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executor_2k2

Include guards

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My compile spits out the following error messages when in build my project: --------------------Configuration: GameDevelopment - Win32 Debug-------------------- Compiling... bubbles.cpp Linking... TGALoader.obj : error LNK2005: "unsigned char * cTGAcompare" (?cTGAcompare@@3PAEA) already defined in bubbles.obj TGALoader.obj : error LNK2005: "unsigned char * uTGAcompare" (?uTGAcompare@@3PAEA) already defined in bubbles.obj TGALoader.obj : error LNK2005: "struct TGA tga" (?tga@@3UTGA@@A) already defined in bubbles.obj TGALoader.obj : error LNK2005: "struct TGAHeader tgaheader" (?tgaheader@@3UTGAHeader@@A) already defined in bubbles.obj Debug/GameDevelopment.exe : fatal error LNK1169: one or more multiply defined symbols found Error executing link.exe. Creating browse info file... GameDevelopment.exe - 5 error(s), 0 warning(s) I have used include guards on all my headers, so i dont see what the problem is. Any ideas? Edited by - executor_2k2 on January 28, 2002 12:35:56 AM

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The keyword ''extern'' tells the compiler that the variable exists but is defned somewhere else (i.e. has external linkage). Thus you put ''extern unsigned char * cTGAcompare'' in a header file as a declaration, and stick ''unsigned char * cTGA compare'' in ONE of the appropriate source file as a definition.

''tis the same as with class statics.

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