[Wayland-bugs] [Bug 97624] protocol: GLES library are wayland protocol dependent

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97624

--- Comment #2 from Vincent Abriou <vincent.abriou at st.com> ---
(In reply to Pekka Paalanen from comment #1)
> Hi,
> 
> I don't think downgrading a library is generally supported on any software
> across minor version number changes.
> 
> Just to get this straight: you built your library against 1.11.0 and
> attempted to run it against 1.9.0, yes?

Yes.

> 
> If you build against a new library version which has bumped the minor
> version number, you cannot usually assume that you can still run it against
> a library version with a smaller minor number.
> 
> The other direction we do try hard to keep things working: build against
> older library and run against a newer library. Only major version bumps can
> break that, and we do not intend to bump major on any libwayland.
> 
> We also try to ensure that having a library built against one libwayland
> version and another library or the executable itself built against a
> different libwayland version also work when loaded into the same process,
> but we do not have the facilities to actually test that.
> 
> So, yes, if you build your software against a libwayland version, then it
> will generally require at least that libwayland version.
> 
> It is also assumed that you use wayland-scanner of the same version as you
> will build your software with.
> 
> If you are checking in files generated with wayland-scanner into your VCS,
> please stop doing that and instead run wayland-scanner as part of the build.
> That way it is much easier to keep your software both up-to-date and
> compatible with several libwayland versions. The scanner can and will use
> new features added in the release it was part of, so simply re-running the
> scanner can bump your dependency to libwayland.
> 

waykand-scanner is used in my building environment to generate client and
server protocol header file that will be use by my libGLES library.

> 
> If you cannot bump your library dependencies, you have to continue building
> against libwayland 1.9.0.

The fact is that wayland-scanner has been updated between 1.9.0 and 1.11.0 and
I understand that it force me to align my libGLES according to libwayland I am
using.

Thanks for your reply.

Br
Vincent

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