| # Check whether linker can handle cross-segment @segrel(): |
| # 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' ') |
| if [ $res != 00000a00 ]; then |
| CPPFLAGS="$CPPFLAGS -DHAVE_BUGGY_SEGREL" |
| 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). |
| # Check whether .align inside a function works as expected. |
| $CC -c $dir/check-text-align.S -o $out |
| $READELF -u $out | fgrep -q 'prologue(rlen=12)' |
| CPPFLAGS="$CPPFLAGS -DHAVE_WORKING_TEXT_ALIGN" |
| if ! $CC -c $dir/check-model.c -o $out 2>&1 | grep __model__ | grep -q attrib |
| CPPFLAGS="$CPPFLAGS -DHAVE_MODEL_SMALL_ATTRIBUTE" |
| # Check whether assembler supports .serialize.{data,instruction} directive. |
| $CC -c $dir/check-serialize.S -o $out 2>/dev/null |
| CPPFLAGS="$CPPFLAGS -DHAVE_SERIALIZE_DIRECTIVE" |