DOCUMENT:Q122302 29-JUL-2001 [visualc] TITLE :FIX: C1001 Error Compiling Naked Function with /Og and /G5 PRODUCT :Microsoft C Compiler PROD/VER::2.0 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- 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 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.