[STDCXX-613] [MSVC 8.0] static const data members violate the ODR

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: External

Environment

MSVC 7.0, 7.1, and 8.0

• Regression: Regression
• Severity: Linker Error
• Assignee: Unassigned
• Reporter: Martin Sebor
• Created: 24/Oct/07 17:56
• Updated: 24/Oct/07 17:56

Description

Copied from Rogue Wave Bugzilla: http://bugzilla.cvo.roguewave.com/show_bug.cgi?id=1744

The program below illustrates that a definition of each static const integral data member of explicit specializations of class templates that are initialized in the body of the specialization is emitted by MSVC 7.0 in each translation unit that references the member. This is, of course, incorrect and leads to linker
errors.

$ cat t.cpp

template <class T>
struct S;

template <>
struct S<int>
{
static const int i = 0;
};

#ifndef MAIN

const int S<int>::i;

#else

int main ()
{
return S<int>::i;
}

#endif

$ cl -c -Fot.obj t.cpp && cl -c -DMAIN -Fomain.obj t.cpp && cl main.obj t.obj
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 13.00.9344.1 for 80x86
Copyright (C) Microsoft Corporation 1984-2001. All rights reserved.
...
t.obj : error LNK2005: "public: static int const S<int>::i" (?i@?$S@H@@2HB) already defined in main.obj
main.exe : fatal error LNK1169: one or more multiply defined symbols found