Merge pull request #3363 from BsAtHome/fix_Os-to-O2

Change optimize -Os to -O2

src/Makefile

@@ -251,7 +251,7 @@ INCLUDE += $(LIBTIRPC_CFLAGS)
 
 # Compilation options.	Perhaps some of these should come from Makefile.inc? (CXXFLAGS now does)
 INTEGER_OVERFLOW_FLAGS := -fwrapv
-OPT := -Os $(INTEGER_OVERFLOW_FLAGS)
+OPT := -O2 $(INTEGER_OVERFLOW_FLAGS)
 DEBUG := $(DEBUG) -g -Wall -D_FORTIFY_SOURCE=2
 CFLAGS := $(INCLUDE) $(OPT) $(DEBUG) -DULAPI -std=gnu11 -Werror=implicit-function-declaration $(CFLAGS) $(CPPFLAGS) $(EXTRA_DEBUG)
 CXXFLAGS := $(INCLUDE) $(OPT) $(DEBUG) -DULAPI -Werror=overloaded-virtual $(CXXFLAGS) $(CPPFLAGS) $(EXTRA_DEBUG)
@@ -1240,7 +1240,7 @@ tpmod-objs += libnml/posemath/sincos.o $(MATHSTUB)
 
 TORTOBJS = $(foreach file,$($(patsubst %.o,%,$(1))-objs), objects/rt$(file))
 ifeq ($(BUILD_SYS),uspace)
-EXTRA_CFLAGS += -fPIC -Os
+EXTRA_CFLAGS += -fPIC -O2 $(filter -Wextra,$(CFLAGS)) $(filter -Werror,$(CFLAGS))
 RTOBJS := $(sort $(foreach mod,$(obj-m),$(call TORTOBJS,$(mod))))
 RTDEPS := $(sort $(RTOBJS:.o=.d))