[Development] Problems building 6.11.0 on windows

[Aurélien Brooke]

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) 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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