Warnings from Bison seem less likely to be urgent, but on general
principle enable everything.

Signed-off-by: Elliott Mitchell <ehem+xen@m5p.com>
---
 tools/libs/util/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/libs/util/Makefile b/tools/libs/util/Makefile
index c3b21875dc..d2c90ced69 100644
--- a/tools/libs/util/Makefile
+++ b/tools/libs/util/Makefile
@@ -50,7 +50,7 @@ $(OBJS-y) $(PIC_OBJS): libxlu_cfg_l.c libxlu_cfg_y.c libxlu_disk_l.c
 
 %.c %.h:: %.y
 	@rm -f $*.[ch]
-	$(BISON) --output=$*.c $<
+	$(BISON) -Wall --output=$*.c $<
 
 %.c %.h:: %.l
 	@rm -f $*.[ch]
-- 
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