Debug vs Release

Question

I have the following code:

#pragma optimize("", off)

DG704API_API bool DIG704IsUSBEx(IN BYTE rack)
{
volatile bool retVal(true);

  try
  {
    // Validate rack
    if ((rack < 1) || (rack > gpData.num70X))
    {
      OutputDebugMsg(DBG_ERROR_LEVEL, "DIG704IsUSBEx: rack out of hardware range");
      throw (ERROR_INVALID_RACK);  // Throw rack error
    }

    // The DIG-704s should always be first in the list
    if (rack <= ((BYTE)gpData.num704))
      retVal = false;               // We are a DIG-704 so return false

    if (retVal)
      OutputDebugMsg(DBG_INFO_LEVEL, "Rack %d is a DIG-705", rack);
    else
      OutputDebugMsg(DBG_INFO_LEVEL, "Rack %d is a DIG-704", rack);
  }
  catch(int error)
  {
    retVal = false;
  }

  return (retVal);
}

#pragma optimize("", on)

In Debug Mode if the card is a DIG-704 it returns false. In Release Mode if the card is a DIG-704 it returns true.

In the software/hardware that I am using I have one DIG-704. rack = 1 gpData.num704 = 1

It should return false, but when I look at the value returned it is true and when I step through the code it skips over the line retVal = false; There is no exception being thrown.

gpData is a data structure that is effectively global to the entire program. num704 is declared as an int.

My first guess was that the code was being optimized out so I tried to turn off optimizations, but adding the #pragma and volatile had no affect.

I'm at a loss as to what to try next.

Answer 1

The problem was not with the function. The problem was with the Pascal code that was calling the function. For a function declaration I had:

Function DIG704IsUSBEx(rack: BYTE): Bool; cdecl; External 'DG704API.dll';

It needed to be:

Function DIG704IsUSBEx(rack: BYTE): Boolean; cdecl; External 'DG704API.dll';

I guess that I didn't include enough information for anybody to answer the question. I tried my best and I didn't think Pascal was the problem because when I stepped through the function in Release mode I saw it just skip over the code.

Thank you to everybody who tried to help.