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Re: (ITS#5945) --enable-backends=auto support

quanah@OpenLDAP.org wrote:
> Full_Name: Quanah Gibson-Mount
> Version: 2.4.13
> OS: NA
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (
> It would be handy to allow --enable-backends to have auto support so that all
> available backends can be selected.  The current behavior is "yes", which means
> that if you don't have the requisites for a given backend, configure stops.

Accommodating this request would make other things much more inconvenient.

Currently the backends and overlay options toggle between "no | yes | mod" 
where "yes" means "yes+static" and "mod" means "yes+dynamic". An "auto" option 
here doesn't allow you to select static vs dynamic. Adding "auto" would revert 
us back to OpenLDAP 2.0's behavior, where every backend required two enable 
switches "--enable-bdb" and "--enable-bdb-mod=static" (or dynamic) which IMO 
was far too cumbersome.

Likewise it would require rewriting most of the backends' detection tests in 
configure.in, which currently use AC_MSG_ERROR when a prereq isn't found. All 
of those would have to be turned into warnings/bailouts in the "auto" case, 
instead of aborting the configure run.

IMO, seems like more effort than it's worth.
   -- Howard Chu
   CTO, Symas Corp.           http://www.symas.com
   Director, Highland Sun     http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP  http://www.openldap.org/project/