Re: [Qemu-devel] [PATCH v3 2/4] configure: factor out supported flag check

[Stefan Hajnoczi]

On Thu, Mar 19, 2015 at 03:01:35PM -0400, John Snow wrote:
> +cc_has_warning_flag() {
> +    if [ "$2" != "--keep-tmpc" ]; then
> +        write_c_skeleton;
> +    fi
> +
>      # Use the positive sense of the flag when testing for -Wno-wombat
>      # support (gcc will happily accept the -Wno- form of unknown
>      # warning options).
> -    optflag="$(echo $flag | sed -e 's/^-Wno-/-W/')"
> -    if compile_prog "-Werror $optflag" "" ; then
> -     QEMU_CFLAGS="$QEMU_CFLAGS $flag"
> +    optflag="$(echo $1 | sed -e 's/^-Wno-/-W/')"
> +    compile_prog "-Werror $optflag" ""
> +}
> +
> +write_c_skeleton;
> +for flag in $gcc_flags; do
> +    if cc_has_warning_flag $flag --keep-tmpc; then

The only caller that uses --keep-tmpc wants TMPC to be the skeleton
program anyway.  The option can be dropped and the write_c_skeleton in
cc_has_warning_flag can be unconditional.

Stefan

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