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# PRB: Debugging: Inter-Operability with Visual C++ 2.0

PSS ID Number: 123370

Article Last Modified on 10/30/1999

The information in this article applies to:

- Microsoft Fortran Powerstation 32 for Windows NT 1.0

This article was previously published under Q123370

## SYMPTOMS

An attempt to link Visual C++ 2.0 objects using the FORTRAN PowerStation 1.0 linker fails giving this CVPACK error:
CVPACK : fatal error CK1022: cannot open program database <path>xx.pdb
LINK : warning LNK4027: CVPACK error
LINK returned code: 1
The xx is the base name of the Visual C++ .OBJ file and the error indicates that the linker cannot read the debug information in the Visual C++ object.

## CAUSE

Microsoft Visual C++ 2.0 takes advantages of a new debug information format (the PDB file), which is not available with the linker shipped with Microsoft FORTRAN PowerStation 1.0.
NOTE: This problem was corrected in FORTRAN PowerStation32, version 4.0.

## RESOLUTION

There are two ways to work around this problem. If you want to use the FORTRAN PowerStation 1.0 linker, you must compile your C/C++ programs with the old style (CV4) debug information. To do this, use the '-Z7' switch, instead of the '-Zi' switch on the Visual C++ command line. The debug information, from your C object, is now in the CV4 format recognizable by the FORTRAN PowerStation linker. This will allow you to debug the executable from FORTRAN PowerStation 1.0.
Alternatively, you can use the Visual C++ version 2.0 linker that understands both CV4 and PDB format debug information. This will allow you to debug your executable from Visual C++ version 2.0. However, FORTRAN expression evaluator is not available with the Visual C++ version 2.0 debugger.
NOTE: To use the Visual C++ version 2.0 linker, you can either use the C++ cl command and provide the appropriate FORTRAN libraries on the command line, or you can include the FORTRAN object (.OBJ) and static library (.LIB) files by listing them in the Project Files, by using the "Project + Files" menu selection.

Keywords: kbprb KB123370
Technology: kbAudDeveloper kbFORTRANPower32100NT kbFortranSearch kbZNotKeyword2