Q60338: PRB: Unable to Set CodeView Breakpoint on Desired Line

Article: Q60338
Product(s): Microsoft Programming Utilities
Version(s): 
Operating System(s): 
Keyword(s): 
Last Modified: 26-JUN-2001

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The information in this article applies to:

- Microsoft CodeView for MS-DOS 
- Microsoft CodeView for Windows 
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SYMPTOMS
========

In CodeView, an attempt to set a breakpoint on a specified line fails.

CAUSE
=====

The compiler command line did not specify both the /Od and /Zi option switches.
Some compiler optimizations concatenate code in the executable file unless the
command line specifies /Od to disable all optimizations.

RESOLUTION
==========

Recompile the code with the correct options specified.

MORE INFORMATION
================

The code example below demonstrates this problem. When the code is compiled with
only the /Zi switch, you cannot set a breakpoint on the indicated line.

Sample Code
-----------

  /*
   * Compile options needed: /Zi
   */ 

  #include <stdio.h>

  int func();

  void main(void)
  {
     int a, b, c;

     a = func();  // You cannot set a breakpoint on this line because
                  // the default optimization concatenates it with the
                  // following line to form the expression:
                  //    b = (a = func()) + c
     b = a + c;
  }

  int func()
  {
     return(10);
  }

Additional query words: 3.00 3.50 4.00 4.10

======================================================================
Keywords          :  
Technology        : kbAudDeveloper kbCodeView kbZNotKeyword3
Version           : :

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