native: add address sanitizer make target

boards/native/Makefile.include

@@ -90,6 +90,9 @@ all-debug: export CFLAGS += -g
 all-cachegrind: export CFLAGS += -g
 all-gprof: export CFLAGS += -pg
 all-gprof: export LINKFLAGS += -pg
+all-asan: export CFLAGS += -fsanitize=address -fno-omit-frame-pointer -g
+all-asan: export CFLAGS += -DNATIVE_IN_CALLOC
+all-asan: export LINKFLAGS += -fsanitize=address -fno-omit-frame-pointer -g
 
 export INCLUDES += $(NATIVEINCLUDES)
 
@@ -121,6 +124,8 @@ all-debug: all
 
 all-gprof: all
 
+all-asan: all
+
 all-valgrind: all
 
 all-cachegrind: all

cpu/native/syscalls.c

@@ -149,7 +149,11 @@ void free(void *ptr)
     _native_syscall_leave();
 }
 
+#ifdef NATIVE_IN_CALLOC
+int _native_in_calloc = 1;
+#else
 int _native_in_calloc = 0;
+#endif
 void *calloc(size_t nmemb, size_t size)
 {
     /* dynamically load calloc when it's needed - this is necessary to