FIX: C1001, file 'fppeeps.c', line 394, Caused By /Og

• The C/C++ Compiler (CL.EXE), included with:
  • Microsoft Visual C++, 32-bit Editions, version 5.0

SYMPTOMS

Compiling the sample code below may cause the following error:

   ttt.cpp(10) : fatal error C1001: INTERNAL COMPILER ERROR
                (compiler file 'E:\utc\src\\P2\x86\fppeeps.c', line 394) 

CAUSE

This internal compiler error is caused by global optimizations which is enabled by the /Og option. The /O1 (minimize space), /O2 (maximize speed), and /Ox (maximum opts.) options include the /Og switch so those may also cause this C1001 error.

RESOLUTION

Enabling the /Op (improve floating-pt consistency) optimization, or disabling the /Og optimization, either at the command line or by use of #pragma optimize will avoid the C1001 error. A more intrusive workaround would be to change the floats to doubles.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been corrected in Visual Studio 97 Service Pack 1.

For additional information about the Visual Studio 97 Service Pack 1, please see the following article in the Microsoft Knowledge Base:

Q170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why

MORE INFORMATION

The following code demonstrates one form of this C1001 error. Use /Og- or /Ogp as a workaround.

SAMPLE CODE

   // cl /c /Og
   float gf1, gf2, gf3;
   float func( float *pf2, float f, float f1, float f2, float f3 )
   {
       f3 = f * (*pf2);
       gf3 = f3;
       gf2 = f2;
       gf1 = f1;
       return f;
   } 

Additional query words:

Keywords : kbVS97sp1fix kbVS97sp2fix
Version : 5.0
Platform : NT WINDOWS
Issue type : kbbug