PRB: Cannot Use /Zp Compiler Option With DB-Library

ID: Q37667

The information in this article applies to:

Microsoft SQL Server Programmer's Toolkit, version 4.2

SYMPTOMS

DB-Library (DB-Lib) programs compiled with /Zp (pack structure members) can produce General Protection Faults (GP-Faults) and unpredictable results. The problem seems to be limited to DB-Lib macros such as dbcurrow(), dbfirstrow(), and dbrowtype().

CAUSE

DB-Lib has been compiled with default structure alignment. If the user program is compiled with an incompatible pack option, DB-Lib macros will be generated with incorrect offsets, resulting in unpredictable results.

WORKAROUND

If the user program must be compiled with /Zp, the problem can be circumvented by putting pragma statements around the include for "sqldb" to force word alignment offsets to be generated when DB-Lib macros reference that structure.

Additional query words: dblib


Keywords          : kbprg SSrvDB_Lib 
Version           : WINDOWS:4.2
Platform          : WINDOWS 
Issue type        :

Last Reviewed: March 6, 1999