GDB Debug macro definition and display macro-defined values

Macro Definition #define APLLCON0 * (volatile unsigned int *) 0xff500100), value is virtual address

question :

GDB tracing Debug When you want to view the value of this macro, you are prompted as follows: No symbol "APLLCON0" in the current context.

Analysis :

Reference http://blog.csdn.net/jibing57/article/details/7439631

The compiler does not compile the macro definition extension information into a binary file by default.

View the description through man GCC, as follows

You need to add-gdwarf-2 and-g3 two parameters at compile time.

When GCC compiles, the extended debug information is compiled into the binary file, including the macro definition information, when the-G3 parameter is added.

Conclusion :

Add-g3-gdwarf-2 parameter after cflags parameter

Recompile, GDB debug macros, as follows