Q153004: PRB: Error C2065: ‘__emul/__emulu’ : Undeclared Identifier

Article: Q153004
Product(s): Microsoft C Compiler
Version(s): winnt:4.0
Operating System(s): 
Keyword(s): kbVC kbHWPowerPC
Last Modified: 04-AUG-2001

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The information in this article applies to:

- Microsoft Visual C++, version 4.0, on platform(s):
   - the hardware: PowerPC Processor 
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SYMPTOMS
========

When compiling a file that includes the system header file LARGEINT.H, the
following errors are reported:

  C:\msdev\include\largeint.h(70) : error C2065: '__emul' :
  undeclared identifier

  C:\msdev\include\largeint.h(70) : error C2064: term does not
  evaluate to a function

  C:\msdev\include\largeint.h(87) : error C2065: '__emulu' :
  undeclared identifier

  C:\msdev\include\largeint.h(87) : error C2064: term does
  not evaluate to a function

CAUSE
=====

LARGEINT.H and LARGEINT.LIB are not fully supported in Visual C++ RISC edition
version 4.0 for the PowerPC.

RESOLUTION
==========

Use the compiler-supported __int64 data type (64-bit integer) in place of the
LARGE_INTEGER and ULARGE_INTEGER structures in LARGEINT.H that are used to
emulate a 64-bit integer.

STATUS
======

This behavior is by design.

MORE INFORMATION
================

The following is an excerpt from the header file LARGEINT.H that is included in
RISC edition of Visual C++ 4.0 for the Power PC:

  Note that this version (of LARGEINT.H) has not been completely tested. It is
  provided solely as an aid for portability. We strongly suggest the use of
  __int64 types in preference to LARGE_INTEGER.

All platforms supported by the 32-bit edition of Visual C++ 4.0 now support the
__int64 data type. For maximum portability and ease of use, the __int64 data
type should be used for all new code development. For existing code that uses
LARGEINT.H, a port to the __int64 data type will be necessary if the problem
mentioned above is encountered.

The header file LARGEINT.LIB and its associated library, LARGEINT.LIB, were
originally created for early versions of 32-bit Microsoft C/C++ compiler. These
versions of the compiler did not support a native 64-bit data type. Later
versions of the compiler were extended to add this data type, replacing the need
for the LARGE_INTEGER and ULARGE_INTEGER structures provided by LARGEINT.H.


Sample Code
-----------

     /* Compile options needed: CL TEST.CPP
     */ 

     #include <largeint.h>

     void main(void) {}

REFERENCES
==========

Please see the Microsoft Visual C++ 4.0 RISC edition for the PowerPC header file
LARGEINT.H.

Additional query words:

======================================================================
Keywords          : kbVC kbHWPowerPC 
Technology        : kbVCsearch kbAudDeveloper
Version           : winnt:4.0
Issue type        : kbprb

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