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Re: 1.5 release

From: Bob Friesenhahn
Subject: Re: 1.5 release
Date: Sat, 23 Apr 2005 10:13:45 -0500 (CDT)

On Sat, 23 Apr 2005, Ralf Wildenhues wrote:

* Bob Friesenhahn wrote on Sat, Apr 23, 2005 at 04:36:11PM CEST:
On Sat, 23 Apr 2005, Ralf Wildenhues wrote:
+8)  Note that using libltdl in conjunction with direct uses of dlopening
+mechanisms is not supported.  For example, it may work if you use
+libltdl but another library you use uses dlopen() directly, but it is

What inspired the above?  It is normal for there to be multiple users
of dlopen() in one program.  Without it, most programs won't run at
all.  They would not even get off the ground.

Hmm.  "It might not do what you want".  Sure to be mostly corner cases,
but not impossible:  In pseudo code:

Suppose, the module libfoo depends on libbar.
- main calls lt_dlopen("libfoo")
- uses unrelated library libbaz
- libbaz dlopens libbar as well
- main lt_dlclose("libfoo") leads to dlclose(libbar)
- libbaz might still be in use and want to use libbar.

You might argue main should have made libbar resident.
If so, we should mention that in the docs.
Same situation the other way round (lib dlclose()s a module which
libltdl still thinks open).

Ahhh, I see. But this is not at all close to what the original statement implies. The original statement causes FUD, and implies that terrible things may happen if a program depends on a library which choses to use a different module loader than libltdl for its own modules. That is pretty much the same as saying that KDE and Gnome need not apply. :-)

The second sentance is not gramatically correct.

I can see that its grammar is terse, but I (seriously!) cannot spot an
error.  Gotta ask my girl later, she speaks English better than I do.

But how about this instead:

8)  Note that use of libltdl and a native dlopening mechanism for the
same module within one program is not supported.

That is much better and makes the failure scenario much more clear. I like this one.

Bob Friesenhahn
GraphicsMagick Maintainer,

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