kernel/gcov/Makefile

   1 ccflags-y := -DSRCTREE='"$(srctree)"' -DOBJTREE='"$(objtree)"'
   2
   3 # if-lt
   4 # Usage VAR := $(call if-lt, $(a), $(b))
   5 # Returns 1 if (a < b)
   6 if-lt = $(shell [ $(1) -lt $(2) ] && echo 1)
   7
   8 ifeq ($(CONFIG_GCOV_FORMAT_3_4),y)
   9   cc-ver := 0304
  10 else ifeq ($(CONFIG_GCOV_FORMAT_4_7),y)
  11   cc-ver := 0407
  12 else
  13 # Use cc-version if available, otherwise set 0
  14 #
  15 # scripts/Kbuild.include, which contains cc-version function, is not included
  16 # during make clean "make -f scripts/Makefile.clean obj=kernel/gcov"
  17 # Meaning cc-ver is empty causing if-lt test to fail with
  18 # "/bin/sh: line 0: [: -lt: unary operator expected" error mesage.
  19 # This has no affect on the clean phase, but the error message could be
  20 # confusing/annoying. So this dummy workaround sets cc-ver to zero if cc-version
  21 # is not available. We can probably move if-lt to Kbuild.include, so it's also
  22 # not defined during clean or to include Kbuild.include in
  23 # scripts/Makefile.clean. But the following workaround seems least invasive.
  24   cc-ver := $(if $(call cc-version),$(call cc-version),0)
  25 endif
  26
  27 obj-$(CONFIG_GCOV_KERNEL) := base.o fs.o
  28
  29 ifeq ($(call if-lt, $(cc-ver), 0407),1)
  30   obj-$(CONFIG_GCOV_KERNEL) += gcc_3_4.o
  31 else
  32   obj-$(CONFIG_GCOV_KERNEL) += gcc_4_7.o
  33 endif