Re: [Qemu-devel] [qemu-s390x] [PATCH v2] configure: Only build the s390-ccw bios if the compiler supports -march=z900

[Christian Borntraeger <borntraeger@de.ibm.com>]

On 14.01.2019 13:52, Thomas Huth wrote:
> We want to build our s390-ccw bios with -march=z900 so that it also
> works with the oldest s390x CPU that we support with TCG. However,
> Clang on s390x does not support -march=z900 anymore, so we can not
> use this compiler to build the s390-ccw bios. Thus add a proper test
> to the configure script to see whether the compiler is usable.
> 
> Signed-off-by: Thomas Huth <thuth@redhat.com>

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>

> ---
>  v2: Use compile_prog as suggested by Peter
> 
>  configure | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/configure b/configure
> index 05b7e85..2b9ba7d 100755
> --- a/configure
> +++ b/configure
> @@ -5905,8 +5905,12 @@ if test "$cpu" = "ppc64" -a "$targetos" != "Darwin" ; then
>    roms="$roms spapr-rtas"
>  fi
>  
> +# Only build s390-ccw bios if we're on s390x and the compiler has -march=z900
>  if test "$cpu" = "s390x" ; then
> -  roms="$roms s390-ccw"
> +  write_c_skeleton
> +  if compile_prog "-march=z900" ""; then
> +    roms="$roms s390-ccw"
> +  fi
>  fi
>  
>  # Probe for the need for relocating the user-only binary.
>