GCC LTO breaks color management in Plasma 6.3.0

[Neal Gompa]

On Thu, Feb 13, 2025 at 7:01 AM Vlad Zahorodnii <vlad.zahorodnii at kde.org> wrote:
>
> Hello,
>
> We've received a number of complaints from Plasma Wayland users about
> screen turning black when using an ICC profile (which contains a BToA
> tag) and the new "Prefer color accuracy" setting. [1]
>
> The issue is reproducible only when kwin is built with GCC + LTO. If
> kwin is built in the debug mode or the release mode but without LTO, the
> issue is not reproducible. The issue is also not reproducible when using
> clang + LTO.
>
> It might be worth to disable LTO when building kwin 6.3.0.
>
> Regards,
> Vlad
>
> [1] https://bugs.kde.org/show_bug.cgi?id=499789
>

Is there a corresponding upstream GCC bug report about this? Also, the
linked bug report doesn't mention anything about LTO. How did we
determine LTO is the cause?


-- 
真実はいつも一つ！/ Always, there's only one truth!