how to use qt6 cmake

[uvguy]

Im having difficulties about using cmake qt6 in termux, trying following command, I was still unable to build very simple qtwidget project using qt6

../../../usr/lib/qt6/bin/qt-cmake -S . -Bbuild -DCMAKE_SYSTEM_NAME=Linux -DQT_REQUIRE_HOST_PATH_CHECK=NO -DQt6HostInfo_DIR=/data/data/com.termux/files/usr/lib/cmake/Qt6HostInfo -G Ninja

which produced following error

Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - yes
-- Found Threads: TRUE
-- Performing Test HAVE_STDATOMIC
-- Performing Test HAVE_STDATOMIC - Success
-- Found WrapAtomic: TRUE
-- Could NOT find OpenGL (missing: OPENGL_INCLUDE_DIR)
-- Could NOT find OpenGL (missing: OPENGL_INCLUDE_DIR)
-- Could NOT find WrapOpenGL (missing: WrapOpenGL_FOUND)
CMake Warning at /data/data/com.termux/files/usr/share/cmake-3.30/Modules/CMakeFindDependencyMacro.cmake:76 (find_package):
  Found package configuration file:

    /data/data/com.termux/files/usr/lib/cmake/Qt6Gui/Qt6GuiConfig.cmake

  but it set Qt6Gui_FOUND to FALSE so package "Qt6Gui" is considered to be
  NOT FOUND.  Reason given by package:

  Qt6Gui could not be found because dependency WrapOpenGL could not be found.

  Configuring with --debug-find-pkg=WrapOpenGL might reveal details why the
  package was not found.

  Configuring with -DQT_DEBUG_FIND_PACKAGE=ON will print the values of some
  of the path variables that find_package uses to try and find the package.

Call Stack (most recent call first):
  /data/data/com.termux/files/usr/lib/cmake/Qt6/QtPublicDependencyHelpers.cmake:143 (find_dependency)
  /data/data/com.termux/files/usr/lib/cmake/Qt6Widgets/Qt6WidgetsDependencies.cmake:43 (_qt_internal_find_qt_dependencies)
  /data/data/com.termux/files/usr/lib/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake:43 (include)
  /data/data/com.termux/files/usr/lib/cmake/Qt6/Qt6Config.cmake:181 (find_package)
  CMakeLists.txt:15 (find_package)


CMake Warning at /data/data/com.termux/files/usr/lib/cmake/Qt6/Qt6Config.cmake:181 (find_package):
  Found package configuration file:

    /data/data/com.termux/files/usr/lib/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake

  but it set Qt6Widgets_FOUND to FALSE so package "Qt6Widgets" is considered
  to be NOT FOUND.  Reason given by package:

  Qt6Widgets could not be found because dependency Qt6Gui could not be found.

  Configuring with --debug-find-pkg=Qt6Gui might reveal details why the
  package was not found.

  Configuring with -DQT_DEBUG_FIND_PACKAGE=ON will print the values of some
  of the path variables that find_package uses to try and find the package.

Call Stack (most recent call first):
  CMakeLists.txt:15 (find_package)


CMake Error at CMakeLists.txt:15 (find_package):
  Found package configuration file:

    /data/data/com.termux/files/usr/lib/cmake/Qt6/Qt6Config.cmake

  but it set Qt6_FOUND to FALSE so package "Qt6" is considered to be NOT
  FOUND.  Reason given by package:

  Failed to find required Qt component "Widgets".

  Expected Config file at
  "/data/data/com.termux/files/usr/lib/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake"
  exists



  Configuring with --debug-find-pkg=Qt6Widgets might reveal details why the
  package was not found.

  Configuring with -DQT_DEBUG_FIND_PACKAGE=ON will print the values of some
  of the path variables that find_package uses to try and find the package.



-- Configuring incomplete, errors occurred!

[Biswa96]

If you are building the project in termux with cmake and qt6 you do not need to mention those cmake option. Just use cmake -B builddir -S srcdir.

[uvguy]

this produces following error btw

-- Detecting CXX compile features - done
CMake Error at /data/data/com.termux/files/usr/lib/cmake/Qt6/QtPublicDependencyHelpers.cmake:292 (message):
  To use a cross-compiled Qt, please set the QT_HOST_PATH cache variable to
  the location of your host Qt installation.
Call Stack (most recent call first):
  /data/data/com.termux/files/usr/lib/cmake/Qt6/Qt6Dependencies.cmake:16 (_qt_internal_setup_qt_host_path)
  /data/data/com.termux/files/usr/lib/cmake/Qt6/Qt6Config.cmake:136 (include)
  CMakeLists.txt:14 (find_package)


-- Configuring incomplete, errors occurred!

[Biswa96]

Could you provide the project link and steps to reproduce the issue?

[uvguy]

table1.zip
Here is my source I attach here in the above link

[Biswa96]

This sounds similar to the #22087 issue. I have found the underlying reason. Try to change the set(__qt_platform_requires_host_info_package "TRUE") to FALSE in Qt6Dependencies.cmake. And add -DCMAKE_SYSTEM_NAME=Linux with cmake command.

This is just a workaround now. I shall try to explore the issue later.

[uvguy]

with current step

cmake -B build -S . -DCMAKE_SYSTEM_NAME=Linux

-- The CXX compiler identification is Clang 19.1.2
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /data/data/com.termux/files/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - yes
-- Found Threads: TRUE
-- Performing Test HAVE_STDATOMIC
-- Performing Test HAVE_STDATOMIC - Success
-- Found WrapAtomic: TRUE
-- Could NOT find OpenGL (missing: OPENGL_INCLUDE_DIR)
-- Could NOT find OpenGL (missing: OPENGL_INCLUDE_DIR)
-- Could NOT find WrapOpenGL (missing: WrapOpenGL_FOUND)
CMake Warning at /data/data/com.termux/files/usr/share/cmake-3.30/Modules/CMakeFindDependencyMacro.cmake:76 (find_package):
  Found package configuration file:

    /data/data/com.termux/files/usr/lib/cmake/Qt6Gui/Qt6GuiConfig.cmake

  but it set Qt6Gui_FOUND to FALSE so package "Qt6Gui" is considered to be
  NOT FOUND.  Reason given by package:

  Qt6Gui could not be found because dependency WrapOpenGL could not be found.

  Configuring with --debug-find-pkg=WrapOpenGL might reveal details why the
  package was not found.

  Configuring with -DQT_DEBUG_FIND_PACKAGE=ON will print the values of some
  of the path variables that find_package uses to try and find the package.

Call Stack (most recent call first):
  /data/data/com.termux/files/usr/lib/cmake/Qt6/QtPublicDependencyHelpers.cmake:143 (find_dependency)
  /data/data/com.termux/files/usr/lib/cmake/Qt6Widgets/Qt6WidgetsDependencies.cmake:43 (_qt_internal_find_qt_dependencies)
  /data/data/com.termux/files/usr/lib/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake:43 (include)
  /data/data/com.termux/files/usr/lib/cmake/Qt6/Qt6Config.cmake:181 (find_package)
  CMakeLists.txt:13 (find_package)


CMake Warning at /data/data/com.termux/files/usr/lib/cmake/Qt6/Qt6Config.cmake:181 (find_package):
  Found package configuration file:

    /data/data/com.termux/files/usr/lib/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake

  but it set Qt6Widgets_FOUND to FALSE so package "Qt6Widgets" is considered
  to be NOT FOUND.  Reason given by package:

  Qt6Widgets could not be found because dependency Qt6Gui could not be found.

  Configuring with --debug-find-pkg=Qt6Gui might reveal details why the
  package was not found.

  Configuring with -DQT_DEBUG_FIND_PACKAGE=ON will print the values of some
  of the path variables that find_package uses to try and find the package.

Call Stack (most recent call first):
  CMakeLists.txt:13 (find_package)


CMake Error at CMakeLists.txt:13 (find_package):
  Found package configuration file:

    /data/data/com.termux/files/usr/lib/cmake/Qt6/Qt6Config.cmake

  but it set Qt6_FOUND to FALSE so package "Qt6" is considered to be NOT
  FOUND.  Reason given by package:

  Failed to find required Qt component "Widgets".

  Expected Config file at
  "/data/data/com.termux/files/usr/lib/cmake/Qt6Widgets/Qt6WidgetsConfig.cmake"
  exists



  Configuring with --debug-find-pkg=Qt6Widgets might reveal details why the
  package was not found.

  Configuring with -DQT_DEBUG_FIND_PACKAGE=ON will print the values of some
  of the path variables that find_package uses to try and find the package.



-- Configuring incomplete, errors occurred!

[Biswa96]

That workaround succeeded in my phone. Did you delete the build directory before trying it again?

-- Found OpenGL: /data/data/com.termux/files/usr/lib/libOpenGL.so

[uvguy]

yeah i delete the build folder after applying cmake changes

[uvguy]

sorry for late reply, I solved this by installing mesa-zink (for libopengl dimensity phone ) and mesa-zink-dev

[robertkirkman]

Try to change the set(__qt_platform_requires_host_info_package "TRUE") to FALSE in Qt6Dependencies.cmake.

Is this fixed by

• fix(x11/qt6-qtbase): only send the opt/qt6/cross QT_HOST_PATH to cross-compilations of revdeps, not on-device builds #24976

?