[PATCH 3/4] kasan: support LLVM-style asan parameters

[Greg Hackmann]

Use cc-option to figure out whether the compiler's sanitizer uses
LLVM-style parameters ("-mllvm -asan-foo=bar") or GCC-style parameters
("--param asan-foo=bar").

Signed-off-by: Greg Hackmann <ghackm...@google.com>
---
 scripts/Makefile.kasan | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan
index 9576775a86f6..b66ae4b4546b 100644
--- a/scripts/Makefile.kasan
+++ b/scripts/Makefile.kasan
@@ -9,11 +9,19 @@ KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
 
 CFLAGS_KASAN_MINIMAL := -fsanitize=kernel-address
 
-CFLAGS_KASAN := $(call cc-option, -fsanitize=kernel-address \
+CFLAGS_KASAN_GCC := $(call cc-option, -fsanitize=kernel-address \
                -fasan-shadow-offset=$(KASAN_SHADOW_OFFSET) \
                --param asan-stack=1 --param asan-globals=1 \
                --param 
asan-instrumentation-with-call-threshold=$(call_threshold))
 
+CFLAGS_KASAN_LLVM := $(call cc-option, -fsanitize=kernel-address \
+               -mllvm -asan-mapping-offset=$(KASAN_SHADOW_OFFSET) \
+               -mllvm -asan-stack=1 -mllvm -asan-globals=1 \
+               -mllvm -asan-use-after-scope=1 \
+               -mllvm 
-asan-instrumentation-with-call-threshold=$(call_threshold))
+
+CFLAGS_KASAN := $(CFLAGS_KASAN_GCC) $(CFLAGS_KASAN_LLVM)
+
 ifeq ($(call cc-option, $(CFLAGS_KASAN_MINIMAL) -Werror),)
    ifneq ($(CONFIG_COMPILE_TEST),y)
         $(warning Cannot use CONFIG_KASAN: \
-- 
2.13.2.725.g09c95d1e9-goog