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Message-ID: <3C0BB578.7060207@ece.gatech.edu>
Date: Mon, 03 Dec 2001 12:25:12 -0500
From: Charles Wilson <cwilson AT ece DOT gatech DOT edu>
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To: "Tikka, Sami" <Sami DOT Tikka AT F-Secure DOT com>
CC: cygwin AT cygwin DOT com
Subject: Re: OpenLDAP + gdbm?
References: <30B026EA81B98D4082E2FD73B14CB812200881 AT fsfimail1 DOT FI DOT F-Secure DOT com>
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Tikka, Sami wrote:

> I'm trying to compile OpenLDAP with LDBM support for libgdbm. I have the
> latest Cygwin. I did:
> 
> LIBS=-lregex ./configure
> make depend
> make
> 
> Everything goes just fine until:
> 
> gcc -g -O2 -I../../include -I../../include
> -L/home/Administrator/src/openldap-2.
> 0.18/libraries -o slapd main.o daemon.o connection.o search.o filter.o add.o
> cha
> rray.o attr.o entry.o config.o backend.o result.o operation.o dn.o compare.o
> mod
> ify.o delete.o modrdn.o ch_malloc.o value.o ava.o bind.o unbind.o abandon.o
> filt
> erentry.o phonetic.o acl.o str2filter.o aclparse.o init.o user.o repl.o
> lock.o c
> ontrols.o extended.o kerberos.o passwd.o schema.o schema_check.o
> schema_init.o s
> chema_prep.o schemaparse.o ad.o at.o mr.o syntax.o oc.o configinfo.o
> starttls.o
> index.o sets.o root_dse.o sasl.o module.o suffixalias.o mods.o version.o
> libback
> ends.a -lavl -lldbm -lldif -llutil -lldap_r -llber -lgdbm -lssl -lcrypto
> -lcrypt
>  -lregex
> Warning: resolving _gdbm_errno by linking to __imp__gdbm_errno (auto-import)
> nmth000000.o(.idata$4+0x0): undefined reference to `_nm__gdbm_errno'
> collect2: ld returned 1 exit status
> 
> What's wrong? 
> $ nm /usr/lib/libgdbm.a|grep gdbm_errno
>          U _gdbm_errno
>          U _gdbm_errno
>          U _gdbm_errno
>          U _gdbm_errno
>          U _gdbm_errno
>          U _gdbm_errno
>          U _gdbm_errno
>          U _gdbm_errno
>          U _gdbm_errno
>          U _gdbm_errno
> 00000010 D _gdbm_errno
> 
> So, gdbm_errno does exist, in the data segment. What am I doing wrong?
> 
> 

You are trying to access the "gdbm_errno" variable from the gdbm 
library.  However, cyggdbm.dll does not export that variable -- because 
it is private and you're not supposed to access it directly from client 
code (Bad OpenLDAP.  No cookie.)

Since the linker can't find gdbm_errno in the importlib for gdbm 
(because the import lib only contains those symbols that are properly 
exported by the dll), the linker tries to do the 'auto-import' thing.

But, the current gdbm package was built long before auto-import support 
was added to ld, so cyggdbm.dll doesn't contain any of the auto-import 
thunks (_nm_*).  So that fails, too.

Solution: fix OpenLDAP to call the gdbm error reporting *function* and 
NOT to access the gdbm_error *variable* directly.

--Chuck


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