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Old 01-29-2003, 10:22 AM   #1
schatoor
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linking problem: "multiple definition of .."


Hi,
I have some problems linking a program that I created. I get these errors:

/tmp/cciJGmJZ.o(.data+0x0): multiple definition of `operators'
/tmp/ccAQ8C4f.o(.data+0x0): first defined here
/tmp/cciJGmJZ.o(.data+0x8): multiple definition of `fNames'
/tmp/ccAQ8C4f.o(.data+0x8): first defined here
/tmp/cciJGmJZ.o(.data+0x1c): multiple definition of `countFunctions'
/tmp/ccAQ8C4f.o(.data+0x1c): first defined here
/tmp/cciJGmJZ.o(.bss+0x0): multiple definition of `currentExpression'
/tmp/ccAQ8C4f.o(.bss+0x0): first defined here
collect2: ld returned 1 exit status
make: *** [all] Error 1

because the source files are to big to be posted here, I'l just give a link to where they are at;
link
You will find three files, ES.cpp, ES.h and main.h
The thing is, I need the stuff that's in "ES.h" in both "ES.cpp" and "main.cpp". That's why I have an "#include "ES.h" " in both. And I think this results in the error.
Can someone help me?
 
Old 01-29-2003, 10:28 AM   #2
cybercop12us
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you can give -Xlinker -zmuldefs option to g++ if you are using g++

or if you are using ld to link u can give -zmuldefs
 
Old 01-29-2003, 10:37 AM   #3
schatoor
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Hi,
it didn't work. This is my makefile:

#!/bin/bash

all:

g++ ES.cpp main.cpp -Xlinker -zmuldefs -o calc


It still says the same
 
Old 01-29-2003, 11:32 AM   #4
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Make sure that in your .h files, the #ifndef line is the very first thing, so you should remove the comment at the beginning of that file.
 
Old 01-29-2003, 12:14 PM   #5
GtkUser
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And I could be wrong but it might be the case that you have to export the variables defined in other files. It might have something to do with scope rules.

Last edited by GtkUser; 01-29-2003 at 12:17 PM.
 
Old 01-30-2003, 04:40 AM   #6
schatoor
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Hello,
GtkUser, I don't know how to do that. How do yuou export variables?
 
Old 01-30-2003, 05:00 AM   #7
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To tell you the truth, I have not used it for before, but I've read about it. Infact I should have said 'extern' rather than export.

So in your .h file your declaration can be like this:
extern int value;

But not this:
int value = 0;
Or this is wrong too:
int value;

Extern means that value is defined somewhere else in a .cpp file. Also you can not initialize variables in the .h file, because that means they become a definition. Apparently the header file should only contain definitions for INLINE functions or objects. And the rest is declarations. A non-inline definition belongs in the .cpp file. At least that is what I gather.

Last edited by GtkUser; 01-30-2003 at 05:02 AM.
 
Old 01-30-2003, 05:08 AM   #8
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The header file is a centralized location for all extern object declarations, function declarations, and inline function definitions. That's all.

Files that must use or define and object or function include the header file(s).

So in other words, you have variable definitions in your header file, and those should be removed or made extern, or made inline.

Last edited by GtkUser; 01-30-2003 at 05:10 AM.
 
Old 01-30-2003, 05:11 AM   #9
schatoor
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Thanks. I have a friend here sugesting the same thing. So I'l try and report back
 
Old 01-30-2003, 05:21 AM   #10
schatoor
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Thanks a million. It worked.
 
Old 02-02-2010, 02:06 AM   #11
Sanjeev Sawargi
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Smile Thanks

Quote:
Originally Posted by schatoor View Post
Thanks a million. It worked.
It works...
 
Old 05-03-2012, 03:04 AM   #12
lastsurvivor
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Thank you very much
 
  


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