[LLVMbugs] [Bug 1494] NEW: Linking fails when using "static const double" field

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1494

           Summary: Linking fails when using "static const double" field
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: maarten at treewalker.org


When compiling the following program:

===
template <unsigned N>
class C {
public:
	static const double INVERSE = 1.0 / N;
};

double getInverse()
{
	return C<14>::INVERSE;
}

int main(int argc, char** argv) {
	return 0;
}

// Without this, linking fails on INVERSE.
//template class C<14>;
===

With the command line:

$ llvm-g++ -o inverse inverse.cc

I get this error message:

/tmp/cc4LClWF.o: In function `getInverse()':
(.text+0xd): undefined reference to `C<14u>::INVERSE'
collect2: ld returned 1 exit status

This error goes away when forcing template instantiation by enabling the 
commented out line at the end.

In the non-LLVM GCC this compiles and links just fine. However, when compiling 
with "-pedantic" it tells you:

inverse.cc:4: error: ISO C++ forbids initialization of member 
constant ‘INVERSE’ of non-integral type ‘const double’

So according to the current spec this entire construct is not allowed. But it 
would be practical to be compatible with GCC's behaviour, to make more 
existing code compile to LLVM.

I'm using LLVM 2.0 and its g++ front-end, compiled from source with GCC 4.1.3.



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