C/C++ printfs - Where's it appears in a Android native code?

Question

Since It's pretty hard to debug native android code, I'm going to the "printf trace" approach.

So, my question is, in a native code, wheres the standards "printf("something")" appears when running a Android application?

Answer 1

Log to logcat.

1) To invoke the logger in native code include the header and call _android_log_write(..).

#include <android/log.h>  __android_log_write(ANDROID_LOG_INFO, "tag here", "message here"); 

2) In your Android.mk file include the log lib like this.

LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog