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https://github.com/torvalds/linux
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17c568d60a
Compile the correct gcov implementation file for the specific gcc version. Signed-off-by: Frantisek Hrbata <fhrbata@redhat.com> Cc: Jan Stancek <jstancek@redhat.com> Cc: Kees Cook <keescook@chromium.org> Acked-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Andy Gospodarek <agospoda@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
33 lines
1.2 KiB
Makefile
33 lines
1.2 KiB
Makefile
ccflags-y := -DSRCTREE='"$(srctree)"' -DOBJTREE='"$(objtree)"'
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# if-lt
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# Usage VAR := $(call if-lt, $(a), $(b))
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# Returns 1 if (a < b)
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if-lt = $(shell [ $(1) -lt $(2) ] && echo 1)
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ifeq ($(CONFIG_GCOV_FORMAT_3_4),y)
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cc-ver := 0304
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else ifeq ($(CONFIG_GCOV_FORMAT_4_7),y)
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cc-ver := 0407
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else
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# Use cc-version if available, otherwise set 0
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#
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# scripts/Kbuild.include, which contains cc-version function, is not included
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# during make clean "make -f scripts/Makefile.clean obj=kernel/gcov"
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# Meaning cc-ver is empty causing if-lt test to fail with
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# "/bin/sh: line 0: [: -lt: unary operator expected" error mesage.
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# This has no affect on the clean phase, but the error message could be
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# confusing/annoying. So this dummy workaround sets cc-ver to zero if cc-version
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# is not available. We can probably move if-lt to Kbuild.include, so it's also
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# not defined during clean or to include Kbuild.include in
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# scripts/Makefile.clean. But the following workaround seems least invasive.
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cc-ver := $(if $(call cc-version),$(call cc-version),0)
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endif
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obj-$(CONFIG_GCOV_KERNEL) := base.o fs.o
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ifeq ($(call if-lt, $(cc-ver), 0407),1)
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obj-$(CONFIG_GCOV_KERNEL) += gcc_3_4.o
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else
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obj-$(CONFIG_GCOV_KERNEL) += gcc_4_7.o
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endif
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