Provide the option to enable debug information during tar backups

Change-Id: Ibdb060d334c8f799a283f1bcef4a369d5555c975

libtar/Android.mk

@@ -25,6 +25,10 @@ ifeq ($(TW_INCLUDE_CRYPTO_FBE), true)
     endif
 endif
 
+ifeq ($(TW_LIBTAR_DEBUG),true)
+    LOCAL_CFLAGS += -DTW_LIBTAR_DEBUG
+endif
+
 include $(BUILD_SHARED_LIBRARY)
 
 # Build static library
@@ -52,4 +56,8 @@ ifeq ($(TW_INCLUDE_CRYPTO_FBE), true)
     endif
 endif
 
+ifeq ($(TW_LIBTAR_DEBUG),true)
+    LOCAL_CFLAGS += -DTW_LIBTAR_DEBUG
+endif
+
 include $(BUILD_STATIC_LIBRARY)

libtar/block.c

@@ -18,6 +18,10 @@
 # include <stdlib.h>
 #endif
 
+#ifdef TW_LIBTAR_DEBUG
+#define DEBUG 1
+#endif
+
 #ifdef HAVE_EXT4_CRYPT
 #include "ext4crypt_tar.h"
 #endif