enable system's my_malloc/calloc/realloc/free via compile time option

Makefile

@@ -9,6 +9,11 @@ RANLIB ?= $(CROSS)ranlib
 STRIP ?= $(CROSS)strip
 
 CFLAGS += -fPIC -O3 -Wall -Iinclude
+
+ifeq ($(USE_SYS_DYN_MEM),yes)
+CFLAGS += -DUSE_SYS_DYN_MEM
+endif
+
 LDFLAGS += -shared
 
 PREFIX ?= /usr

config.mk

@@ -1,3 +1,9 @@
+# Comment out the line below 'USE_SYS_DYN_MEM = yes' if you do not want to use
+# system's malloc()/calloc()/realloc()/free() for internal dynamic memory management.
+# NOTE: in that case, your program must specify your own malloc/calloc/realloc/free
+# functions with cs_option(), using CS_OPT_MEM option type.
+USE_SYS_DYN_MEM = yes
+
 # Specify which archs you want to compile in
 CAPSTONE_ARCHS =
 

cs.c

@@ -16,10 +16,17 @@ void (*arch_destroy[MAX_ARCH]) (cs_struct *) = { NULL };
 
 unsigned int all_arch = 0;
 
+#ifdef USE_SYS_DYN_MEM
 malloc_t my_malloc = malloc;
 calloc_t my_calloc = calloc;
 realloc_t my_realloc = realloc;
 free_t my_free = free;
+#else
+malloc_t my_malloc = NULL;
+calloc_t my_calloc = NULL;
+realloc_t my_realloc = NULL;
+free_t my_free = NULL;
+#endif
 
 unsigned int cs_version(int *major, int *minor)
 {