How do I make an extern function?

[torhu]

On 29.06.2010 02:51, Simen kjaeraas wrote:
> ////////////////////
> module a;
>
> extern void foo( );
>
> void bar( ) {
>       foo( );
> }
> ////////////////////
> module b;
>
> import std.stdio;
>
> void foo( ) {
>       writeln( "Hi!" );
> }
> ////////////////////
>
> The above does not work (Error 42: Symbol Undefined _D1a3fooFZv). Adding
> extern to foo in module b changes nothing. extern( C ) works, but seems
> like a hack. Better ideas?

Using extern (C) is the only way I've seen this done.  I don't know of 
any way to make the symbols match up otherwise.  There's probably some 
hack that works, but is uglier than the more straightforward solutions. 
  You could always create a b.di file, if that doesn't defeat the purpose.