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Q122302: FIX: C1001 Error Compiling Naked Function with /Og and /G5

Article: Q122302
Product(s): Microsoft C Compiler
Version(s): 2.0
Operating System(s): 
Keyword(s): 
Last Modified: 29-JUL-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft C/C++ Compiler (CL.EXE), included with:
   - *EDITOR Please do not choose this product*Microsoft Visual C++ 32-bit Edition* use 241, 265, 225, version 2.0, on platform(s):
      - the hardware: Intel x86 
-------------------------------------------------------------------------------

SYMPTOMS
========

Compiling a function with the __declspec(naked) modifier, but without an __asm
block for the epilog code, and using the /Og and /G5 switches, results in the
following error:

  fatal error C1001: INTERNAL COMPILER ERROR
  (compiler file 'l:\b_bld\c2\P2\main.c', line 374)
  Please choose the Technical Support command on the Visual C++ Help menu, or
  open the Technical Support help file for more information

RESOLUTION
==========

Implement a epilog code block in your function.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article. This problem was fixed in Microsoft Visual C++,
32-bit Edition, version 4.0.

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

If a function is declared with the __declspec(naked) modifier, the compiler will
not generate any prolog or epilog code. Users should implement their own prolog
and epilog code, using blocks of inline assembler code.

NOTE: without proper prolog and epilog code, the code will not execute
correctly.

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

  /* Compile options needed: /Og /G5
     Note that /O1, /O2, and /Ox all imply /Og
  */ 

  void __declspec(naked) NakedFunction()
  {
      __asm
      {
      // prolog code
      }

      printf( "Inside naked function\n" );

      // note: epilog __asm block missing
  }

Additional query words: 2.00 9.00 buglist2.00

======================================================================
Keywords          :  
Technology        : kbVCsearch kbAudDeveloper kbCVCComp
Version           : :2.0
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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