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guile-dbi: Use libltdl and prefer GUILE_DBD_PATH.


From: 宋文武
Subject: guile-dbi: Use libltdl and prefer GUILE_DBD_PATH.
Date: Fri, 16 Sep 2016 11:36:46 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)

Hi!

To reall, curentlly, guile-dbi use dlopen to load its backends.
So, for Guix we have to set LD_LIBRARY_PATH, which is not desired.

> [...]
> (me:)
>> I think it will be great to introduce a new search path (eg: GUILE_DBD_PATH)
>> in addition to LD_LIBRARY_PATH.  Find the absolute so filepath in it
>> ourself, then pass to dlopen.  
>
> (ludo:)
> Why not, but then it would be redundant with LD_LIBRARY_PATH and
> LTDL_LIBRARY_PATH, which would further complicate the search rules.
>

Yeah, but I just learn that libltdl has a convenient function to do
this..


So, here are patches for using libltdl and a new search path:

Attachment: 0001-Use-libltdl-to-dlopen-backends.patch
Description: Text Data

Attachment: 0002-Prefer-GUILE_DBD_PATH-as-search-path-for-backends.patch
Description: Text Data

Attachment: 0003-Update-documentation-for-the-usage-of-libltdl.patch
Description: Text Data

Hope they are obvious :-)

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