[Dev-C++] linking problem

[Horst R. <hr...@un...>]

Hello and moin moin,

I have a seriously problem. The following code produced a linker error and 
no code is build. 

c:\dev\dev-c++\testproj\arrh.o(.bss+0x0)://c/dev/dev-c++/testproj/arrh.cpp: 
multiple definition of `arh'
c:\dev\dev-c++\testproj\main.o(.bss+0x0)://c/dev/dev-c++/testproj/main.cpp: 
first defined here 

If i commented out the include, all is compiled fine. I does not understand 
it. Can anyone help me ? Thanks in advance. 

File:arrh.h 

#ifndef arrh_H
#define arrh_H 

[...] 

class arrhenius
{
 public:
 arrhenius();
 [...]
 bool calc();
} arh; 


File: main.cpp 

#include <cstdlib>
#ifndef arrh_H
#include "arrh.h"
#endif 

int main(int argc, char *argv[])
{
[...]
 bool b = arh.calc();
 [...]} 

#endif 


There are two other questions.
Last day I have integrated a win api referenz as winhelp into dev-c++. After 
copy it in the help directory, it was automaticly integrated. Great !!
Now I seek such for C/C++ commands, a language reference. Any tip ?
Where can I find a list of changes between gcc 2.9.5.2 and gcc 2.9.5.3 ?
I could not find anything. 

greetings
Horst