PATCH: PR bootstrap/53472: contrib/compare-debug should strip out .comment section

[Paolo Bonzini]

> 2012-05-24  H.J. Lu  <hongjiu.lu@intel.com>
>
>        PR bootstrap/53472
>        * contrib/compare-debug (remove_comment): New function.
>        Remove any .comment sections if the first cmp failed.

Ok.

Paolo

> diff --git a/contrib/compare-debug b/contrib/compare-debug
> index 010d17f..fb8986d 100755
> --- a/contrib/compare-debug
> +++ b/contrib/compare-debug
> @@ -73,11 +73,35 @@ Darwin)
>   ;;
>  esac
>
> +remove_comment ()
> +{
> +  file=$1
> +  opts=
> +  for s in `objdump --section-headers "$file" | awk '{ print $2 }'`; do
> +    case "$s" in
> +    .comment*)
> +      opts="$opts --remove-section $s"
> +      ;;
> +    esac
> +  done
> +  [ -n "$opts" ] && objcopy $opts $file
> +}
> +
>  if cmp "$1.$suf1" "$2.$suf2"; then
>   status=0
>  else
>   status=1
>
> +  # Remove any .comment sections.
> +  if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null \
> +     && (objdump --help) 2>&1 | grep ' --\[*section-\]*headers' >
> /dev/null; then
> +    remove_comment "$1.$suf1"
> +    remove_comment "$2.$suf2"
> +    if cmp "$1.$suf1" "$2.$suf2"; then
> +      status=0
> +    fi
> +  fi
> +
>   # Assembler-generated CFI will add an .eh_frame section for -g not
>   # present in -g0.  Try to cope with it by checking that an .eh_frame
>   # section is present in either object file, and then stripping it
>