I have the following line of code:
int a = MAX(b,c);
How to check the definition of the MAX(b,c) macro? Sometimes the same macro is defined in several different ways in a code (for example, depending on the architecture). This would help in these cases.
First, compile the program with the -g3 flag, to ask gcc to include all levels of debug information, including macro expansions.
In gdb, use the macro expand command to expand the macro. For example,
#define MAX(x, y) (((x) > (y)) ? (x) : (y))
No gdb:
(gdb) expand macro MAX(a,b)
>> (((a) > (b)) ? (a) : (b))
To see the value of a define, use the command info macro MACRO .