Issue with QtWebEngine compilation using VS 2019

Cobra91151 · 26 Sept 2022, 16:08

Hello!

I want to build QtWebEngine module for Visual Studio 2019 but it fails.

Output:

[5382/18061] CXX obj/third_party/protobuf/protobuf_full/extension_set_heavy.obj
FAILED: obj/third_party/protobuf/protobuf_full/extension_set_heavy.obj
ninja -t msvc -e environment.x86 -- "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.29.30133\bin\HostX64\x86/cl.exe" /nologo /showIncludes /FC @obj/third_party/protobuf/protobuf_full/extension_set_heavy.obj.rsp /c ../../../../qtwebengine/src/3rdparty/chromium/third_party/protobuf/src/google/protobuf/extension_set_heavy.cc /Foobj/third_party/protobuf/protobuf_full/extension_set_heavy.obj /Fd"obj/third_party/protobuf/protobuf_full_cc.pdb"
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\repeated_field.h(294): error C2374: 'kRepHeaderSize': redefinition; multiple initialization
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\repeated_field.h(294): note: see declaration of 'kRepHeaderSize'
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\repeated_field.h(295): note: while compiling class template static data member 'const size_t google::protobuf::RepeatedField<google::protobuf::int32>::kRepHeaderSize'
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\repeated_field.h(1045): note: while compiling class template member function 'int google::protobuf::RepeatedField<google::protobuf::int32>::size(void) const'
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\descriptor.pb.h(3844): note: see reference to function template instantiation 'int google::protobuf::RepeatedField<google::protobuf::int32>::size(void) const' being compiled
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\descriptor.pb.h(500): note: see reference to class template instantiation 'google::protobuf::RepeatedField<google::protobuf::int32>' being compiled
[5386/18061] CXX obj/third_party/protobuf/protobuf_full/generated_message_reflection.obj
FAILED: obj/third_party/protobuf/protobuf_full/generated_message_reflection.obj
ninja -t msvc -e environment.x86 -- "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.29.30133\bin\HostX64\x86/cl.exe" /nologo /showIncludes /FC @obj/third_party/protobuf/protobuf_full/generated_message_reflection.obj.rsp /c ../../../../qtwebengine/src/3rdparty/chromium/third_party/protobuf/src/google/protobuf/generated_message_reflection.cc /Foobj/third_party/protobuf/protobuf_full/generated_message_reflection.obj /Fd"obj/third_party/protobuf/protobuf_full_cc.pdb"
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\repeated_field.h(294): error C2374: 'kRepHeaderSize': redefinition; multiple initialization
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\repeated_field.h(294): note: see declaration of 'kRepHeaderSize'
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\repeated_field.h(295): note: while compiling class template static data member 'const size_t google::protobuf::RepeatedField<google::protobuf::int32>::kRepHeaderSize'
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\repeated_field.h(1045): note: while compiling class template member function 'int google::protobuf::RepeatedField<google::protobuf::int32>::size(void) const'
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\descriptor.pb.h(3844): note: see reference to function template instantiation 'int google::protobuf::RepeatedField<google::protobuf::int32>::size(void) const' being compiled
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\descriptor.pb.h(500): note: see reference to class template instantiation 'google::protobuf::RepeatedField<google::protobuf::int32>' being compiled
[5391/18061] CXX obj/third_party/protobuf/protobuf_full/message.obj
ninja: build stopped: subcommand failed.
NMAKE : fatal error U1077: 'call' : return code '0x1'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.29.30133\bin\HostX64\x86\nmake.exe"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: '(' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.

C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtBuild>

I think, the issue is in this file: repeated_field.h(294): error C2374: 'kRepHeaderSize': redefinition; multiple initialization

Source code (repeated_field.h):

int current_size_;
 int total_size_;
 struct Rep {
   Arena* arena;
   Element elements[1];
 };
 // We can not use sizeof(Rep) - sizeof(Element) due to the trailing padding on
 // the struct. We can not use sizeof(Arena*) as well because there might be
 // a "gap" after the field arena and before the field elements (e.g., when
 // Element is double and pointer is 32bit).
 static const size_t kRepHeaderSize;
 // Contains arena ptr and the elements array. We also keep the invariant that
 // if rep_ is NULL, then arena is NULL.
 Rep* rep_;

 friend class Arena;
 typedef void InternalArenaConstructable_;

 // Move the contents of |from| into |to|, possibly clobbering |from| in the
 // process.  For primitive types this is just a memcpy(), but it could be
 // specialized for non-primitive types to, say, swap each element instead.
 void MoveArray(Element* to, Element* from, int size);

 // Copy the elements of |from| into |to|.
 void CopyArray(Element* to, const Element* from, int size);

 inline void InternalSwap(RepeatedField* other);

 // Internal helper expected by Arena methods.
 inline Arena* GetArenaNoVirtual() const {
   return (rep_ == NULL) ? NULL : rep_->arena;
 }

 // Internal helper to delete all elements and deallocate the storage.
 // If Element has a trivial destructor (for example, if it's a fundamental
 // type, like int32), the loop will be removed by the optimizer.
 void InternalDeallocate(Rep* rep, int size) {
   if (rep != NULL) {
     Element* e = &rep->elements[0];
     Element* limit = &rep->elements[size];
     for (; e < limit; e++) {
       e->Element::~Element();
     }
     if (rep->arena == NULL) {
       delete[] reinterpret_cast<char*>(rep);
     }
   }
 }
};

template<typename Element>
const size_t RepeatedField<Element>::kRepHeaderSize =
   reinterpret_cast<size_t>(&reinterpret_cast<Rep*>(16)->elements[0]) - 16;

I see that variable static const size_t kRepHeaderSize; is already declared and then below on line 294, the same variable is declared the second time and initialized to: const size_t RepeatedField<Element>::kRepHeaderSize = reinterpret_cast<size_t>(&reinterpret_cast<Rep*>(16)->elements[0]) - 16;

I see one option here, for example to delete this variable first initialization: static const size_t kRepHeaderSize; . Any ideas what is the better solution to fix this issue? Thanks.

JKSH · wrote on 28 Sept 2022, 02:49

@Cobra91151 said in Issue with QtWebEngine compilation using VS 2019:

Is it possible to build newest QtWebEngine module against old Qt version? It could be not the latest QtWebEngine but for example module from Qt 5.14.X? Or the QtWebEngine module is strickly related to the Qt version and it is not possible to compile it? Thank you.

The official policy is that newer versions of Qt WebEngine officially supports down to the last LTS version of Qt:

So Qt WebEngine 5.15 can be built with Qt 5.12, and Qt WebEngine 5.12 can be built with Qt 5.9.

Just be aware that old versions put you at risk of security vulnerabilities.

JonB · 26 Sept 2022, 16:20

@Cobra91151 said in Issue with QtWebEngine compilation using VS 2019:

qt-everywhere-opensource-src-5.9.9

Hi, you probably know better than I, but would it be better to try a later version than 5.9 for VS 2019?

Cobra91151 · 26 Sept 2022, 16:23

@JonB

I need only Qt 5.9.9 for my project. So, I can not use later Qt version.

JonB · wrote on 26 Sept 2022, 16:23

@Cobra91151 Fair enough, that's an important piece of information!

Cobra91151 · wrote on 26 Sept 2022, 17:26

I have commented the first initialization: //static const size_t kRepHeaderSize;

But it leads to this error:
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\repeated_field.h(294): error C2039: 'kRepHeaderSize': is not a member of 'google::protobuf::RepeatedField<Element>;

So, my solution is wrong. Also, I checked and found the third variable declaration and initialization on line: 526;

static const size_t kRepHeaderSize = sizeof(Rep) - sizeof(void*);

Christian Ehrlicher · 26 Sept 2022, 17:54

I would say it's an to old version of protobuf to be compilable with VS2019. But take a look here: https://github.com/protocolbuffers/protobuf/commit/a1fca10ddc2c758cafaa6891d4ef971b8a0d06b0

constexpr to the rescue!
But I would guess there will be more problems later on.

Cobra91151 · wrote on 26 Sept 2022, 17:54

@Christian-Ehrlicher

Ok. I will check it. Thank you.

Cobra91151 · wrote on 26 Sept 2022, 21:54

@Christian-Ehrlicher

I have set constexpr to:

static constexpr size_t kRepHeaderSize;

template<typename Element>
constexpr size_t RepeatedField<Element>::kRepHeaderSize =
    reinterpret_cast<size_t>(&reinterpret_cast<Rep*>(16)->elements[0]) - 16;

static constexpr size_t kRepHeaderSize = sizeof(Rep) - sizeof(void*);

Now, I get this issue: repeated_field.h(253): error C2737: 'private: static unsigned int const google::protobuf::RepeatedField<int>::kRepHeaderSize': constexpr object must be initialized

[5357/18061] CXX obj/third_party/protobuf/protobuf_full/extension_set.obj
FAILED: obj/third_party/protobuf/protobuf_full/extension_set.obj
ninja -t msvc -e environment.x86 -- "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.29.30133\bin\HostX64\x86/cl.exe" /nologo /showIncludes /FC @obj/third_party/protobuf/protobuf_full/extension_set.obj.rsp /c ../../../../qtwebengine/src/3rdparty/chromium/third_party/protobuf/src/google/protobuf/extension_set.cc /Foobj/third_party/protobuf/protobuf_full/extension_set.obj /Fd"obj/third_party/protobuf/protobuf_full_cc.pdb"
C:\QtBuild\qt-everywhere-opensource-src-5.9.9\qtwebengine\src\3rdparty\chromium\third_party\protobuf\src\google\protobuf\repeated_field.h(253): error C2737: 'private: static unsigned int const google::protobuf::RepeatedField<int>::kRepHeaderSize': constexpr object must be initialized

On 253 line, there is not initialized variable: static constexpr size_t kRepHeaderSize;
I think, I must initialize it to some value.
I have set this variable to value: static constexpr size_t kRepHeaderSize = sizeof(Arena*) < sizeof(Element) ? sizeof(Element) : sizeof(Arena*);
I will try again to see the result.

Cobra91151 · 28 Sept 2022, 02:49

@Christian-Ehrlicher

Yes, you are right. It leads to another errors, then I fix them and again to another errors and so on. I do not have time to play around with it.

Is it possible to build newest QtWebEngine module against old Qt version? It could be not the latest QtWebEngine but for example module from Qt 5.14.X? Or the QtWebEngine module is strickly related to the Qt version and it is not possible to compile it? Thank you.

Christian Ehrlicher · 27 Sept 2022, 16:09

Sorry, I'm not sure about the policy of the QWebEngine module wrt. to source backwards compatibility. You have to try it out by yourself.
Maybe you can simply update the whole protobuf lib?

Cobra91151 · wrote on 27 Sept 2022, 16:09

@Christian-Ehrlicher

Hello!

Ok. I think, I will try to use Qt 5.15.6, but from what I have checked, I need to adapt the project code, since there are some issues between Qt 5.9.9 and Qt 5.15.6. Anyway, thank you for your help.

JonB · 27 Sept 2022, 17:21

@JonB said in Issue with QtWebEngine compilation using VS 2019:

Hi, you probably know better than I, but would it be better to try a later version than 5.9 for VS 2019?

@Cobra91151 said in Issue with QtWebEngine compilation using VS 2019:

I need only Qt 5.9.9 for my project. So, I can not use later Qt version.

:D Friendly grin :)

Cobra91151 · J JonB 27 Sept 2022, 16:11

@JonB

I have compiled Qt 5.9.9 for VS2019 successfully. But on X64 architecture the windeployqt.exe distributes the wrong Qt libs in Debug mode.
When I try to set to use only debug libs: QMAKE_POST_LINK = $$(QTDIR)/bin/windeployqt.exe $$shell_quote($$DESTDIR/$$shell_quote($$TARGET).exe) --debug --no-compiler-runtime it displays the following error:

C:\Qt\5.9.9\msvc2019_64\bin\Qt5Coredd.dll does not exist.

Otherwise it distributes the release libs and produce such error:

This application failed to start because it could not find or load the Qt platform plugin "windows"
in "".

Reinstalling the application may fix this problem.

The lib in Debug mode should be Qt5Cored.dll not Qt5Coredd.dll. Any ideas how to fix this issue with windeployqt tool? Thanks.

Cobra91151 · wrote on 27 Sept 2022, 17:56

It happens only with new projects - x64 - Debug mode:

C:\Users\cobra\Documents\Projects\CPP\build-TestEmptyProject-Desktop_Qt_5_9_9_MSVC2019_64bit-Debug\debug\TestEmptyProject.exe 64 bit, debug executable
Adding Qt5Svg for qsvgicond.dll
Skipping plugin qtvirtualkeyboardplugind.dll due to disabled dependencies (Qt5Qml Qt5Quick).
Direct dependencies: Qt5Core Qt5Widgets
All dependencies   : Qt5Core Qt5Gui Qt5Widgets
To be deployed     : Qt5Core Qt5Gui Qt5Svg Qt5Widgets
C:\Qt\5.9.9\msvc2019_64\bin\Qt5Coredd.dll does not exist.
jom: C:\Users\cobra\Documents\Projects\CPP\build-TestEmptyProject-Desktop_Qt_5_9_9_MSVC2019_64bit-Debug\Makefile.Debug [debug\TestEmptyProject.exe] Error 1
jom: C:\Users\cobra\Documents\Projects\CPP\build-TestEmptyProject-Desktop_Qt_5_9_9_MSVC2019_64bit-Debug\Makefile [debug] Error 2
20:52:22: The process "C:\Qt\qtcreator-8.0.1\bin\jom\jom.exe" exited with code 2.
Error while building/deploying project TestEmptyProject (kit: Desktop Qt 5.9.9 MSVC2019 64bit)
When executing step "Make"
20:52:23: Elapsed time: 00:02.

I have tried Qt 5.9.9 x64 libs compiled on 4/14/2020. The same issue exists.

For x32 in Debug it works well:

20:55:25: Running steps for project TestEmptyProject...
20:55:25: Configuration unchanged, skipping qmake step.
20:55:25: Starting: "C:\Qt\qtcreator-8.0.1\bin\jom\jom.exe" 
	C:\Qt\qtcreator-8.0.1\bin\jom\jom.exe -f Makefile.Debug
	C:\Qt\5.9.9\msvc2019\bin\uic.exe ..\TestEmptyProject\dialog.ui -o ui_dialog.h
	cl -c -nologo -Zc:wchar_t -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -Zc:referenceBinding -Zi -MDd -W3 -w34100 -w34189 -w44996 -w44456 -w44457 -w44458 -wd4577 -wd4467 -EHsc /Fdresources\objects\TestEmptyProject.vc.pdb -DUNICODE -D_UNICODE -DWIN32 -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I..\TestEmptyProject -I. -IC:\Qt\5.9.9\msvc2019\include -IC:\Qt\5.9.9\msvc2019\include\QtWidgets -IC:\Qt\5.9.9\msvc2019\include\QtGui -IC:\Qt\5.9.9\msvc2019\include\QtANGLE -IC:\Qt\5.9.9\msvc2019\include\QtCore -Iresources\moc -I. -IC:\Qt\5.9.9\msvc2019\mkspecs\win32-msvc -Foresources\objects\ @C:\Users\cobra\AppData\Local\Temp\main.obj.2756.16.jom
	cl -BxC:\Qt\5.9.9\msvc2019\bin\qmake.exe -nologo -Zc:wchar_t -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -Zc:referenceBinding -Zi -MDd -W3 -w34100 -w34189 -w44996 -w44456 -w44457 -w44458 -wd4577 -wd4467 -E C:\Qt\5.9.9\msvc2019\mkspecs\features\data\dummy.cpp 2>NUL >resources\moc\moc_predefs.h
main.cpp
	cl -c -nologo -Zc:wchar_t -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -Zc:referenceBinding -Zi -MDd -W3 -w34100 -w34189 -w44996 -w44456 -w44457 -w44458 -wd4577 -wd4467 -EHsc /Fdresources\objects\TestEmptyProject.vc.pdb -DUNICODE -D_UNICODE -DWIN32 -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I..\TestEmptyProject -I. -IC:\Qt\5.9.9\msvc2019\include -IC:\Qt\5.9.9\msvc2019\include\QtWidgets -IC:\Qt\5.9.9\msvc2019\include\QtGui -IC:\Qt\5.9.9\msvc2019\include\QtANGLE -IC:\Qt\5.9.9\msvc2019\include\QtCore -Iresources\moc -I. -IC:\Qt\5.9.9\msvc2019\mkspecs\win32-msvc -Foresources\objects\ @C:\Users\cobra\AppData\Local\Temp\dialog.obj.2756.63.jom
dialog.cpp
	C:\Qt\5.9.9\msvc2019\bin\moc.exe -DUNICODE -D_UNICODE -DWIN32 -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB --compiler-flavor=msvc --include ./resources/moc/moc_predefs.h -IC:/Qt/5.9.9/msvc2019/mkspecs/win32-msvc -IC:/Users/cobra/Documents/Projects/CPP/TestEmptyProject -IC:/Qt/5.9.9/msvc2019/include -IC:/Qt/5.9.9/msvc2019/include/QtWidgets -IC:/Qt/5.9.9/msvc2019/include/QtGui -IC:/Qt/5.9.9/msvc2019/include/QtANGLE -IC:/Qt/5.9.9/msvc2019/include/QtCore -I. -I"C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.29.30133\ATLMFC\include" -I"C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Tools\MSVC\14.29.30133\include" -I"C:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um" -I"C:\Program Files (x86)\Windows Kits\10\include\10.0.22000.0\ucrt" -I"C:\Program Files (x86)\Windows Kits\10\include\10.0.22000.0\shared" -I"C:\Program Files (x86)\Windows Kits\10\include\10.0.22000.0\um" -I"C:\Program Files (x86)\Windows Kits\10\include\10.0.22000.0\winrt" -I"C:\Program Files (x86)\Windows Kits\10\include\10.0.22000.0\cppwinrt" ..\TestEmptyProject\dialog.h -o resources\moc\moc_dialog.cpp
	cl -c -nologo -Zc:wchar_t -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -Zc:referenceBinding -Zi -MDd -W3 -w34100 -w34189 -w44996 -w44456 -w44457 -w44458 -wd4577 -wd4467 -EHsc /Fdresources\objects\TestEmptyProject.vc.pdb -DUNICODE -D_UNICODE -DWIN32 -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I..\TestEmptyProject -I. -IC:\Qt\5.9.9\msvc2019\include -IC:\Qt\5.9.9\msvc2019\include\QtWidgets -IC:\Qt\5.9.9\msvc2019\include\QtGui -IC:\Qt\5.9.9\msvc2019\include\QtANGLE -IC:\Qt\5.9.9\msvc2019\include\QtCore -Iresources\moc -I. -IC:\Qt\5.9.9\msvc2019\mkspecs\win32-msvc -Foresources\objects\ @C:\Users\cobra\AppData\Local\Temp\moc_dialog.obj.2756.704.jom
moc_dialog.cpp
	link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /SUBSYSTEM:WINDOWS "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='*' processorArchitecture='*'" /MANIFEST:embed /OUT:debug\TestEmptyProject.exe @C:\Users\cobra\AppData\Local\Temp\TestEmptyProject.exe.2756.1813.jom
	C:\Qt\5.9.9\msvc2019/bin/windeployqt.exe C:/Users/cobra/Documents/Projects/CPP/build-TestEmptyProject-Desktop_Qt_5_9_9_MSVC2019_32bit-Debug/debug/TestEmptyProject.exe --debug --no-compiler-runtime
C:\Users\cobra\Documents\Projects\CPP\build-TestEmptyProject-Desktop_Qt_5_9_9_MSVC2019_32bit-Debug\debug\TestEmptyProject.exe 32 bit, debug executable
Adding Qt5Svg for qsvgicond.dll
Skipping plugin qtvirtualkeyboardplugind.dll due to disabled dependencies (Qt5Qml Qt5Quick).
Direct dependencies: Qt5Core Qt5Widgets
All dependencies   : Qt5Core Qt5Gui Qt5Widgets
To be deployed     : Qt5Core Qt5Gui Qt5Svg Qt5Widgets
Qt5Cored.dll is up to date.
Qt5Guid.dll is up to date.
Qt5Svgd.dll is up to date.
Qt5Widgetsd.dll is up to date.
libGLESV2d.dll is up to date.
libEGLd.dll is up to date.
d3dcompiler_47.dll is up to date.
Patching Qt5Cored.dll...
qsvgicond.dll is up to date.
qgifd.dll is up to date.
qicnsd.dll is up to date.
qicod.dll is up to date.
qjpegd.dll is up to date.
qsvgd.dll is up to date.
qtgad.dll is up to date.
qtiffd.dll is up to date.
qwbmpd.dll is up to date.
qwebpd.dll is up to date.
qwindowsd.dll is up to date.
Creating qt_ar.qm...
Creating qt_bg.qm...
Creating qt_ca.qm...
Creating qt_cs.qm...
Creating qt_da.qm...
Creating qt_de.qm...
Creating qt_en.qm...
Creating qt_es.qm...
Creating qt_fi.qm...
Creating qt_fr.qm...
Creating qt_gd.qm...
Creating qt_he.qm...
Creating qt_hu.qm...
Creating qt_it.qm...
Creating qt_ja.qm...
Creating qt_ko.qm...
Creating qt_lv.qm...
Creating qt_pl.qm...
Creating qt_ru.qm...
Creating qt_sk.qm...
Creating qt_uk.qm...
20:55:28: The process "C:\Qt\qtcreator-8.0.1\bin\jom\jom.exe" exited normally.
20:55:28: Elapsed time: 00:03.

I think, it is a bug with windeployqt tool. Can someone confirm it? Thanks.

Cobra91151 · wrote on 27 Sept 2022, 18:58

I have fixed this issue by replacing the windeployqt tool from Qt 5.15.6. Now, it works for Qt 5.9.9 without issues.

Also, I will try to build QtWebEngine module from Qt 5.15.6 source using Qt 5.9.9 to test it.

JKSH · wrote on 28 Sept 2022, 02:49

@Cobra91151 said in Issue with QtWebEngine compilation using VS 2019:

Is it possible to build newest QtWebEngine module against old Qt version? It could be not the latest QtWebEngine but for example module from Qt 5.14.X? Or the QtWebEngine module is strickly related to the Qt version and it is not possible to compile it? Thank you.

The official policy is that newer versions of Qt WebEngine officially supports down to the last LTS version of Qt:

So Qt WebEngine 5.15 can be built with Qt 5.12, and Qt WebEngine 5.12 can be built with Qt 5.9.

Just be aware that old versions put you at risk of security vulnerabilities.