#########################################################################
#
-# Option checker (courtesy linux kernel) to ensure
+# Option checker, gcc version (courtesy linux kernel) to ensure
# only supported compiler options are used
#
-cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
- > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
+CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk
+CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o
+
+-include $(CC_OPTIONS_CACHE_FILE)
+
+cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \
+ if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \
+ > /dev/null 2>&1; then \
+ echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \
+ echo "$(1)"; fi)
+
+ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y)
+cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2))
+else
+cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\
+ $(if $(call cc-option-sys,$1),$1,$2)))
+endif
+
+# cc-version
+# Usage gcc-ver := $(call cc-version)
+cc-version = $(shell $(SHELL) $(SRCTREE)/tools/gcc-version.sh $(CC))
#
# Include the make variables (CC, etc...)
$(call cc-option,-Wno-format-security)
CFLAGS += $(CFLAGS_WARN)
+# Report stack usage if supported
+CFLAGS_STACK := $(call cc-option,-fstack-usage)
+CFLAGS += $(CFLAGS_STACK)
+
# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
# option to the assembler.
AFLAGS_DEBUG :=