Confusing behaviour from gcc and ld with --as-needed

[Daniel Jacobowitz]

On Mon, Apr 04, 2005 at 07:29:01PM +0100, Mike Hearn wrote:
> Hi,
> 
> [mike@littlegreen libexec]$ gcc -o vfolder-magic vfolder-magic.c -Wl,--as-needed `xml-config --cflags --libs`
> [mike@littlegreen libexec]$ needed vfolder-magic
>   NEEDED      libxml.so.1
>   NEEDED      libc.so.6
> [mike@littlegreen libexec]$ gcc -o vfolder-magic -Wl,--as-needed `xml-config --cflags --libs` vfolder-magic.c
> [mike@littlegreen libexec]$ needed vfolder-magic
>   NEEDED      libc.so.6
> 
> 
> The only difference between the two GCC invocations is the position 
> of the source file on the command line. Yet, the output is different.
> 
> I'm sure there is some good reason for this, but I can't see what it 
> might be. Is there some behaviour of GCC or GNU ld that I have 
> overlooked here?

Try adding -v to those command lines to see what's going on?

-- 
Daniel Jacobowitz
CodeSourcery, LLC