FIX: CXX0033 Error in OMF Type from Forward Class Declaration
ID: Q131147
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The information in this article applies to:
-
The C/C++ Compiler (CL.EXE), included with:
-
Microsoft Visual C++ for Windows, versions 1.0, 1.5, 1.51, 1.52
-
Microsoft Visual C++ 32-bit Edition, versions 1.0, 2.0, 2.1
SYMPTOMS
In the Visual C++ debugger, if you debug an application built using
precompiled header (PCH) options, the debugger's expression evaluator may
generate errors when viewing classes that were declared but not defined in
the precompiled header file.
One of the following errors may be generated depending on the Visual C++
version:
CXX0017 Error: symbol "xxxx" cannot be found
CXX0030 Error: expression cannot be evaluated
CXX0033 Error: error in OMF type information
CV1255 Error: no data members
NOTE: The first error message is very generic, and can occur for several
different reasons including this one.
CAUSE
When the compiler writes out type information into the program database
(.PDB) file, incomplete type information is written for the forward class
declaration when the full definition has not yet been compiled.
When the module containing the full class definition is compiled, the
complete type information is not replacing the incomplete type information
in the .PDB file.
RESOLUTION
Here are three possible workarounds:
- Turn off PCH usage. This avoids the problem altogether.
-or-
- Include the full definition of the class in .PCH file. This causes the
complete type information to be written to the .PDB file.
-or-
- Compile using C7 Compatible Debug Info switch (/Z7). This will not use
a .PDB file to store type information. You may also need to use the /Yd
option to include PCH debug information in all object modules.
STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed
at the beginning of this article. This problem was fixed in Microsoft
Visual C++, 32-bit Edition, version 4.0.
MORE INFORMATION
The following small sample application reproduces the problem. In the
Visual C++ integrated debugger, it is not possible to expand "A" in the
locals window, watch window, or with a quickwatch.
Sample Code to Demonstrate Problem
/* PCH.H
*/
class FwdNonPCHClass;
class PCHClass
{
public:
int i;
long l;
class FwdClass * FwdNonPCHClassPtr;
};
/*
STDPCH.CPP
Win32 Compile options needed: /Yc"pch.h" /Od /Zi /c
Win16 Compile options needed: /Yc"pch.h" /Od /Zi /Mq /c
*/
#include "pch.h"
/*
TEST.CPP
Win32 Compile options needed: /Yu"pch.h" /Od /Zi test.cpp stdpch.obj
Win16 Compile options needed: /Yu"pch.h" /Od /Zi /Mq test.cpp stdpch.obj
*/
#include "pch.h"
class FwdNonPCHClass
{
public:
int i;
long l;
};
void main(void)
{
FwdNonPCHClass A;
PCHClass B;
A.i = 1;
A.l = 17L;
B.i = 54;
B.l = 17L;
}
Additional query words:
1.00 1.50 1.51 1.52 1.52a 2.00 2.10 8.0 8.00 8.0c 8.00c 9.0 9.00 9.1 9.10
Keywords : kbCompiler kbDebug kbide
Version : winnt:
Platform : winnt
Issue type :