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Reputation: 3235

GDB: manipulate string convenient variables

I am wondering if this is feasible at all - I define 2 convenient variables and like to construct the 3rd one based on the two, I just tried the following:

(gdb) set $a=12
(gdb) set $b=34
(gdb) set $c=$a$b
(gdb) p $c
 $1 = void
(gdb) show convenience 
$a$b = void
$c = void
$b = 34
$a = 12
$_siginfo = void

My goal is to create variable c whose value is "1234", can this be done at all in GDB?

A related question, can I dynamically define source file search path based on the current directory? "Dynamic" in the sense I can define a GDB user command which calls "dir" command and give its arguments some directories based on the current directory. Based on my current investigation, I cannot use build-in gdb mechanism, I have write a shell script and call gdb shell command to do that.

Upvotes: 2

Views: 1391

Answers (1)

Employed Russian
Employed Russian

Reputation: 213526

My goal is to create variable c whose value is "1234", can this be done at all in GDB?

(gdb) set $c = 1234
(gdb) set $d = 100*$a + $b

Presumably you wanted to concatenate $a and $b, but these are integer variables, and concatenating them makes (almost) no sense.

Upvotes: 1

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