arch/ia64/scripts/toolchain-flags

   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