Support logging debug information to logcat on Android.

src/debug.h

 
 //#define DEBUG_ENABLED
 
+#ifdef ANDROID
+
+#include <android/log.h>
+#define LOG_TAG "eSpeak"
+
 #ifdef DEBUG_ENABLED
+#define ENTER(text) __android_log_print(ANDROID_LOG_VERBOSE, LOG_TAG, text)
+#define SHOW(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
+#else
+#define ENTER(text)
+#define SHOW(format,...)
+#endif
+
+#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
+#define SHOW_TIME(text)
+
+#else
+
+#ifdef DEBUG_ENABLED
+
 #define ENTER(text) debug_enter(text)
 #define SHOW(format,...) debug_show(format,__VA_ARGS__);
+#define LOGE(format,...) debug_show(format,__VA_ARGS__);
 #define SHOW_TIME(text) debug_time(text);
+
 extern void debug_enter(const char* text);
 extern void debug_show(const char* format,...);
 extern void debug_time(const char* text);
 
 #ifdef NO_VARIADIC_MACROS
 #define SHOW(format)   // VC6 doesn't allow "..."
+#define LOGE(format)   // VC6 doesn't allow "..."
 #else
 #define SHOW(format,...)
+#define LOGE(format,...)
 #endif
+
 #define SHOW_TIME(text)
 #define ENTER(text)
-#endif
-
 
 #endif
+#endif
+#endif