Microsoft KB Archive/85875

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/WX Option Causes Suppression of C4101 & C4102 Warnings

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Q85875

7.00 | 1.00 1.50 1.51 MS-DOS | WINDOWS kbtool -- The information in this article applies to: - The Microsoft C/C++ Compiler (CL.EXE), included with: - Microsoft C/C++ for MS-DOS, versions 7.0 - Microsoft Visual C++ for Windows, versions 1.0, 1.5, and 1.51 -- SUMMARY ======= The /WX switch causes the following two warnings warning C4102: identifier : unreferenced label warning C4101: identifier' : unreferenced local variable to be suppressed after any warning occurs. To see all the warnings, the /WX switch must be omitted. MORE INFORMATION ================ Normally, the compiler continues to generate errors until the end of compilation or until a fatal error occurs. Because the /WX switch causes warnings to be treated as nonfatal errors, one might expect to see all other occurrences of the C4101 and C4102 warnings. This is not the case. NOTE: This behavior does not occur using Visual C++ 32-bit Edition. With the following sample code, if the following command line is used cl /W4 /WX file.c the compiler will only generate the following warnings: warning C4035: 'main' : no return value error C2220: warning treated as error - no object file generated If we omit the /WX compiler option, the compiler generates the following warnings: warning C4035: 'main' : no return value warning C4102: 'Label' : unreferenced label warning C4101: 'b' : unreferenced local variable warning C4101: 'c' : unreferenced local variable Sample Code --- In the sample code below, note that by removing the /WX switch, the compiler issues all the warnings. /* Compile options needed: /W4 /WX */ #include main(void) { int a = 1; int b ; int c ; Label: printf (&quot; a = %d \n&quot;); } Additional reference words: kbinf 1.00 1.50 7.00 8.00 8.00c KBCategory: kbtool KBSubcategory: CLIss

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Technology : kbVCsearch kbAudDeveloper kbCVCComp