extern keyword and dlls
Václav Haisman
v.haisman@sh.cvut.cz
Mon Feb 11 10:39:00 GMT 2008
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'
>
> And this is how I call gcc: "gcc -shared hello.c"
>
> Interestingly, the code above does work on my ubuntu installation (ubuntu 7.10 gcc 4.1.3)
>
> Any help is appreciated
>
> Regards
> Fernando
--
VH
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