[bug#69554] [PATCH v2] build-system: cmake: Build tests depending on `#:tests?`.

[Greg Hogan]

On Tue, Jul 16, 2024 at 11:37 AM Hartmut Goebel
<h.goebel@crazy-compilers.com> wrote:
>
> Am 15.07.24 um 11:40 schrieb Ludovic Courtès:
>
> My understanding is that ‘BUILD_TESTING’ is not standard, as the last
> sentence above suggests.  Thus I’m reluctant to passing this flag
> unconditionally, as I guess it would fail for ‘CMakeLists.txt’ that do
> not implement it, right?
>
> I just tested it, and all you get is a warning:
>
> $ cat CMakeLists.txt
> cmake_minimum_required(VERSION 3.0)
> project(doo)
> $ cmake -DBUILD_TESTING=OFF .
> …
> -- Generating done (0.0s)
> CMake Warning:
>  Manually-specified variables were not used by the project:
>
>    BUILD_TESTING
>
>
> -- Build files have been written to: /tmp/xxx

Hi Hartmut,

Could we detect with `cmake -L` [1] that the package has a
BUILD_TESTING option and only then pass this flag?

[1] 
https://cmake.org/cmake/help/latest/manual/cmake.1.html#cmdoption-cmake-L-A-H

Greg