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ccflags-y := -DSRCTREE='"$(srctree)"' -DOBJTREE='"$(objtree)"' # if-lt # Usage VAR := $(call if-lt, $(a), $(b)) # Returns 1 if (a < b) if-lt = $(shell [ $(1) -lt $(2) ] && echo 1) ifeq ($(CONFIG_GCOV_FORMAT_3_4),y) cc-ver := 0304 else ifeq ($(CONFIG_GCOV_FORMAT_4_7),y) cc-ver := 0407 else # Use cc-version if available, otherwise set 0 # # scripts/Kbuild.include, which contains cc-version function, is not included # during make clean "make -f scripts/Makefile.clean obj=kernel/gcov" # Meaning cc-ver is empty causing if-lt test to fail with # "/bin/sh: line 0: [: -lt: unary operator expected" error mesage. # This has no affect on the clean phase, but the error message could be # confusing/annoying. So this dummy workaround sets cc-ver to zero if cc-version # is not available. We can probably move if-lt to Kbuild.include, so it's also # not defined during clean or to include Kbuild.include in # scripts/Makefile.clean. But the following workaround seems least invasive. cc-ver := $(if $(call cc-version),$(call cc-version),0) endif obj-$(CONFIG_GCOV_KERNEL) := base.o fs.o ifeq ($(call if-lt, $(cc-ver), 0407),1) obj-$(CONFIG_GCOV_KERNEL) += gcc_3_4.o else obj-$(CONFIG_GCOV_KERNEL) += gcc_4_7.o endif