can not set breakpoint in release mode

**George2** · 07-13-2008

Hello everyone,

For the following code, I can not set breakpoint in release mode, but the same command in WinDbg works fine in debug mode. Anything wrong?

Here is my Windbg command and output in release mode and source codes. I have tested in release mode breakpoint at foo does not take effect, but in debug mode it takes effect.

Code:

0:000> bp foo
Bp expression 'foo' could not be resolved, adding deferred bp
0:000> bp main
0:000> bl
 0 eu                      0001 (0001) (foo)
 1 e 00000001`40001000     0001 (0001)  0:**** Test64bitDebug!main

int foo (int a, int b)
{
 return a+b;
}
int main()
{
 int a1 = 100;
 int b1 = a1 + 100;
 a1 = foo (a1, b1);
 return 0;
}

thanks in advance,
George

**vart** · 07-13-2008

Probably - in the release mode the line of code does not exists in the exe - removed by the code optimizer... So you'll need to find a line that was not removed and put th ebreakpoint there

**VirtualAce** · 07-15-2008

Not really a good idea to rely on breakpoints in release mode or for that matter try to debug while in release mode.

**iMalc** · 07-16-2008

If you don't mind setting the breakpoints at compile time you can use this instead

Code:

__asm { int 3};

**matsp** · 07-16-2008

Originally Posted by vart

Probably - in the release mode the line of code does not exists in the exe - removed by the code optimizer... So you'll need to find a line that was not removed and put th ebreakpoint there

Yes, it could for example have inlined the function, and if the function is also static, there would be no function to set a breakpoint in. Study the assembler output of the generated code to determine what happened during the compile phase.

--
Mats

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