[CMake] Installing a list of components

[Klaim - Joël Lamotte]

On 18 August 2016 at 17:26, <tom.edwards at thefoundry.co.uk> wrote:

> I’m working on an application which consists of many different components
> surrounding a common core. We ship multiple products from the same source
> tree by adding and/or removing components from the output application
> directory.
>
>
>
> Using CMake’s install system in this environment is proving difficult.
> I’ve managed to set things up so that all components are installed to the
> same place, which is fine for development but not suitable for testing or
> shipping. A proper solution would install only the components needed for an
> individual application.
>
>
>
> The new EXCLUDE_FROM_ALL option for the install command overcomes one of
> the biggest hurdles to reaching that goal. I can now add that option to
> every install command, generate a list of component names, and add a custom
> target for each application which invokes CMake and has it install only the
> relevant components.
>
>
>
> The problem now is that I can only install one component at a time, and
> that invoking CMake 200+ times to install them all individually is
> unacceptably slow.
>
>
>
> Looking at the install scripts CMake generates I see lines like this:
>
>
>
> > if("${CMAKE_INSTALL_COMPONENT}" STREQUAL "foobar" OR NOT
> CMAKE_INSTALL_COMPONENT)
>
>
>
> The install process would become much more flexible if STREQUAL were
> changed to IN_LIST. As far as I can see this change: a) has no performance
> penalty when the component value isn’t a list and b) would be backwards
> compatible unless an individual component name contained a semicolon (which
> seems an unlikely scenario).
>
>
>
> What do the developers think?
>
>
As a side note, I have pointed problems with similar setup, in particular
when you want to be able to debug too just after a build, in a context
which look like an installed app, with only
the files necessary for the app.
The discussion led to a ticket for a potential feature:
https://gitlab.kitware.com/cmake/cmake/issues/15450
Discussion ended there:
http://public.kitware.com/pipermail/cmake/2015-March/060120.html


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