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

[Thomas Huth]

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 <address@hidden>
---
 configure | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 05b7e85..df34974 100755
--- a/configure
+++ b/configure
@@ -5906,7 +5906,10 @@ if test "$cpu" = "ppc64" -a "$targetos" != "Darwin" ; 
then
 fi
 
 if test "$cpu" = "s390x" ; then
-  roms="$roms s390-ccw"
+  # Only build the s390-ccw bios if the compiler supports -march=z900
+  if "$cc" -dumpspecs 2>/dev/null | grep -q "march=z900"; then
+    roms="$roms s390-ccw"
+  fi
 fi
 
 # Probe for the need for relocating the user-only binary.
-- 
1.8.3.1