[sane-devel] How to Install and Customize SANE Ubuntu 18.04

[Ralph Little]

Hi,

On Wed, May 25, 2022 at 2:36 PM Wes Rishel <wrishel at gmail.com> wrote:

> Thanks. This all worked now and I am a bit puzzled about testing.
>  It is a little difficult to know whether I am testing my temporary
> version or the system version. The which command makes it look like the
> system version will run and there is no change in the version number. Does
> the which command not work when LD_LIBRARY_PATH is set?
>
> tevs at tevs-SEi:~/HETP/sane_install_220525c/backends$ env | grep LD_
> LD_LIBRARY_PATH=/home/tevs/HETP/sane_install_220525c_output/lib/sane
> tevs at tevs-SEi:~/HETP/sane_install_220525c/backends$
>
>
>
>
>
>
> * ls -l /home/tevs/HETP/sane_install_220525c_output/bin total
> 1096-rwxr-xr-x 1 tevs tevs  20144 May 25 14:20 gamma4scanimage-rwxr-xr-x 1
> tevs tevs   2723 May 25 14:20 sane-config-rwxr-xr-x 1 tevs tevs 359528 May
> 25 14:20 sane-find-scanner-rwxr-xr-x 1 tevs tevs 213416 May 25 14:20
> scanimage-rwxr-xr-x 1 tevs tevs 519648 May 25 14:20 umax_pptevs at tevs-SEi:*~/HETP/sane_install_220525c/backends$
> which scanimage
> /usr/local/bin/scanimage
> tevs at tevs-SEi:
>
> That's a good question. LD_LIBRARY_PATH influences the choice for the
loading of shared objects.
If you want to be sure about what is being loaded, you can use the
SANE_DEBUG_DLL debug variable in your terminal where you have
LD_LIBRARY_PATH set:

SANE_DEBUG_DLL=3 scanimage -L 2>&1 |  grep fujitsu

Hopefully, the path that you see being dlopen'ed is pointing to the backend
that you built.

For me, I see this:

rlittle at rlittlelaptop ~/play/sane/backends $ SANE_DEBUG_DLL=3 scanimage -L
2>&1 |  grep fujitsu
[14:52:12.843615] [dll] add_backend: adding backend `fujitsu'
[14:52:23.587054] [dll] load: searching backend `fujitsu' in
`/home/rlittle/sane-install/lib/sane:/usr/lib/x86_64-linux-gnu/sane:/usr/lib/sane'
[14:52:23.587103] [dll] load: dlopen()ing
`/home/rlittle/sane-install/lib/sane/libsane-fujitsu.so.1'
[14:52:23.587453] [dll] init: initializing backend `fujitsu'
[14:52:29.831289] [dll] sane_exit: calling backend `fujitsu's exit function

Cheers,
Ralph
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