -z pack-rel <<
12 if ! $LD $tmp_file.o -shared -Bsymbolic --pack <<
13 $LD $tmp_file.o -shared -Bsymbolic -z <<
14 grep -q pack-relative-relocs & <<
15 fi <<
16 11
17 # Despite printing an error message, GNU nm st 12 # Despite printing an error message, GNU nm still exits with exit code 0 if it
18 # sees a relr section. So we need to check tha 13 # sees a relr section. So we need to check that nothing is printed to stderr.
19 test -z "$($NM $tmp_file 2>&1 >/dev/null)" 14 test -z "$($NM $tmp_file 2>&1 >/dev/null)"
20 15
21 $OBJCOPY -O binary $tmp_file $tmp_file.bin 16 $OBJCOPY -O binary $tmp_file $tmp_file.bin
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