#!/bin/sh## Check whether linker can handle cross-segment @segrel():#CPPFLAGS=""CC=$1OBJDUMP=$2READELF=$3dir=$(dirname $0)tmp=${TMPDIR:-/tmp}out=$tmp/out$$ # Check whether cross-segment segment-relative relocs work fine.  We need# that for building the gate DSO: $CC -nostdlib -static -Wl,-T$dir/check-segrel.lds $dir/check-segrel.S -o $outres=$($OBJDUMP --full --section .rodata $out | fgrep 000 | cut -f3 -d' ')rm -f $outif [ $res != 00000a00 ]; then    CPPFLAGS="$CPPFLAGS -DHAVE_BUGGY_SEGREL"    cat >&2 <<EOFwarning: your linker cannot handle cross-segment segment-relative relocations.         please upgrade to a newer version (it is safe to use this linker, but         the kernel will be bigger than strictly necessary).EOFfi # Check whether .align inside a function works as expected. $CC -c $dir/check-text-align.S -o $out$READELF -u $out | fgrep -q 'prologue(rlen=12)'res=$?rm -f $outif [ $res -eq 0 ]; then    CPPFLAGS="$CPPFLAGS -DHAVE_WORKING_TEXT_ALIGN"fi if ! $CC -c $dir/check-model.c -o $out 2>&1 | grep  __model__ | grep -q attribthen    CPPFLAGS="$CPPFLAGS -DHAVE_MODEL_SMALL_ATTRIBUTE"firm -f $out # Check whether assembler supports .serialize.{data,instruction} directive. $CC -c $dir/check-serialize.S -o $out 2>/dev/nullres=$?rm -f $outif [ $res -eq 0 ]; then    CPPFLAGS="$CPPFLAGS -DHAVE_SERIALIZE_DIRECTIVE"fi echo $CPPFLAGS