minwin-gcc-5-2/gcc/config/x-cflags-O1

# At -O0 cc1 etc. are too large on some targets for successful
# link; force building libbackend.a with -O1.
ifeq ($(filter-out -O0,$(lastword $(filter -O%,$(CFLAGS)))),)
$(OBJS) : override CFLAGS += -O1
endif