FreeTDS Development Group

["ZIGLIO, Frediano, VF-IT" <Frediano.Ziglio AT vodafone.com>]

> >
> > Let's remember a bit of story. Mac OS X had some problem 
> with library
> > for some months we tried to fix it (trying changing libtool 
> script with
> > patch or even libtool version). The main problem is that there were 
> > very
> > few tester... If we change a line and we have to wait for a 
> week or two
> > this means that changing a line ten times require 2 months...
> > After some time someone reported problems with ODBC (driver not 
> > loaded).
> > Someone else report a link to Apple pages that tell that iODBC
> > implementation had problems... After some months we discovered that
> > using bundle instead of .dylib fix the issue. So we add -module to
> > Makefile.am and we had no more reports (happily). Some time ago we
> > discovered also that instead of upgrading libtool we could 
> change link
> > script (and so we did... happily no reports).
> 
> I understand your frustration here.  I myself was never able 
> to get the 
> libraries to build on darwin until Mark Lilback posted his build 
> instructions.  The standard *nix build tools have come a long 
> way since 
> then in terms of darwin support.  In 2005, it looks like most public 
> projects include correct support for darwin in their build 
> scripts.  It 
> was a very different situation in 2003.
> 

I still don't understand the relationship between darwin and Mac OS X.
Darwin it's the core of Mac OS X. However which darwin version use, for
instance, Mac OS X 10.1 ??

> > Your mail, if I remember
> > correctly, was in 0.62 RC phase so instead of trying to 
> improve linking
> > we "ignore" (not correct term...) your mail. Now we are 
> still in RC and
> > still this issue raise in a very bad period.
> 
> I apologize for not being more persistent about getting the changes 
> implemented once 0.62 was released.  I'm just one user and I 
> didn't see 
> anyone else voice an opinion.  Since I wasn't able to make 
> the changes 
> myself, I just let it go.  In hind sight, I should have forced the 
> issue.
> 
> > As you say current scripts
> > work so for 0.63 they are fine.
> >
> > You spot however two problems:
> > 1) two level namespaces
> > 2) module format
> 
> If you're building a dylib, you should definitely build with 
> two level 
> namespaces for darwin 5.0 or later (versions earlier than 5.0 
> must use 
> flat namespaces).  However, I think the real question is which type 
> should be built - dylibs or bundles.
> 
> Dylibs seem to be the preferred library format for darwin in 
> general.  
> There are cases when a bundle might be a better choice.  I think a 
> truly darwin friendly environment would support building 
> both, much in 
> the same way that both iODBC and unixODBC are supported.
> 
> > 1) Probably the solution is to check is Mac OS X (which 
> version provide
> > this option?)? and add -Wl,-twolevel_namespace to 
> src/odbc/Makefile.am
> 
> darwin 5.0 or later:  two level namespace
> else:  flat namespace
> 
> > 2) still problem is version. Which version support correctly
> > loading .dylib??
> 
> I believe all versions of darwin support loading dylibs.  However, 
> Apple only started including the iODBC driver manager libraries 
> starting in darwin 6.
> 
> > All code I sent was from libtool output so another problem is: how
> > libtool behave using -Wl,-twolevel_namespace and not using -module 
> > under
> > Mac OS X ??
> 
> I don't understand libtool at all, so I don't really understand your 
> question.  However, if you give me some things to test, I 
> will try them 
> on various environments and report the results back to you.
> 
> Jonathan
> 

well... libtool it's a script we use to support dynamic library on
multiple platform. It give you a uniform way to build libraries. libtool
is bundled in FreeTDS distro (after executing configure you will note a
libtool script, do not confuse this libtool with Mac OS X one...).
libtool do this hard job very well so at this time we have to live with.
If you want to try to produce a .dylib with current snapshot using two
level namespace simply do this:
- execute configure
- in src/odbc/Makefile
 - find "-module"
 - remove "-module"
 - add "-Wl,-twolevel_namespace"
- make as usual
The library compiled load successfully? Are you able to do a connection?

freddy77