-#if defined(TARGET_ASM_CONSTRUCTOR) && defined(TARGET_ASM_DESTRUCTOR)
-#define TARGET_HAVE_CTORS_DTORS true
-#else
-#define TARGET_HAVE_CTORS_DTORS false
-#define TARGET_ASM_CONSTRUCTOR NULL
-#define TARGET_ASM_DESTRUCTOR NULL
+#if !defined(TARGET_HAVE_CTORS_DTORS)
+# if defined(TARGET_ASM_CONSTRUCTOR) && defined(TARGET_ASM_DESTRUCTOR)
+# define TARGET_HAVE_CTORS_DTORS true
+# else
+# define TARGET_HAVE_CTORS_DTORS false
+# define TARGET_ASM_CONSTRUCTOR NULL
+# define TARGET_ASM_DESTRUCTOR NULL
+# endif