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Date: Mon, 11 Feb 2008 07:29:14 +0100
From: =?UTF-8?B?VsOhY2xhdiBIYWlzbWFu?= <v DOT haisman AT sh DOT cvut DOT cz>
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To: cygwin AT cygwin DOT com
Subject: Re: extern keyword and dlls
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masta uy wrote, On 11.2.2008 0:40:
> Hello,
>=20
> 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.
>=20
> This code triggers the error:
>=20
> extern int num;
>=20
> int foo() {
>   extern int num;
>   num =3D 5;
> }
You are missing a definition of num. All you have now is just a declaration.

>=20
>=20
> the error is:
>=20
> hello.c:(.text+0x5): undefined reference to `_num'
>=20
> And this is how I call gcc: "gcc -shared hello.c"=20
>=20
> Interestingly, the code above does work on my ubuntu installation (ubuntu=
 7.10 gcc 4.1.3)
>=20
> Any help is appreciated
>=20
> Regards
> Fernando

--
VH


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