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linking: multiple definition

Started by slip Jan 27, 2003 at 5:44 AM 1 replies 400+ views

Original Post

Jan 27, 2003 at 5:44 AM

I''ve got two source files including the same header file, and within the header file I declare some variables, after compiling when ''ld'' tries to link the object files together it complains about the variables being declared twice. What can I do to solve this problem? Is there a special way to declare the variables? Thanks in advance slip

Koen

Jan 27, 2003 at 6:02 AM

The header file is included in both sourcefiles. This means the variable definitions exist twice. Declare you global vars in one and only one sourcefile. If you want to use them in another source (or header file) use the extern keyword like this:

test.cpp:

int aVar=5;//this is the real declaration

someheader.h or someSource.cpp:

extern int aVar;//this means aVar exists somewhere else

[edited by - Koen on January 27, 2003 7:42:47 AM]

slip

Jan 27, 2003 at 6:14 AM

Thanks... I just found the solution from an article here too. =)

slip

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