static const member variable link error.

[chortic]

Hello.

I'm trying to compile some code that is giving me an unresolved external symbol link error.

I have a static const float fDeg2Rad in class Math that I declare in the header and define in the source. The only place it is used at the moment is in a static inline function also in Math. If I remove the constant from the inline function the link error does not come up.

//math.h

typedef float Real;

namespace Eris
{
	class __declspec( dllexport ) Math 
	{
	public:
		static inline Real DegreesToRadians(Real degrees) 
			{ return degrees * fDeg2Rad; }

		static const Real PI;
		static const Real fDeg2Rad;
	};
}

//math.cpp

#include "ErisMath.h"
#include "ErisVector3.h"

namespace Eris
{
	const Real Math::PI = Real( 4.0 * atan( 1.0 ) );
	const Real Math::fDeg2Rad = PI / Real(180.0);
}

This is basically copied and pasted from the Ogre3D source code (http://www.ogre3d.org/), and while the Ogre3D code compiles fine, mine throws an unresolved external symbol for fDeg2Rad.

Edit: this is compiled as a dynamic link library on MSVS 2008, which is the reason for the __declspec( dllexport )