[vlc-devel] Support for Windows on Arm

[Steve Lhomme]

On 2022-09-09 11:09, Pierrick Bouvier wrote:
> Oh yes, that would be great!
> 
> If only that is missing to get full builds, that seems like a cheap move :)

Well, it doesn't build yet:
https://code.videolan.org/robUx4/vlc/-/jobs/1134131

Some call to MemoryBarrier() in some gettext tool.

> On 9/9/22 11:03, Steve Lhomme wrote:
>> On 2022-09-09 10:52, Martin Storsjö wrote:
>>> On Fri, 9 Sep 2022, Pierrick Bouvier wrote:
>>>
>>>> On 9/9/22 10:39, Martin Storsjö wrote:
>>>>> On Fri, 9 Sep 2022, Pierre Lamot wrote:
>>>>>
>>>>>>
>>>>>> On 09/09/2022 10:29, Steve Lhomme wrote:
>>>>>>> out of the box for Windows ARM. It should build like the other 
>>>>>>> Windows
>>>>>>> targets except adding `-a aarch64` to build.sh. It should work with
>>>>>>> the LLVM Dockers we use (or any llvm-mingw build). Not sure there's
>>>>>>> mingw-w64 for ARM available.
>>>>>>>
>>>>>>> There may be some contribs that don't build properly, for example Qt
>>>>>>> may refuse to build or not understand what's going on. And if it
>>>>>>> builds it's not
>>>>>>
>>>>>> according to your website [1], qt for windows arm requires version 
>>>>>> 6.2,
>>>>>> but we only support Qt 5, so this may indeed be a problem if you
>>>>>> plan to
>>>>>> build the UI
>>>>>
>>>>> I dunno what that information that website is based on, but with
>>>>> upstream
>>>>> Qt (plain Qt Core) it has worked fine since around Qt 5.11 with
>>>>> llvm-mingw. Maybe it's based on what they have tested themselves?
>>>>>
>>>>> It runs just fine with the Qt backported patches in VLC's contrib, on
>>>>> both
>>>>> the 3.0.x and master branches.
>>>>>
>>>>
>>>> We observed issues with previous version. For instance, with cmake-gui
>>>> that is crashing on startup. It's good to know it's working for VLC.
>>>
>>> Ok, that's good to know. FWIW, if there's an issue with older versions
>>> but which is fixed in newer ones, it's usually quite straightforward to
>>> do a reverse bisect to find out which commit fixed it, and then backport
>>> that one to the version of Qt that is used. (VLC carries half a dozen of
>>> backported Qt patches, for building the ancient Qt 5.6 with modern
>>> compilers.)
>>>
>>>> Officially, Qt is advertising support for Windows on Arm from Qt6 [1],
>>>> while Qt5 does not mention it [2]. In more, prebuilt versions are only
>>>> available since Qt6. Not every project builds Qt from source ;).
>>>
>>> Well the prebuilt binaries don't really help people in the mingw
>>> ecosystem anyway, as those are MSVC only. And in practice I don't know
>>> of any more concrete efforts from Qt's side here (but I may have missed
>>> something) other than doing regular builds of it. But for sure, newer
>>> versions generally do come with more fixes that need to be backported if
>>> using older versions.
>>
>> BTW, I completely forgot that we do have windows ARM 64-bit building in
>> our CI already. But Qt is disabled and also mistakenly as a UWP build. I
>> can try to change it to a full desktop build and see how it goes.
>>
>> https://code.videolan.org/videolan/vlc/-/jobs/1134041
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