Cygwin ld is messing with me?

Cygwin ld is messing with me?

[perlspinr]

Hello,

I won't forbear to mention that I thought about emailing 
Chuck Wilson privately about this because I know (from 
another List recently) that he knows a lot about how ld 
finds / resolves library searches when linking. But I 
feel that wouldn't be fair to Chuck, so even if it's 
going to result in typical cygwin list flames, here 
goes. In public.

I have written a makefile to build GD-2.0.1 on cygwin 
and it's working nicely for me

http://home.att.net/~perlspinr/makefiles/makefileworkshop
.html

-- in a few hours that url will show a link to the 
makefile --

but for one point; once the libGD DLL is built and 
installed in it's final desired location on the system, 
ld cannot find it when it goes to build (final linking 
to create .exes) the applications that Tom Boutell 
includes in GD.

My makefile causes the DLL to be named {cyggd.dll.a} 
which AFAIU is the "right" way, the Cygwin-packagers 
standard way, to name a lib that depends on the 
Cygwin1.dll rt (as opposed to -mno-cygwin stuff).

The lib gets put into /usr/local/lib and of course the 
DLL itself goes into /usr/local/bin (BOY I sure hope 
nobody reading this needs to ask why or challenge it ... 
that would be very OTPF [Off The Purpose For] this 
thread). But ld (as run by master gcc) reports it cannot 
find "-lgd" and dies.

Any ideas, explanations?

   TIA,
    Soren Andersen (perlspinr)

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Re: cygwin ld is messing with me?

[Christopher Faylor]

On Tue, May 28, 2002 at 08:37:26PM +0000, perlspinr@att.net wrote:
>I won't forbear to mention that I thought about emailing Chuck Wilson
>privately about this because I know (from another List recently) that
>he knows a lot about how ld finds / resolves library searches when
>linking.  But I feel that wouldn't be fair to Chuck,

Yeah, and it doesn't scale, and if Chuck is on vacation, you won't
receive an answer for a long time, and it is against the oft-stated
policy on this and many other mailing lists.

>so even if it's going to result in typical cygwin list flames, here
>goes.  In public.

As opposed to a potential one-on-one flame from Chuck for bothering him
personally...

>My makefile causes the DLL to be named {cyggd.dll.a} which AFAIU is the
>"right" way, the Cygwin-packagers standard way, to name a lib that
>depends on the Cygwin1.dll rt (as opposed to -mno-cygwin stuff).

I'm assuming that your DLL is actually called "cyggd.dll", not
"cyggd.dll.a".  From the makefile, that seems to be the case.
"cyggd.dll.a" is the import library.

>The lib gets put into /usr/local/lib and of course the DLL itself goes
>into /usr/local/bin (BOY I sure hope nobody reading this needs to ask
>why or challenge it ...  that would be very OTPF [Off The Purpose For]
>this thread).  But ld (as run by master gcc) reports it cannot find
>"-lgd" and dies.

Changing your link line to:

  gcc -Xl,--verbose ...

should show what the linker is doing.

cgf

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Re: Cygwin ld is messing with me?

[Charles Wilson]

perlspinr@att.net wrote:

> My makefile causes the DLL to be named {cyggd.dll.a} 
> which AFAIU is the "right" way, the Cygwin-packagers 
> standard way, to name a lib that depends on the 
> Cygwin1.dll rt (as opposed to -mno-cygwin stuff).


cyggd.dll    <<< the typical name for the ***DLL***
libgd.dll.a  <<< the typical name for the ***import library***


> 
> The lib gets put into /usr/local/lib and of course the 
> DLL itself goes into /usr/local/bin (BOY I sure hope 
> nobody reading this needs to ask why or challenge it ... 
> that would be very OTPF [Off The Purpose For] this 
> thread). But ld (as run by master gcc) reports it cannot 
> find "-lgd" and dies.


You probably need to include -L/usr/local/lib in your link line.  IIRC, 
ld doesn't search /usr/local/lib by default, only /lib, /usr/lib, and 
the gcc-specific locations (/lib/gcc-lib/something/ ???).

--Chuck


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