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gcov: compile specific gcov implementation based on gcc version
Compile the correct gcov implementation file for the specific gcc version. Signed-off-by: Frantisek Hrbata <[email protected]> Cc: Jan Stancek <[email protected]> Cc: Kees Cook <[email protected]> Acked-by: Peter Oberparleiter <[email protected]> Cc: Rusty Russell <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Andy Gospodarek <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,3 +1,33 @@ | ||
ccflags-y := -DSRCTREE='"$(srctree)"' -DOBJTREE='"$(objtree)"' | ||
|
||
obj-$(CONFIG_GCOV_KERNEL) := base.o fs.o gcc_3_4.o | ||
# 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 |