Keil project, RTT cannot print after too many programs are written

One 、Options for Target,Code Generation The general default is Use default compiler version 5 , choice V6.14, Recompile the burning program , You can go on RTT Print .
It is amended as follows ：

Two 、 After compiling like this , Compilation speed is much faster , however , Select jump to the defined location in the project , Can't jump . The solution looks at the fourth point .

3、 ... and 、STM32CubeMX Build project , Compilation speed is slow . You can use the above method to improve the compilation speed , Switch compilation as needed ARM compiler . Of course , It's OK to change a better notebook (^_−)*

Four 、 problem ： The program cannot jump to the definition .
The file path cannot contain Chinese （ Chinese format punctuation marks ）, After global recompilation , Wait a minute or so to jump to the definition .