Bug#860739: libghc-xcb-types-dev: cannot parse xcb-proto 1.12

[James Cowgill]

Hi,

On Wed, 19 Apr 2017 16:05:12 +0100 James Cowgill <jcowgill at debian.org> wrote:
> Package: libghc-xcb-types-dev
> Version: 0.7.1-4
> Severity: grave
> Tags: sid stretch
> Control: block 839314 by -1
> 
> Hi,
> 
> Currently haskell-xcb-types cannot parse xcb-proto 1.12. While strictly
> speaking you don't have to use this package to just parse the files from
> xcb-proto, it is the package's main purpose and (afaik) only use in the
> archive.

On closer inspection, it looks like haskell-xcb-types has never been
able to parse the full xcb-proto. It's only ever been able to parse the
bits that xcffib needs to work properly. Since adding the extra support
is a lot of work and no packages will use it, I suggest that only the
xcffib stuff is fixed and then this bug can be cloned as important to
cover the other bits.

[...]
> This is the cause of the xcffib FTBFS in #839314
> 
> Apparently xcb-types 0.8.0 fixes this. I don't know how suitable that is
> to be included into stretch.

Upgrading to 0.8.0 breaks the API by adding alignment fields everywhere
to handle the parsing of the new "required_start_align" element. This
means we would also need to backport the relevant xcffib patches as
well. I think this is the best option though.

Relevant xcb-types commits:
https://github.com/aslatter/xcb-types/commit/0991f1d61b92371e9af51ab0fa3699d7c32e2b65
https://github.com/aslatter/xcb-types/commit/a86e578f0860670f3d43fa2d414e93a60aa72e2d

Commit which would need backporting to xcffib:
https://github.com/tych0/xcffib/commit/6e6646b7d5eec253225579e1cbb40acf380648b4

(xcffib would then need to depend on xcb-types >= 0.8)

I notice the xcffib patches ignore the new alignment fields so we might
be able to bodge it by ignoring the "required_start_align" elements in
xcb-types, but since that's a bit of a hack, there are no other rdeps
of xcb-types, and we're going to have to patch both packages anyway, I
don't know if it's worth it.

James

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