Change the Android source code and compile the problems encountered

Problem one: No need to compile all the code every time can use mm command and mmm command, mm command is to compile all the modules in the current directory, to Android.mk to determine a module, that is, a module has a android.mk file, The MMM command is a compilation of all modules under the directory.

Issue two: The module is compiled, and the system.img image is not written, and the Make Snod command is run to regenerate the image

Question three: The logs in the code in Android are available for display using adb logcat *:i > 3.log This sentence refers to the output of all log.i above the log

Change the Android source code and compile the problems encountered