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From "Sander Striker" <stri...@apache.org>
Subject instdso.sh and libtool, WAS: RE: FW: shared dav_svn is not relinking
Date Thu, 18 Apr 2002 17:55:55 GMT
> From: trawick@rdu88-250-035.nc.rr.com
> [mailto:trawick@rdu88-250-035.nc.rr.com]On Behalf Of Jeff Trawick
> Sent: 18 April 2002 19:12

> "Sander Striker" <striker@apache.org> writes:
> 
>>>>> 1) always do libtool --install
>>
>> Can we agree on this?  Since we are using libtool throughout our
>> entire build it seems inconsistent to bypass it here.
> 
> yes, we can agree on this...

Ok, glad to hear that.
 
> I'm planning to work on this tonight and in the morning.  If you'd
> rather proceed yourself, that's fine, and I can test on AIX, Tru64,
> and HP-UX and assume that any oddities on other platforms are
> represented by what happens on those three platforms.

Ok, cool.  I probably don't have time to look at it until this
weekend, so please don't wait for me.  I'll provide some comments
here that will hopefully be helpfull.

>>>>> 2) look in installed .la file for the name that must be passed to
>>>>>    dlopen and rename that file in the target directory to what we
>>>>>    think a DSO ought to be named
>>>> 
>>>> But we only need to do that for AIX, Tru64 and HP-UX.
>>> 
>>> I don't really believe that :)  libtool has as many nuances as there
>>> are operating systems.  It seems easy enough to look in the .la file
>>> and if the name to dlopen is different than what we want, rename what
>>> it got installed as.
>> 
>> Can you give me some examples?  I am totally in the dark here and
>> some input on what happens could possibly enable me to help solve
>> the problem.
> 
> Here is what gets installed for me with libtool 1.4.2 on AIX:
> 
> -rw-r--r--   1 trawick  staff      62568 Apr 18 12:53
>  ../../built/modules/libmod_foo.a
> lrwxrwxrwx   1 trawick  staff         25 Apr 18 12:53
>  ../../built/modules/libmod_foo.so -> libmod_foo.so.0.0.0
> lrwxrwxrwx   1 trawick  staff         25 Apr 18 12:53
>  ../../built/modules/libmod_foo.so.0 ->
>  libmod_foo.so.0.0.0
> -rwxr-xr-x   1 trawick  staff      71968 Apr 18 12:53
>  ../../built/modules/libmod_foo.so.0.0.0
> -rw-r--r--   1 trawick  staff        792 Apr 18 12:53
>  ../../built/modules/mod_foo.la
> 
> These variables in the .la file look interesting:
> 
> # The name that we can dlopen(3).
> dlname='libmod_foo.so.0.0.0'
> # Names of this library.
> library_names='libmod_foo.so.0.0.0 libmod_foo.so.0 libmod_foo.so'

Ah, now I see what you are talking about.  Ok, I think we need to do
the following (all the time*):

 - extract dlname from $MODULE_BASENAME.la
 - extract library_names from $MODULE_BASENAME.la
 - remove $MODULE_BASENAME.la
 - remove all files in library_names, except $dlname
 - rename $dlname to $MODULE_BASENAME.so

And maybe:
 - remove [lib]$MODULE_BASENAME.a
 

Judging from your emails this is kind of what you had in mind, correct?

*) That is, until a patch is submitted to libtool that will give
   us our expected behaviour all the time.
 
>> Also, is this solvable in libtool itself?  IOW, can we come up with
>> a patch to libtool that solves the problem?
> 
> sure, somebody could come up with a patch :)

heh.

>>>>> 3) since this design does libtool --install for every DSO, we need to
>>>>>    work hard to zap the extra system-dependent libtool-created
>>>>>    files/symlinks in the target directory
>>>> 
>>>> But that's not too hard.  We can zap everything not ending with .so,
>>>> right?
>>> 
>>> sounds right...  and you have to account for a possible "lib" prefix
>>> on some of the files
>> 
>> How did the lib prefix get there in the first place?  (does that happen
>> on AIX, Tru64 or HP-UX?).
> 
> libtool decided that the lib prefix was appropriate (and I expect that
> it is correct, given the assumption that the library is for linking
> against) .  
> 
>> If you pass -module to libtool you can name
>> it anything you like; like we do for our modules.
> 
> We're already using -module.  Are we using it incorrectly?

That's odd.  I thought that was one of the reasons to use -module.
If you don't pass it, libtool complains that the name doesn't start with 'lib'.
This sounds like a libtool bug.  You are only seeing the lib prefix appear
on some platforms, correct?

Sander


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