[Buildroot] What is the preferred way install additional cmake modules?

[Yann E. MORIN <yann.morin.1998@free.fr>]

Zoltan, All,

On 2015-10-20 18:52 +0200, Zoltan Gyarmati spake thusly:
> i am about to add the modemmanager-qt[1] package to Buildroot, which
> for building depends on a set of additional cmake modules also
> provided by the KDE project, called extra-cmake-modules[2], which
> itself also uses cmake for building and installing.
[--SNIP--]
>  My instinct would say that extra-cmake-modules is supposed to be a
> host package

My instinct says so, too. ;-)

> (as then i wouldn't need to explicitly set
> EXTRA_CMAKE_MODULES_INSTALL_TARGET to NO), so i tried this to define
> as a host-cmake-package, make modemmanager-qt depending on
> host-extra-cmake-modules, but then the cmake modules not found by the
> modemmanager-qt build config.

So:
  - if extra-cmake-modules are in staging/ then it works
  - if extra-cmake-modules are in host/ then it does not work

But what is not found? The ECM files themselves? Can you paste the few
lines that exhibit the error, please?

> In this latter case the .cmake files gets installed under:
> path-to-buildroot/output/host/usr/share/ECM/cmake/

I would have indeed expected to see them installed there.

> What is the preferred way to install this package? Install it as a
> host-package, and specify a custom install target dir, or leave it as
> plain cmake-package?

My stance:
  - it is a host-package

We need to understand why cmake can't find those modules.

I CCed Samuel, our cmake expert, so he can shine some light on this.

Regards,
Yann E. MORIN.

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