BUG: Wrong Exception Re-thrown with Global Optimization

 Last reviewed: April 10, 1997
Article ID: Q166719
The information in this article applies to:
  • The C/C++ Compiler (CL.EXE) included with: - Microsoft Visual C++, 32-bit Editions, version 5.0

SYMPTOMS

The wrong exception is re-thrown when global optimization (/Og) is enabled. For example, in the following sample, the correct output is: 

    A 1st throw
    B 2nd throw
    C 1st throw
However, if global optimization (/Og) is enabled, the output is: 

    A 1st throw
    B 2nd throw
    C 2nd throw

RESOLUTION

To work around the problem, disable the global optimization on the command line or use the optimize pragma to disable the optimization for the function where the problem occurs. For example: 

    #pragma optimize("g", off)

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Sample Code

    //test.cpp
    /* Compiler options needed : /GX  */
    #include <iostream>
    using namespace std;
    #pragma optimize("g", on)
    void main() {
        try
        {
            char* pStr = NULL;
            try
            {
                throw "1st throw\n";
            }
            catch( char* str )
            {
                cout << "A " << str;
                try
                {
                    throw "2nd throw\n";
                }
                catch( char* str )
                {
                    cout <<"B "<< str;
                }
                throw;
            }
        }
        catch ( char* str )
        {
            cout <<"C "<< str;
        }
    }

Keywords : CPPIss kbcode kbtool vcbuglist500 kbbuglist
Version : 5.0
Platform : NT WINDOWS
Issue type : kbbug

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Last reviewed: April 10, 1997
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