Microsoft KB Archive/115526

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BUG: C1001: Internal Compiler Error: pgoMD2.c, Line 681

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Q115526

1.00 1.50 WINDOWS kbtool kbbuglist -- The information in this article applies to: - The Microsoft C/C++ Compiler (CL.EXE), included with: - Microsoft Visual C++ for Windows, versions 1.0 and 1.5 -- SYMPTOMS ======== Compiling the sample code shown below using the /Ot, /Ob2, or /Gr options causes the optimizing compiler to generate the following error: fatal error C1001: internal compiler error (compiler file '@(#)pgoMD2.c:1.23', line 681) Compiling the sample code with the switches listed above also causes the compiler to generate the following warning: warning C4124: __fastcall with stack checking is inefficient However, compiling the code with /Gs to turn off stack checking does not avoid the C1001 error. RESOLUTION ========== To avoid the problem, do one of the following: - Do not use one of the /Ot, /Ob2, or /Gr options. Removing any one of these options allows the code to compile successfully. The options can be removed at the module level by not specifying them on the compile command line. They can also be removed at the function level by using #pragma optimize directives in the source code. The sample code shown below illustrates this technique. -or- - Use the fast compiler because the problem only occurs with the optimizing compiler. Use of the fast compiler can be forced with the /f compiler switch. STATUS ====== Microsoft has confirmed this to be a bug in the Microsoft products listed above. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available. This is not a problem in Visual C++, 32-bit Edition. MORE INFORMATION ================ Sample Code --- /* Compile options needed: /Otb2 /Gr */ #include int main(void); int fail_count = 0; void fail(int line) { printf("failed line %d\n",line); fail_count++; } void checke (int a, int b) { if (a != b) printf ("Not equal\n"); } typedef int (*func_ptr_elip_arg)(...); typedef int (*func_ptr_uint_arg)(unsigned); int f(unsigned); int g(func_ptr_elip_arg p) { return p(1); } int g(func_ptr_uint_arg p) { return p(2); } int f(unsigned u) { return u * 4; } // Uncomment the following pragma to allow this to compile //#pragma optimize ( "", off ) int main(void) { checke(g((int(*)(...))&f),4); if(!fail_count) printf("passed\n"); return fail_count; } Additional reference words: 1.00 1.50 8.00 8.00c KBCategory: kbtool kbbuglist KBSubcategory: CLIss

Keywords : kb16bitonly

Issue type : kbbug

Technology : kbVCsearch kbAudDeveloper kbCVCComp