Makefile: add AddressSanitizer to CFLAGS

This allows to build criu with AddressSanitizer enabled:

	make ASAN=1 -j<N>

travis-ci: success for series starting with [1/6] compel/infect: fix out-of-bounds parasite memcpy()
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Makefile

@@ -111,6 +111,12 @@ ifneq ($(GCOV),)
         CFLAGS          += $(CFLAGS-GCOV)
 endif
 
+ifeq ($(ASAN),1)
+	CFLAGS-ASAN	:= -fsanitize=address
+	export		CFLAGS-ASAN
+	CFLAGS		+= $(CFLAGS-ASAN)
+endif
+
 ifneq ($(WERROR),0)
         WARNINGS	+= -Werror
 endif

compel/plugins/Makefile

 .PHONY: .FORCE
 
 CFLAGS			:= $(filter-out -pg $(CFLAGS-GCOV),$(CFLAGS)) -DCR_NOGLIBC
+CFLAGS			:= $(filter-out $(CFLAGS-ASAN),$(CFLAGS))
 PLUGIN_ARCH_DIR		:= compel/arch/$(ARCH)/plugins
 
 #

criu/pie/Makefile

@@ -21,6 +21,7 @@ endif
 # project.
 #
 CFLAGS		:= $(filter-out -pg $(CFLAGS-GCOV),$(CFLAGS))
+CFLAGS		:= $(filter-out $(CFLAGS-ASAN),$(CFLAGS))
 CFLAGS		+= -iquote $(SRC_DIR)/criu/arch/$(ARCH)/include
 CFLAGS		+= -iquote $(SRC_DIR)/criu/include
 CFLAGS		+= -iquote $(SRC_DIR)/include

criu/pie/Makefile.library

@@ -41,6 +41,8 @@ iquotes			:= -iquote $(SRC_DIR)/$(PIE_DIR)/piegen
 iquotes			+= -iquote $(SRC_DIR)/$(ARCH_DIR)/include
 iquotes			+= -iquote $(SRC_DIR) -iquote $(SRC_DIR)/criu/include -iquote $(SRC_DIR)/include
 CFLAGS			:= $(filter-out -pg $(CFLAGS-GCOV),$(CFLAGS)) $(iquotes)
+CFLAGS			:= $(filter-out $(CFLAGS-ASAN),$(CFLAGS))
+
 asflags-y		:= -D__ASSEMBLY__ $(iquotes)
 ccflags-y		+= $(COMPEL_UAPI_INCLUDES)