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Date: Fri, 26 May 2000 12:32:45 -0400
Message-Id: <200005261632.MAA24358@envy.delorie.com>
From: DJ Delorie <dj AT delorie DOT com>
To: cookj AT cs DOT man DOT ac DOT uk
CC: cygwin AT sourceware DOT cygnus DOT com
In-reply-to: <200005261245.NAA66045@ceratops> (message from Jon Cook on Fri,
	26 May 2000 13:45:51 +0100 (BST))
Subject: Re: ld -shared
References:  <200005261245 DOT NAA66045 AT ceratops>


> Is the -shared option to ld supported?. 

Yes, but it creates DLLs not shared libraries.

> ld -shared a.o -o liba.so
> 
> But when I try this on cygwin I get an unresolved reference to b -
> exactly as if the shared option is ignored.

You have to link against an import library that defines where b comes
from.  DLLs work differently than shared libraries.  You'll end up with
something like this:

  ld -shared a.o libb.a -o a.dll

where libb.a is the import library for, say, b.dll

Try "ld --help" for a full list of options; the DLL-specific ones are
at the end.  --out-implib and --export-all-symbols will probably be
useful to you.

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