[vlc-devel] Support for Windows on Arm

[Pierrick Bouvier]

Oh yes, that would be great!

If only that is missing to get full builds, that seems like a cheap move :)

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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