pc-bios/s390-ccw: Allow building with Clang, too

Clang unfortunately does not support generating code for the z900
architecture level and starts with the z10 instead. Thus to be able
to support compiling with Clang, we have to check for the supported
compiler flags. The disadvantage is of course that the bios image
will only run with z10 guest CPUs upwards (which is what most people
use anyway), so just in case let's also emit a warning in that case
(we will continue to ship firmware images that have been pre-built
with GCC in future releases, so this should not impact normal users,
too).

Message-Id: <20210502174836.838816-5-thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/configure b/configure
index 4f374b4889..5ebc937746 100755
--- a/configure
+++ b/configure
@@ -5417,9 +5417,16 @@ if { test "$cpu" = "i386" || test "$cpu" = "x86_64"; } && \
 fi
 
 # Only build s390-ccw bios if we're on s390x and the compiler has -march=z900
+# or -march=z10 (which is the lowest architecture level that Clang supports)
 if test "$cpu" = "s390x" ; then
   write_c_skeleton
-  if compile_prog "-march=z900" ""; then
+  compile_prog "-march=z900" ""
+  has_z900=$?
+  if [ $has_z900 = 0 ] || compile_prog "-march=z10" ""; then
+    if [ $has_z900 != 0 ]; then
+      echo "WARNING: Your compiler does not support the z900!"
+      echo "         The s390-ccw bios will only work with guest CPUs >= z10."
+    fi
     roms="$roms s390-ccw"
     # SLOF is required for building the s390-ccw firmware on s390x,
     # since it is using the libnet code from SLOF for network booting.