Print the value of a local variable through GDB

Question

while debugging I need to print the value of a variable that is declared in the else block. something like this :

if(condition){ 

}
else {
string str = "abcd";
strcpy(globalvariable,str,sizeOf(str));
}

I want to see the value of str.

Sunil Bojanapally · Accepted Answer · 2013-11-07 11:45:08Z

3

Run the program inside the debugger.
Set break point to stop the execution of program sequence using break command. In your case, (gdb) break strcpy to break every time it is being called strcpy in else.
To print you can use any of the following, x str, x/s str, print str, print "%s", str.

answered Nov 7, 2013 at 11:45

Sunil Bojanapally

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1 Comment

user1619508 Over a year ago

I just wanted to add that it may be necessary to turn off compiler optimization if you expect this variable to actually exist in the executable code.

ks1322 · Accepted Answer · 2013-11-07 16:07:14Z

0

You can't see the value of str if condition is true during program flow because it does not exist in memory in this case.
You have to enter else block somehow, either during normal program flow or using gdb jump command.

answered Nov 7, 2013 at 16:07

ks1322

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