multiply defined

[pyzaist]

Hello. I created a few include files that have a few functions, constants, and type definitions in each. I'm using it in a project that has multiple files, and they are included in all of them. It throws a lot of errors:

Building ray tracer.exe.
POLINK: error: Symbol '_initSDL' is multiply defined: 'event.obj' and 'load.obj'.
POLINK: error: Symbol '_setpix' is multiply defined: 'event.obj' and 'load.obj'.
... like 30 more
POLINK: error: Symbol '_font_writei' is multiply defined: 'event.obj' and 'trace.obj'.
POLINK: error: Symbol '_font_writef' is multiply defined: 'event.obj' and 'trace.obj'.
*** Error code: 1 ***
Done.

I know the problem is that the functions are defined like five times. Is there any way to fix this besides seperating the functions and definitions in every include file?

[CommonTater]

Two suggestions...  
1) Create a Global header with all the stuff that has to be in every page in it.  I typically do this with windows and library includes.

2) Use guard code in your headers....

Code Select Expand


// MyInclude.h
#ifndef MYINCLUDE_H
#define MYINCLUDE_H


// put your stuff here


#endif // MYINCLUDE_H


Since your defines are now wrapped in a conditional statement that relies upon MYINCLUDE_H not being defined, each header will now only be read once by the pre-processor.  Of course you would use a unique name, generally the header file name in each one.

Hope that helps...