configuring QT with webassembly issue: failed on Qt6ProtobufTools, WrapProtoc not found

cebuger

I was trying to build QT 6.5.2 to generate WebAssembly library framework. I followed instructions in https://doc.qt.io/qt-6/wasm.html as well as this post https://forum.qt.io/topic/137522/build-qt-6-3-0-to-generate-webassembly-library-framework

I downloaded emsdk set it up and run it like this

./emsdk install 3.1.25
./emsdk activate 3.1.25

i went to my QT source

cd C:\Qt\6.5.2\Src

and ran

./configure.bat -qt-host-path C:\Qt\6.5.2\mingw_64 -no-warnings-are-errors -feature-opengles3  -device-option QT_EMSCRIPTEN_ASYNCIFY=1 -platform wasm-emscripten -prefix $PWD/qtbase

but i enouncter an issue that is blocking me

-- Configuring submodule 'qtwebengine'
[QtWebEngine] -- Support check for QtWebEngine failed: Build can be done only on Linux, Windows or macOS.
[QtWebEngine] -- Support check for QtPdf failed: Build can be done only on Linux, Windows, macO, iOS and Android(on non-Windows hosts only).
-- Configuring submodule 'qtdoc'
-- Configuring submodule 'qtgrpc'
CMake Warning at qtgrpc/src/tools/host/CMakeLists.txt:20 (find_package):
  Found package configuration file:

    C:/Qt/6.5.2/mingw_64/lib/cmake/Qt6ProtobufTools/Qt6ProtobufToolsConfig.cmake

  but it set Qt6ProtobufTools_FOUND to FALSE so package "Qt6ProtobufTools" is
  considered to be NOT FOUND.  Reason given by package:

  Qt6ProtobufTools could not be found because dependency WrapProtoc could not
  be found.



CMake Warning at qtgrpc/src/tools/host/CMakeLists.txt:28 (find_package):
  Found package configuration file:

    C:/Qt/6.5.2/mingw_64/lib/cmake/Qt6GrpcTools/Qt6GrpcToolsConfig.cmake

  but it set Qt6GrpcTools_FOUND to FALSE so package "Qt6GrpcTools" is
  considered to be NOT FOUND.  Reason given by package:

  Qt6GrpcTools could not be found because dependency WrapProtoc could not be
  found.



CMake Error at qtbase/cmake/QtPublicTargetHelpers.cmake:257 (get_property):
  get_property could not find TARGET Qt6::qtprotobufgen.  Perhaps it has not
  yet been created.
Call Stack (most recent call first):
  C:/Qt/6.5.2/mingw_64/lib/cmake/Qt6ProtobufTools/Qt6ProtobufToolsConfig.cmake:56 (__qt_internal_promote_target_to_global)
  qtbase/cmake/QtToolHelpers.cmake:642 (find_package)
  qtbase/cmake/QtToolHelpers.cmake:72 (qt_internal_find_tool)
  qtgrpc/src/tools/qtprotobufgen/CMakeLists.txt:5 (qt_internal_add_tool)


CMake Warning at qtbase/cmake/QtToolHelpers.cmake:642 (find_package):
  Found package configuration file:

    C:/Qt/6.5.2/mingw_64/lib/cmake/Qt6ProtobufTools/Qt6ProtobufToolsConfig.cmake

  but it set Qt6ProtobufTools_FOUND to FALSE so package "Qt6ProtobufTools" is
  considered to be NOT FOUND.  Reason given by package:

  Qt6ProtobufTools could not be found because dependency WrapProtoc could not
  be found.

Call Stack (most recent call first):
  qtbase/cmake/QtToolHelpers.cmake:72 (qt_internal_find_tool)
  qtgrpc/src/tools/qtprotobufgen/CMakeLists.txt:5 (qt_internal_add_tool)


CMake Error at qtbase/cmake/QtToolHelpers.cmake:684 (message):
  Failed to find the host tool "Qt6::qtprotobufgen".  It is part of the
  Qt6ProtobufTools package, but the package could not be found.  Make sure
  you have built and installed the host Protobuf module, which will ensure
  the creation of the Qt6ProtobufTools package.
Call Stack (most recent call first):
  qtbase/cmake/QtToolHelpers.cmake:72 (qt_internal_find_tool)
  qtgrpc/src/tools/qtprotobufgen/CMakeLists.txt:5 (qt_internal_add_tool)


-- Configuring incomplete, errors occurred!
See also "C:/Qt/6.5.2/Src/CMakeFiles/CMakeOutput.log".
See also "C:/Qt/6.5.2/Src/CMakeFiles/CMakeError.log".
CMake Error at qtbase/cmake/QtProcessConfigureArgs.cmake:998 (message):
  CMake exited with code 1.

What am I missing here?

QUABS

I have this error when cross-compile Qt 6.6.1 for raspberry pi
have you installed the protobuf-compiler
you can use

$ protoc --version

to check it
The error is solved after I installed the protobuf-compiler

$ sudo apt install -y protobuf-compiler

semlanik

-skip qtgrpc also can help in this case, if you don't need it in your Qt build.

srce

@semlanik said in configuring QT with webassembly issue: failed on Qt6ProtobufTools, WrapProtoc not found:

-skip qtgrpc also can help in this case, if you don't need it in your Qt build.

Yep - or uninstall Qt Protobuf component using the maintaince tool.