Microsoft KB Archive/115850

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FIX: C4713 Internal Compiler Error, file reg86.c, line 2934

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Q115850

1.00 WINDOWS kbtool kbfixlist kbbuglist -- The information in this article applies to: - The Microsoft C/C++ Compiler (CL.EXE), included with: - Microsoft Visual C++ for Windows, version 1.0 -- SYMPTOMS ======== The optimizing C/C++ compiler generates the following internal compiler error message when the sample code below is compiled with the /Ox or /Oe compiler options: warning C4713: test: internal compiler error; restarting ( compiler file '@(#)reg86.c:1.26', line 2934 ) CAUSE ===== The internal compiler error message is caused by using the global register allocation optimization. This is only a warning message. The compiler restarts the compile without the optimization after it realizes a problem has occurred due to the global register allocation optimization. RESOLUTION ========== There are four workarounds to avoid the warning message: 1. Use the fast compiler option /f. -or- 2. Remove the /Oe compiler option to disable the global register allocation. If /Ox is used, /Oe is automatically invoked. If other optimizations invoked by /Ox are still needed, do the follows: a. Take out /Ox from the compiler options. b. Add the following options: /Ob1 /Oc /Og /Oi /Ol /On /Oo /Ot /Gs -or- 3. Use the optimize pragma to disable /Oe before the function where the error occurs. For example: #pragma optimize("e", off ) short test( PSTRUCTURE ptr ) { /* ... */ } #pragma optimize( "",on ) 4. In the sample below, swap lines 16 and 17. This has no semantic impact on the code. STATUS ====== Microsoft has confirmed this to be a problem in the Microsoft products listed above. This problem was corrected in Visual C++ version 1.5. MORE INFORMATION ================ The following sample can be used to demonstrate the problem. Sample Code --- /* Compile options needed: /Oe -or- /Ox */ Line 1 : typedef struct STRUCTURE Line 2 : { Line 3 : char* string1; Line 4 : char* string2; Line 5 : short index; Line 6 : } *PSTRUCTURE; Line 7 : Line 8 : int ch; Line 9 : Line 10 : short test( PSTRUCTURE ptr) Line 11 : { Line 12 : for Line 13 : { Line 14 : if ( ch == '/' ) Line 15 : { Line 16 : ptr->index = 2; // warining: C4713 Line 17 : ptr->string2 = ptr->string1; Line 18 : return 0; Line 19 : } Line 20 : Line 21 : if (ch == '\\' ) Line 22 : { Line 23 : ch = *ptr->string1; Line 24 : continue; Line 25 : } Line 26 : } Line 30 : } Additional reference words: 1.00 8.00 KBCategory: kbtool kbfixlist kbbuglist KBSubcategory: CLIss

Keywords : kb16bitonly kbCompiler

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Technology : kbVCsearch kbAudDeveloper kbCVCComp