[PATCH 4/5] configure: check for SLOF submodule before building pc-bios/s390-ccw

[Paolo Bonzini <pbonzini@redhat.com>]

SLOF is required for building the s390-ccw firmware on s390x,
since it is using the libnet code from SLOF for network booting.

If SLOF is absent and submodules are not updated, pc-bios/s390-ccw
cannot be built.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 configure | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 1d1b8736c0eb..c92a3b30b9a4 100755
--- a/configure
+++ b/configure
@@ -1662,7 +1662,8 @@ fi
 
 # Only build s390-ccw bios if the compiler has -march=z900 or -march=z10
 # (which is the lowest architecture level that Clang supports)
-if have_target s390x-softmmu && probe_target_compiler s390x-softmmu; then
+if have_target s390x-softmmu && probe_target_compiler s390x-softmmu && \
+    ( test "$git_submodules_action" != ignore || test -f roms/SLOF/VERSION ); then
   write_c_skeleton
   do_compiler "$target_cc" $target_cc_cflags -march=z900 -o $TMPO -c $TMPC
   has_z900=$?
-- 
2.40.1