[Development] Setting a Minimum Support OpenSSL Version

Shane Kearns shane.kearns.qt at gmail.com
Thu Aug 1 15:13:31 CEST 2013

I agree with this.

There are binary incompatibilities between 0.9 and 1.x, and we haven't
found all of them. Before 1.0, openSSL didn't clearly separate internal
data structures from its API. As a result the existing Qt openssl codebase
is using some internal data structures which causes subtle errors when
using a different openssl version to what it was compiled against.

(of course, we should fix these issues wherever possible by using the
public API of openSSL)

Unfortunately it's usually our users that are finding these problems when
using the windows binary packages.

Linux users are rarely affected, as they more often use source builds or
distro provided binaries that are compiled against the distro provided
openssl packages.

If there are no objections, lets update the documentation and make sure the
binary packages for the next release are using it.

On 31 July 2013 11:26, Peter Hartmann <phartmann at blackberry.com> wrote:

> On 04/16/2013 01:19 PM, Richard Moore wrote:
> > 2) We could say 1.0.0 is the minimum.
> *bump* So is everybody fine with this? Also, does somebody from the
> release team know whether Windows / Linux packages are built with
> version 1.0.*?
> If yes, we could go ahead and change e.g.
> http://qt-project.org/doc/qt-4.8/requirements.html or
> http://qt-project.org/doc/qt-4.8/supported-platforms.html, saying
> OpenSSL 1.* is officially supported, and patches for 0.9.8* are accepted
> or so.
> I think we should not hold on to 0.9.* forever though, because when
> version 1.1.0 comes along (no idea when that will be) we will have to
> deal with binary compatibility breakages again, and handling 3 different
> interfaces will be quite a bit of work.
> Peter
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