Re: Crash on loading image

[Jason Rumney]

address@hidden (Pavel Janík) writes:

>    > Can we ask the author of libungif to release a new version with the
>    > version number incremented, so it can be detected by configure scripts?
> 
> I can do it, but what will we do when we detect old libungif when
> compile-time? It can be different to the libungif version at run-time. We
> should be able to check for libungif version at run-time.

If we detect the old version of libungif at compile-time, we do not
link to it.  If the library is later upgraded, Emacs will need to be
reconfigured and recompiled to use it.  This is standard for programs
that link with optional libraries, but require specific versions.
Detecting at run-time might be more elegant, but I'm not sure if it
would be worth the extra effort.

Since libraries generally only get upgraded not downgraded, the only
potential problem with compile time checking is a pre-compiled binary
that was compiled with the new libungif, but installed on a system
with the old libungif.  But most binary distributions use packaging
tools that can at least warn the user of such dependencies, so this is
not such a big problem.


-- 
Jason Rumney