| #!/bin/sh | |
| # | |
| # Check whether linker can handle cross-segment @segrel(): | |
| # | |
| CPPFLAGS="" | |
| CC=$1 | |
| OBJDUMP=$2 | |
| READELF=$3 | |
| dir=$(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 $out | |
| res=$($OBJDUMP --full --section .rodata $out | fgrep 000 | cut -f3 -d' ') | |
| rm -f $out | |
| if [ $res != 00000a00 ]; then | |
| CPPFLAGS="$CPPFLAGS -DHAVE_BUGGY_SEGREL" | |
| cat >&2 <<EOF | |
| warning: 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). | |
| EOF | |
| fi | |
| # 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 $out | |
| if [ $res -eq 0 ]; then | |
| CPPFLAGS="$CPPFLAGS -DHAVE_WORKING_TEXT_ALIGN" | |
| fi | |
| if ! $CC -c $dir/check-model.c -o $out 2>&1 | grep __model__ | grep -q attrib | |
| then | |
| CPPFLAGS="$CPPFLAGS -DHAVE_MODEL_SMALL_ATTRIBUTE" | |
| fi | |
| rm -f $out | |
| # Check whether assembler supports .serialize.{data,instruction} directive. | |
| $CC -c $dir/check-serialize.S -o $out 2>/dev/null | |
| res=$? | |
| rm -f $out | |
| if [ $res -eq 0 ]; then | |
| CPPFLAGS="$CPPFLAGS -DHAVE_SERIALIZE_DIRECTIVE" | |
| fi | |
| echo $CPPFLAGS |