Re: extern keyword and dlls

[Václav Haisman]

masta uy wrote, On 11.2.2008 0:40:

Hello,

I am in working on porting some code to cygwin but I am stuck. I need it to be 
compiled as a dll but gcc gives me a linking error.

This code triggers the error:

extern int num;

int foo() {
  extern int num;
  num = 5;
}

You are missing a definition of num. All you have now is just a declaration.

the error is:

hello.c:(.text+0x5): undefined reference to `_num'


Interestingly, the code above does work on my ubuntu installation (ubuntu 7.10 
gcc 4.1.3)

Any help is appreciated

Regards
Fernando

And this is how I call gcc: "gcc -shared hello.c"

--
VH

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