ifneq ($(SAN),)
	ifeq ($(GCC),1)
		_:=$(error Cannot build for SAN=$(SAN) with GCC=1)
	endif
	CLANG=1
endif

ifeq ($(SAN),memory)
    ifneq ($(MSAN_PREFIX),)
        MSAN_PREFIX=/opt/llvm-project/build-msan
		ifeq ($(wildcard $(MSAN_PREFIX)),)
			_:=$(error LLVM/MSAN stdlibc++ directory '$(MSAN_PREFIX)' is missing)
        endif
    endif
endif

CC_FLAGS.asan=-fno-omit-frame-pointer -fsanitize=address -fsanitize-recover=all 
ifneq ($(SAN_IGNORELIST),)
CC_FLAGS.asan += -fsanitize-blacklist=$(SAN_IGNORELIST)
endif
LD_FLAGS.asan=-fsanitize=address

CC_FLAGS.tsan=-fno-omit-frame-pointer -fsanitize=thread -pie
LD_FLAGS.tsan=-fsanitize=thread

CC_FLAGS.msan=-fno-omit-frame-pointer -fsanitize=memory -fsanitize-memory-track-origins=2
CXX_FLAGS.msan=$(CC_FLAGS.msan) -stdlib=libc++ -I$(MSAN_PREFIX)/include -I$(MSAN_PREFIX)/include/c++/v1
LD_FLAGS.msan=-fsanitize=memory -stdlib=libc++ -Wl,-rpath=$(MSAN_PREFIX)/lib -L$(MSAN_PREFIX)/lib -lc++abi

ifeq ($(SAN),address)
	CC_FLAGS.sanitizer += $(CC_FLAGS.asan)
	LD_FLAGS.sanitizer += $(LD_FLAGS.asan)

else ifeq ($(SAN),memory)
	CC_FLAGS.sanitizer += $(CC_FLAGS.msan)
	CC_CXX_FLAGS.sanitizer += $(CXX_FLAGS.msan)
	LD_FLAGS.sanitizer += $(LD_FLAGS.msan)

else ifeq ($(SAN),thread)
	CC_FLAGS.sanitizer += $(CC_FLAGS.tsan)
	LD_FLAGS.sanitizer += $(LD_FLAGS.tsan)
endif