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VanKurt

Little linker probs

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Hi there! Today is one of those days when nothing seems to work. For the first time in months I've got some crazy linker errors I can't get rid of (thought those times were through...pretty emberassing). I've created a header file, in which I declare some HLSL extensions:
#ifndef hc_OpenGLExtensions
#define hc_OpenGLExtensions


// Extensions needed for GLSL
PFNGLCREATEPROGRAMOBJECTARBPROC		glCreateProgramObjectARB;
PFNGLDELETEOBJECTARBPROC			glDeleteObjectARB;
PFNGLUSEPROGRAMOBJECTARBPROC			glUseProgramObjectARB;
PFNGLCREATESHADEROBJECTARBPROC		glCreateShaderObjectARB;
PFNGLSHADERSOURCEARBPROC			glShaderSourceARB;
PFNGLCOMPILESHADERARBPROC			glCompileShaderARB;

#endif

This file gets included by all other files in the project. This leads to this list of errors: CEngineCore.obj : error LNK2005: "void (__stdcall* glUseProgramObjectARB)(unsigned int)" (?glUseProgramObjectARB@@3P6GXI@ZA) already defined in CTimer.obj CEngineCore.obj : error LNK2005: "int (__stdcall* glGetAttribLocationARB)(unsigned int,char const *)" (?glGetAttribLocationARB@@3P6GHIPBD@ZA) already defined in CTimer.obj CEngineCore.obj : error LNK2005: "unsigned int (__stdcall* glCreateProgramObjectARB)(void)" (?glCreateProgramObjectARB@@3P6GIXZA) already defined in CTimer.obj CEngineCore.obj : error LNK2005: "void (__stdcall* glActiveTextureARB)(unsigned int)" (?glActiveTextureARB@@3P6GXI@ZA) already defined in CTimer.obj CEngineCore.obj : error LNK2005: "void (__stdcall* glDeleteObjectARB)(unsigned int)" (?glDeleteObjectARB@@3P6GXI@ZA) already defined in CTimer.obj CEngineCore.obj : error LNK2005: "void (__stdcall* glGetInfoLogARB)(unsigned int,int,int *,char *)" (?glGetInfoLogARB@@3P6GXIHPAHPAD@ZA) already defined in CTimer.obj CEngineCore.obj : error LNK2005: "void (__stdcall* glVertexAttribPointerARB)(unsigned int,int,unsigned int,unsigned char,int,void const *)" (?glVertexAttribPointerARB@@3P6GXIHIEHPBX@ZA) already defined in CTimer.obj CEngineCore.obj : error LNK2005: "void (__stdcall* glAttachObjectARB)(unsigned int,unsigned int)" (?glAttachObjectARB@@3P6GXII@ZA) already defined in CTimer.obj CEngineCore.obj : error LNK2005: "void (__stdcall* glEnableVertexAttribArrayARB)(unsigned int)" (?glEnableVertexAttribArrayARB@@3P6GXI@ZA) already defined in CTimer.obj ... ..and so on. There's over 500 of them!!! I'm pretty sure it's a stupid little mistake but I can't figure it out right now :-( Can anyone give me clue? Thank's a lot guys!

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Like all global variables, extension pointers stored in header files should be declared extern, and then you need to define them in one source file.

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