Nasty linker problem; multiply defined

This is a really frustrating error. I've tried everything I can think of and it still doesn't link properly.

Now, I have three headers: aux.h, start.h and dataf.h, and each one is wrapped in inclusion guards. I have two source files: aotrn.cpp and dataf.cpp. Now, dataf.cpp needs to include aux.h and dataf.h, and aotrn.cpp (at the moment) only needs start.h.

I get the following error:

/tmp/ccYdCaoB.o(.text+0x0): In function `KillGame(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
: multiple definition of `KillGame(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
/tmp/ccZuFcvP.o(.text+0x0): first defined here
/tmp/ccYdCaoB.o(.text+0x50): In function `wait_ms(long)':
: multiple definition of `wait_ms(long)'
/tmp/ccZuFcvP.o(.text+0x50): first defined here
/tmp/ccYdCaoB.o(.text+0x80): In function `fcout(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
: multiple definition of `fcout(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
/tmp/ccZuFcvP.o(.text+0x80): first defined here
/tmp/ccYdCaoB.o(.text+0x100): In function `File_Encrypt(char*, char*)':
: multiple definition of `File_Encrypt(char*, char*)'
/tmp/ccZuFcvP.o(.text+0x100): first defined here
/tmp/ccYdCaoB.o(.text+0x210): In function `ForkExecute(char*)':
: multiple definition of `ForkExecute(char*)'
/tmp/ccZuFcvP.o(.text+0x210): first defined here
collect2: ld returned 1 exit status
make: *** [AoTRN] Error 1

I don't want to post the source up as that would mean posting 5 files each more than about 30 lines.

*edit*

Oh yeah, I'm using G++ 3.3.5

You don't have function definitions in header files do you - because that's bad news unless
a) the functions are static
b) the functions are inline
c) the functions are templates

If you mean like this:

Code:

// aux.h

void foo()
{
	// nooooo
}

Then yeah, I have. So I need to declare the functions in the .h files and define them in .cpp files?

> Then yeah, I have. So I need to declare the functions in the .h files and define them in .cpp files?
Yes.

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