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Victor Chibotaru d677a4d601 Makefile: support flag -fsanitizer-coverage=trace-cmp

The flag enables Clang instrumentation of comparison operations
(currently not supported by GCC).  This instrumentation is needed by the
new KCOV device to collect comparison operands.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Victor Chibotaru <[email protected]>
Signed-off-by: Alexander Potapenko <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Andrey Konovalov <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Alexander Popov <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Vegard Nossum <[email protected]>
Cc: Quentin Casasnovas <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

2017-11-17 16:10:04 -08:00

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Makefile

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 ifdef CONFIG_KCOV
 CFLAGS_KCOV	:= $(call cc-option,-fsanitize-coverage=trace-pc,)
 ifeq ($(CONFIG_KCOV_ENABLE_COMPARISONS),y)
 CFLAGS_KCOV += $(call cc-option,-fsanitize-coverage=trace-cmp,)
 endif
 endif