optionrom: cope with multiple -O options
Reproducer:
CFLAGS="-g3 -O0" ./configure --target-list=aarch64-softmmu,arm-softmmu --enable-vhost-net --enable-virtfs
Here CFLAGS ends up with "-O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 ... -g3 -O0"
and pc-bios/optionrom/Makefile forgets to add the -O2 it needs.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/pc-bios/optionrom/Makefile b/pc-bios/optionrom/Makefile
index 9bdc4979..afa48f1 100644
--- a/pc-bios/optionrom/Makefile
+++ b/pc-bios/optionrom/Makefile
@@ -10,10 +10,7 @@
.PHONY : all clean build-all
# Compiling with no optimization creates ROMs that are too large
-ifeq ($(filter -O%, $(CFLAGS)),)
-override CFLAGS += -O2
-endif
-ifeq ($(filter -O%, $(CFLAGS)),-O0)
+ifeq ($(lastword $(filter -O%, -O0 $(CFLAGS))),-O0)
override CFLAGS += -O2
endif
