How to print a variable on a particular condition in gdb?

Question

I wish to print the variable in a function (which is called multiple times ) to be printed each time the function is invoked.

Is it possible to do this automatically through gdb ?? Something like conditional printing ...

something like ..

void func()
{ 
    if( t == 0 ) 
       x = z+1;
    else
       x = p+2; 
} 

I want the variable to be printed when t == 0 and ignore otherwise ..

Answer 1

This can be done with a combination of the commands breakpoint, condition, and commands.

1. Set a breakpoint with breakpoint func
2. Make it conditional by condition t == 0
3. Make the breakpoint print local variables with:

.

commands  
info locals  
end  

or specific variables with:

commands  
print t
print z
print x  
end