# SANE 1.0.2 linking problems

From: Benjamin Low (ben@snrc.uow.edu.au)
Date: Tue Jun 27 2000 - 20:20:41 PDT

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  I've hit a snag running SANE 1.0.2 - I get indefined symbols when the
  backends are loaded.

  I've a Debian 2.1, linux 2.2.16 machine (w/ 2.4.0 USB backport), driving
  an Epson 610 (USB) scanner. I am using Karl Heinz's
  sane_epson_20000613.tar.gz backend in place of the 1.0.2 version. Karl
  has been of great help in getting the USB side happening, though I
  believe my current problem is sane-specfic (it happens for all backends,
  incl. pnm).

  Configure (with no options), make and make install succeeds (no errors,
  though I do get a bunch of warnings in most of the 'backend' drivers
  (unused variables and the like, nothing obviously serious)).

  $ cat /usr/local/etc/sane.d/dll.conf
  net
  epson
  pnm

  $ ls -l /usr/local/lib/sane/libsane.so.1
  lrwxrwxrwx 1 root staff 20 Jun 28 09:21 libsane.so.1 ->
  libsane-pnm.so.1.0.2*

  $ scanimage -L
  $
  i.e. nothing, not even the pnm test device

  $ SANE_DEBUG_DLL=128 scanimage -L
  [sanei_init_debug]: Setting debug level of dll to 128.
  [dll] adding backend net
  [dll] adding backend epson
  [dll] adding backend pnm
  [dll] loading backend pnm
  [dll] dlopen()ing `/usr/local/lib/sane/libsane-pnm.so.1'
  [dll] dlopen() failed (/usr/local/lib/sane/libsane-pnm.so.1: undefined
  symbol: sanei_debug_pnm)
  [dll] loading backend epson
  [dll] dlopen()ing `/usr/local/lib/sane/libsane-epson.so.1'
  [dll] dlopen() failed (/usr/local/lib/sane/libsane-epson.so.1: undefined
  symbol: sanei_scsi_max_request_size)
  [dll] loading backend net
  [dll] dlopen()ing `/usr/local/lib/sane/libsane-net.so.1'
  [dll] dlopen() failed (/usr/local/lib/sane/libsane-net.so.1: undefined
  symbol: sanei_w_start_reply)
  [dll] exiting
  [dll] calling backend `pnm's exit function
  [dll] call to unsupported backend operation
  [dll] calling backend `epson's exit function
  [dll] call to unsupported backend operation
  [dll] calling backend `net's exit function
  [dll] call to unsupported backend operation

  For what it's worth, I've tried configure --disable-shared with little
  change (the backends still fail to initialise - I can provide more info
  if reqd).

  Looking at the undefined symbols from above, in /usr/local/lib/sane:
  $ nm libsane-pnm.so.1 | grep sanei_debug_pnm
  00004298 B sanei_debug_pnm

  $ nm libsane-epson.so.1 | grep sanei_scsi_max_request_size
  000125d4 D sanei_scsi_max_request_size

  $ nm libsane-net.so.1 | grep sanei_w_start_reply
  00003f60 T sanei_w_start_reply

  As far I as I understand how dlls work (which is not much), this means
  the symbols *are* present, yes?

  I'm more than happy to provide further info as required,

  Regards,

  Ben Low

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  - Next message: Petter Reinholdtsen: "Re: Backends using Kernel-Modules"
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