Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #!/bin/sh |
2 | # | |
3 | # Check whether linker can handle cross-segment @segrel(): | |
4 | # | |
5 | CPPFLAGS="" | |
6 | CC=$1 | |
7 | OBJDUMP=$2 | |
8 | READELF=$3 | |
9 | dir=$(dirname $0) | |
10 | tmp=${TMPDIR:-/tmp} | |
11 | out=$tmp/out$$ | |
12 | ||
13 | # Check whether cross-segment segment-relative relocs work fine. We need | |
14 | # that for building the gate DSO: | |
15 | ||
16 | $CC -nostdlib -static -Wl,-T$dir/check-segrel.lds $dir/check-segrel.S -o $out | |
17 | res=$($OBJDUMP --full --section .rodata $out | fgrep 000 | cut -f3 -d' ') | |
18 | rm -f $out | |
19 | if [ $res != 00000a00 ]; then | |
20 | CPPFLAGS="$CPPFLAGS -DHAVE_BUGGY_SEGREL" | |
21 | cat >&2 <<EOF | |
22 | warning: your linker cannot handle cross-segment segment-relative relocations. | |
23 | please upgrade to a newer version (it is safe to use this linker, but | |
24 | the kernel will be bigger than strictly necessary). | |
25 | EOF | |
26 | fi | |
27 | ||
28 | # Check whether .align inside a function works as expected. | |
29 | ||
30 | $CC -c $dir/check-text-align.S -o $out | |
31 | $READELF -u $out | fgrep -q 'prologue(rlen=12)' | |
32 | res=$? | |
33 | rm -f $out | |
34 | if [ $res -eq 0 ]; then | |
35 | CPPFLAGS="$CPPFLAGS -DHAVE_WORKING_TEXT_ALIGN" | |
36 | fi | |
37 | ||
38 | if ! $CC -c $dir/check-model.c -o $out 2>&1 | grep __model__ | grep -q attrib | |
39 | then | |
40 | CPPFLAGS="$CPPFLAGS -DHAVE_MODEL_SMALL_ATTRIBUTE" | |
41 | fi | |
42 | rm -f $out | |
43 | ||
44 | # Check whether assembler supports .serialize.{data,instruction} directive. | |
45 | ||
46 | $CC -c $dir/check-serialize.S -o $out 2>/dev/null | |
47 | res=$? | |
48 | rm -f $out | |
49 | if [ $res -eq 0 ]; then | |
50 | CPPFLAGS="$CPPFLAGS -DHAVE_SERIALIZE_DIRECTIVE" | |
51 | fi | |
52 | ||
53 | echo $CPPFLAGS |