Microsoft KB Archive/216716

= FIX: Relocations Not Generated For Array of Ptrs To Functions Using Typedefs =

Article ID: 216716

Article Last Modified on 11/18/2003

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APPLIES TO


 * Microsoft Visual C++ 6.0 Enterprise Edition
 * Microsoft Visual C++ 6.0 Professional Edition
 * Microsoft Visual C++ 6.0 Standard Edition

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This article was previously published under Q216716



SYMPTOMS
Relocations are not generated for typdefed pointers (or arrays) to a typedef of a function pointer. This leads some pointers to incorrect locations.



RESOLUTION
Two levels of typedef's are required to encounter this bug. One workaround is to use only one typedef to alias the pointer to function type.



STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

This bug was corrected in Visual Studio 6.0 Service Pack 3. For more information about Visual Studio service packs, please see the following articles in the Microsoft Knowledge Base:

194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed



Steps to Reproduce Behavior
struct S{   int m_x; int m_y; };
 * 1) include 

S f { return S; }

typedef S (Func_t); typedef Func_t *pFunc_t; typedef int (* PFUNC);

pFunc_t pFunc1 = &f; PFUNC * ppFunc1 = reinterpret_cast( &pFunc1 );

pFunc_t pFunc2 = 0; PFUNC * ppFunc2 = reinterpret_cast( &pFunc2 );

int main {   pFunc_t pFunc3  = &f; PFUNC * ppFunc3 = reinterpret_cast( &pFunc3 );

pFunc_t pFunc4 = 0; PFUNC * ppFunc4 = reinterpret_cast( &pFunc4 );

printf("pFunc1 = 0x%08x\n", pFunc1); printf("ppFunc1 = 0x%08x\n", ppFunc1); printf("pFunc2 = 0x%08x\n", pFunc2); printf("ppFunc2 = 0x%08x\n", ppFunc2); printf("pFunc3 = 0x%08x\n", pFunc3); printf("ppFunc3 = 0x%08x\n", ppFunc3); printf("pFunc4 = 0x%08x\n", pFunc4); printf("ppFunc4 = 0x%08x\n", ppFunc4);

return 0; } The addresses in the following output may vary:

pFunc1 = 0x00401005 ppFunc1 = 0x00401005 pFunc2 = 0x00000000 ppFunc2 = 0x00000000 Shouldn't be 0 pFunc3 = 0x00401005 ppFunc3 = 0x00401005 pFunc4 = 0x00000000 ppFunc4 = 0x00000000 Shouldn't be 0

Keywords: kbbug kbfix kbvc600fix kbcpponly kbcompiler kbvs600sp3fix KB216716

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