Qt6BundledZLIB not found

qwendt

I want to build a Qt WebAssembly with CLion which seems way harder then I thought. I do not understand why there are so many more problems then if i just run it via the terminal...

I included the environment file in the Toolchain and set the C/C++ compilers there.

export EMSDK=/home/emmynoether/emsdk
export EM_CONFIG=/home/emmynoether/emsdk/.emscripten
export QMAKESPEC=wasm-emscripten
export QT_WEBASSEMBLY_ROOT_PATH=/home/emmynoether/Qt/6.8.3/wasm_singlethread
export PATH="/home/emmynoether/emsdk/upstream/emscripten:/home/emmynoether/emsdk/node/22.16.0_64bit/bin:$PATH"

I gave the CMake Options for Host and Target Qt:

-DQt6_DIR=/home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6
-DQT_HOST_PATH=/home/emmynoether/Qt/6.8.3/gcc_64

Now i get the error

/home/emmynoether/Downloads/clion-2025.1.3/bin/cmake/linux/x64/bin/cmake -DCMAKE_MAKE_PROGRAM=ninja -DCMAKE_C_COMPILER=/home/emmynoether/emsdk/upstream/emscripten/emcc -DCMAKE_CXX_COMPILER=/home/emmynoether/emsdk/upstream/emscripten/em++ -DQt6_DIR=/home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6 -DQT_HOST_PATH=/home/emmynoether/Qt/6.8.3/gcc_64 -G Ninja -S /home/emmynoether/Dokumente/Webseite/MaterialStack -B /home/emmynoether/Dokumente/Webseite/MaterialStack/cmake-build-default-qt-webassembly
-- The CXX compiler identification is Clang 19.0.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - failed
-- Check for working CXX compiler: /home/emmynoether/emsdk/upstream/emscripten/em++
-- Check for working CXX compiler: /home/emmynoether/emsdk/upstream/emscripten/em++ - works
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- CMAKE_CXX_COMPILER = /home/emmynoether/emsdk/upstream/emscripten/em++
-- ENV EMSDK = /home/emmynoether/emsdk
-- ENV EM_CONFIG = /home/emmynoether/emsdk/.emscripten
-- PATH = /home/emmynoether/emsdk/upstream/emscripten:/home/emmynoether/emsdk/node/22.16.0_64bit/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/emmynoether/.dotnet/tools:/home/emmynoether/Downloads/clion-2025.1.3/bin/ninja/linux/x64
-- Qt6_DIR   = /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6
-- HOME  = /home/emmynoether
CMake Warning at /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6/QtFindWrapHelper.cmake:69 (find_package):
  By not providing "FindQt6BundledZLIB.cmake" in CMAKE_MODULE_PATH this
  project has asked CMake to find a package configuration file provided by
  "Qt6BundledZLIB", but CMake did not find one.

  Could not find a package configuration file provided by "Qt6BundledZLIB"
  with any of the following names:

    Qt6BundledZLIBConfig.cmake
    qt6bundledzlib-config.cmake

  Add the installation prefix of "Qt6BundledZLIB" to CMAKE_PREFIX_PATH or set
  "Qt6BundledZLIB_DIR" to a directory containing one of the above files.  If
  "Qt6BundledZLIB" provides a separate development package or SDK, be sure it
  has been installed.
Call Stack (most recent call first):
  /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6/FindWrapZLIB.cmake:6 (qt_find_package_system_or_bundled)
  /home/emmynoether/Downloads/clion-2025.1.3/bin/cmake/linux/x64/share/cmake-3.31/Modules/CMakeFindDependencyMacro.cmake:76 (find_package)
  /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6/QtPublicDependencyHelpers.cmake:36 (find_dependency)
  /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6Core/Qt6CoreDependencies.cmake:38 (_qt_internal_find_third_party_dependencies)
  /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6Core/Qt6CoreConfig.cmake:45 (include)
  /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6/Qt6Config.cmake:196 (find_package)
  CMakeLists.txt:16 (find_package)


CMake Error at /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6/QtFindWrapHelper.cmake:120 (message):
  Can't find Qt6::BundledZLIB.
Call Stack (most recent call first):
  /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6/FindWrapZLIB.cmake:6 (qt_find_package_system_or_bundled)
  /home/emmynoether/Downloads/clion-2025.1.3/bin/cmake/linux/x64/share/cmake-3.31/Modules/CMakeFindDependencyMacro.cmake:76 (find_package)
  /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6/QtPublicDependencyHelpers.cmake:36 (find_dependency)
  /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6Core/Qt6CoreDependencies.cmake:38 (_qt_internal_find_third_party_dependencies)
  /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6Core/Qt6CoreConfig.cmake:45 (include)
  /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6/Qt6Config.cmake:196 (find_package)
  CMakeLists.txt:16 (find_package)


CMake Warning at /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6/Qt6Config.cmake:196 (find_package):
  Found package configuration file:

    /home/emmynoether/Qt/6.8.3/wasm_singlethread/lib/cmake/Qt6Core/Qt6CoreConfig.cmake

  but it set Qt6Core_FOUND to FALSE so package "Qt6Core" is considered to be
  NOT FOUND.
Call Stack (most recent call first):
  CMakeLists.txt:16 (find_package)


-- Configuring incomplete, errors occurred!

Axel Spoerl

Hi!
The 6.8 build was probably configured without zlib support.
If you need it, please build it from source and add -qt-zlib to the configure line.

qwendt

@Axel-Spoerl

Thank you, yes I needed to compile Qt by myself. This solved my Problem:

source /home/emmynoether/emsdk/emsdk_env.sh
mkdir -p $HOME/qt-build && cd $HOME/qt-build
export QT_HOST_PATH=$HOME/Qt/6.8.3/gcc_64  

git clone --depth 1 --branch v6.8.3 https://code.qt.io/qt/qt5.git qt6-src
cd qt6-src

# I catched all submodules
git submodule sync              
git submodule update --init --recursive

./configure \
-xplatform wasm-emscripten \
-prefix $HOME/Qt/6.8.3/wasm_singlethread \
-opensource -confirm-license \
-nomake tests -nomake examples \
-skip qtwebengine \
-qt-zlib \
-release \
-opengl es2     


cmake --build . --parallel $(nproc)
cmake --install .

And in the CMake I added Qt6::BundledZLIB to target_link_libraries. At the end it worked to use CLion.