PRB: Undocumented Compiler Switches /QIfdiv, /QIf, and /QI6

 Last reviewed: July 25, 1997
Article ID: Q155173
The information in this article applies to:
  • The Microsoft C/C++ Compiler (CL.EXE) included with: - Microsoft Visual C++, 32-bit Edition, versions 4.0, 4.1, 4.2

SYMPTOMS

In Visual C++ version 4.0, the compiler switches /QIfdiv, /Qif, and /QI6 are not documented. In Visual C++ version 4.1, the switch /QIfdiv is now documented. Below is a list of the default behavior of each switch in Visual C++ version 4.0 and version 4.1.

MORE INFORMATION

/QIfdiv - This switch is turned on by default in VC 4.0. It is turned 

          off (/QIfdiv-) by default in VC 4.1. /QIfdiv is a workaround
          for the Pentium floating-point bug. /QIfdiv causes emulator
          functions to be used.
/QIf - This switch is unchanged. /QIf forces the .debug$F FPO debug 
       information to be output always. This allows a backtrace of the
       stack even when some of the kernel stack has been paged out.
/QI6 - This was an undocumented switch to work around P6 problems and 
       it was off by default in VC 4.0. This switch was removed in VC 4.1
       but its functionality is still there and is turned on by default.

Version           : 4.0 4.1 4.2
Platform          : NT WINDOWS
Issue type        : kbprb
Solution Type     : kbfix

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Last reviewed: July 25, 1997
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