Tumbleweed CI image and KDECompilerSettings

[João Gouveia]

I was not aware that this was happening, that is very unusual behavior. 
I'll start by fixing my CMake script and adding the appropriate checks 
for a compiler, as you suggested.

Thank you,

João

On 12/29/24 18:00, Ben Cooksley wrote:
> On Mon, Dec 30, 2024 at 5:26 AM João Gouveia 
> <joaotalonegouveia at gmail.com> wrote:
>
>     Hi everyone,
>
> Hi João,
>
>     It seems that the CI image for OpenSUSE's Tumbleweed does not use
>     a version of Clang that supports the -fhardened compiler flag (see
>     this job log
>     <https://invent.kde.org/joaotgouveia/mankalaengine/-/jobs/2411881>,
>     line 484). This flag is being set by ECM's KDECompilerSettings
>     (source
>     <https://github.com/KDE/extra-cmake-modules/blob/master/kde-modules/KDECompilerSettings.cmake#L614C1-L614C60>).
>     Am I misconfiguring something, or is this a genuine issue? If this
>     is not the appropriate place to discuss this, please let me know.
>
>
> It looks like you're doing something very unusual here, as I don't see 
> any search for a conventional C compiler that most KDE projects do - 
> and the compiler that CMake said it found was GCC, not Clang.
> Yet it is Clang that ends up being used.
>
> I'll note that -fhardened flag is a GCC flag - which is why there are 
> logic checks in KDECompilerSettings beforehand, but those rely on what 
> CMake said it found.
>
> So the fix here is to find how/why we end up using Clang even though 
> we said we were going to be using GCC.
>
> I will note that Clang is not present in these images to be used as a 
> compiler - it is there to provide support for KDevelop and Clazy 
> (which make use of parts of Clang in their parsers) as well as for the 
> clang-format utility.
> See the various comments around Clang in 
> https://invent.kde.org/sysadmin/ci-images/-/blob/master/suse-qt68/Dockerfile
> The supported compiler for this image is GCC.
>
>     Best regards,
>
>     João
>
>
> Cheers,
> Ben
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