Microsoft KB Archive/123780

= BUG: Link Fails w/ Unresolved External When Call SWAP.H =

Article ID: 123780

Article Last Modified on 2/11/2002

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APPLIES TO


 * Microsoft Visual C++ 4.0 Cross Development Edition for Macintosh

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This article was previously published under Q123780



SYMPTOMS
When calling the functions defined in SWAP.H from a C++ program, the link fails with an unresolved external, such as this one:

  TEST.OBJ : error LNK2001: unresolved external symbol "?CbFreeSwapMem@@YCJJ@Z (long __pascal CbFreeSwapMem(long))" TEST.OBJ : error LNK2001: unresolved external symbol "?SetMaxSwapSize@@YAXK@Z (void __cdecl SetMaxSwapSize(unsigned long))" MacDebug/TEST.exe : error LNK1120: 2 unresolved externals



CAUSE
The header file (SWAP.H) in the MSVC20\M68K\INCLUDE directory is missing the necessary extern "C" block around the swap function declarations.



RESOLUTION
Surround the include of SWAP.H with an extern "C" block, as in this example: extern "C" {  #include    }



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.



Sample Code
test.cpp #include   void testFunc(void) {     CbFreeSwapMem(2048); SetMaxSwapSize(4096); }

Additional query words: buglist2.00

Keywords: kbbug kblangcpp KB123780

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