Bug#831853: src:llvm-toolchain-snapshot: missing versioned Build-Depends: cmake (>= 3.4.3)

[Helmut Grohne]

On Wed, Jul 20, 2016 at 10:11:11AM +0200, Sylvestre Ledru wrote:
> Le 20/07/2016 à 09:44, Helmut Grohne a écrit :
> > Given that the dependency is relevant to backporters and that 3.9 will
> > eventually transition to a stable release, I think that simply adding
> > the version constraint is the best route forward.
> I understand you concern but I have a different issue.
> I am using the same debian repo for http://apt.llvm.org/
> As I am supporting old Ubuntu distro, your patch is going to break the
> dependencies as cmake is not available.
> (I am using an upstream cmake tarball).
> 
> Would you have a workaround which could fix that?

Given the contradictory requirements I don't see a good way. The only
way to upload the same d/control for both precise and sid seems to be
some kind of conditional. Those conditionals are commonly called "build
profiles", but I fear that precise doesn't support build profiles.

The cleanest approach seems to be to actually ship different d/control
for precise and sid. That boils down to have a d/rules target for
generating d/control though and adds more load.

Given that I didn't know your requirements, maybe this bug is not worth
fixing until precise is recycled, which seems to be April 2017.

Helmut