Simplifies optimization / debugging levels

Now only use them for compilation since they don't do anything on other steps of the build.

Makefile.defines

@@ -55,6 +55,16 @@ ifeq ($(SYSROOT),)
 endif
 CFLAGS   += --sysroot="$(SYSROOT)"
 
+# optimization and debugging levels
+ifneq ($(DEBUG),0)
+    OPTI_LVL  = g
+    DBG_LVL   = 3
+else
+    OPTI_LVL  = z
+    DBG_LVL   = 0
+endif
+CFLAGS   += -O$(OPTI_LVL) -g$(DBG_LVL)
+
 CFLAGS   += -fomit-frame-pointer -momit-leaf-frame-pointer
 
 CFLAGS   += -fno-common -mlittle-endian

Makefile.rules

@@ -93,25 +93,4 @@ OBJECTS_DIR += $(sort $(dir $(OBJECT_FILES)))
 DEPEND_FILES = $(subst $(OBJ_DIR), $(DEP_DIR), $(addsuffix .d, $(basename $(OBJECT_FILES))))
 DEPEND_DIR += $(sort $(dir $(DEPEND_FILES)))
 
-# optimization and debug levels
-# this should be in Makefile.defines, but $(AS) is not yet defined at that point
-ifneq ($(DEBUG),0)
-    OPTI_LVL  = -Og
-    OPTI_ALVL = $(OPTI_LVL)
-    DBG_LVL   = -g3
-else
-    OPTI_LVL  = -Oz
-    ifeq ($(AS),$(CLANGPATH)clang)
-        OPTI_ALVL = $(OPTI_LVL)
-    else
-        # GCC assembler does not handle -Oz
-        OPTI_ALVL = -Os
-    endif
-    DBG_LVL   = -g0
-endif
-# at the beginning so they can be overridden by apps
-CFLAGS   := $(OPTI_LVL) $(DBG_LVL) $(CFLAGS)
-AFLAGS   := $(OPTI_ALVL) $(DBG_LVL) $(AFLAGS)
-LDFLAGS  := $(OPTI_LVL) $(DBG_LVL) $(LDFLAGS)
-
 include $(BOLOS_SDK)/Makefile.rules_generic