[Development] Problems building 6.11.0 on windows

[Philippe]

Thanks and well done on your solution :)

Philippe

On Sat, 4 Apr 2026 11:47:41 +0200
Aurélien Brooke <aurelien.brooke at gmail.com> wrote:

Hi Philippe,
> 
> 
> If you can modify your Qt, you may be interested in my patch https://codereview.qt-project.org/c/qt/qtmultimedia/+/713500 that fixes LTCG in Qt6MultimediaQuick.
> 
> 
> It won't be accepted by Qt Maintainers, sadly.
> 
> 
> Best,
> 
> 
> Aurélien
> 
> 
> 
> Le ven. 3 avr. 2026 à 09:47, Philippe <philwave at gmail.com> a écrit :
> 
> Probably not the same reason, but I also had a problem building Qt
>> 6.11.0 on Windows. In my case, this was a linker error when building Qt6MultimediaQuick
>> 
>> I could solve the problem by NOT using -ltcg (link time code
>> optimization).
>> 
>> I have been using  -ltcg for many years without any problem, but with
>> the latest MSVC 2022 build and Qt 6.11.0, -ltcg removed too much stuff.
>> 
>> Philippe
>> 
>> 
>> On Fri, 3 Apr 2026 04:49:31 +0000
>> Scott Bloom <scott at towel42.com> wrote:
>> 
>> > Ill re-run the configure, but there was nothing after the warning.
>> > 
>> > I finally gave up on building webview and the other web (only built webchannel) but I still got that message.
>> > 
>> > Its almost as if the logic is setup to assume there is a problem in the dependencies and it writes out the header even when there are no dependencies missing.
>> > 
>> > Scott
>> > 
>> > -----Original Message-----
>> > From: Development <development-bounces at qt-project.org> On Behalf Of Thiago Macieira
>> > Sent: Thursday, April 2, 2026 19:38
>> > To: development at qt-project.org
>> > Subject: Re: [Development] Problems building 6.11.0 on windows
>> > 
>> > On Thursday, 2 April 2026 12:42:13 Pacific Daylight Time Scott Bloom wrote:
>> > > However, configure still reports "WARNING: Qt WebEngine And Qt Pdf 
>> > > SBOM generation will be skipped due to missing dependencies."
>> > > 
>> > > However nothing is listed below.  I have attached the config.summary.
>> > 
>> > The summary is too short. Please include the full output of CMake.
>> > 
>> > Do you have a legal requirement to generate the SBOM? If not, you can just ignore that warning.
>> > 
>> > If you do have a requirement, that message is coming from qtwebengine/ configure.cmake, near the bottom. And you should see it prints a message of what is missing: either Python is missing or (I'm guessing) some module that SBOM requires.
>> > 
>> > --
>> > Thiago Macieira - thiago.macieira (AT) <http://intel.com>intel.com
>> >   Principal Engineer - Intel DCG - Platform & Sys. Eng.
>> > -- 
>> > Development mailing list
>> > Development at qt-project.org
>> > https://lists.qt-project.org/listinfo/development
>> 
>> 
>> -- 
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