1#!/bin/sh 2# 3# Check whether linker can handle cross-segment @segrel(): 4# 5CPPFLAGS="" 6CC=$1 7OBJDUMP=$2 8READELF=$3 9dir=$(dirname $0) 10tmp=${TMPDIR:-/tmp} 11out=$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 $out 17res=$($OBJDUMP --full --section .rodata $out | fgrep 000 | cut -f3 -d' ') 18rm -f $out 19if [ $res != 00000a00 ]; then 20 CPPFLAGS="$CPPFLAGS -DHAVE_BUGGY_SEGREL" 21 cat >&2 <<EOF 22warning: 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). 25EOF 26fi 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 $out | fgrep -q 'prologue(rlen=12)' 32res=$? 33rm -f $out 34if [ $res -eq 0 ]; then 35 CPPFLAGS="$CPPFLAGS -DHAVE_WORKING_TEXT_ALIGN" 36fi 37 38if ! $CC -c $dir/check-model.c -o $out 2>&1 | grep __model__ | grep -q attrib 39then 40 CPPFLAGS="$CPPFLAGS -DHAVE_MODEL_SMALL_ATTRIBUTE" 41fi 42rm -f $out 43 44# Check whether assembler supports .serialize.{data,instruction} directive. 45 46$CC -c $dir/check-serialize.S -o $out 2>/dev/null 47res=$? 48rm -f $out 49if [ $res -eq 0 ]; then 50 CPPFLAGS="$CPPFLAGS -DHAVE_SERIALIZE_DIRECTIVE" 51fi 52 53echo $CPPFLAGS 54