Qt6 cross compile for imx6 with Wayland support
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Hi all,
I am trying to cross compile Qt6 for the imx6 target with the Wayland support.
In the imx6 sysroot I have the wayland includes just as the libraries needed to achieve the task but when I trigger the configuration stage with cmake I get such wired error for what it concerns wayland:Configuring submodule 'qtwayland'
-- Could NOT find Qt6WaylandScannerTools (missing: Qt6WaylandScannerTools_DIR)
CMake Error at qtbase/cmake/QtToolHelpers.cmake:170 (message):
The tool "Qt6::qtwaylandscanner" was not found in the
Qt6WaylandScannerTools package. Package found: 0
Call Stack (most recent call first):
qtwayland/src/qtwaylandscanner/CMakeLists.txt:8 (qt_internal_add_tool)The cmake build configuration is arranged as follows:
cmake -B buildQt6_ARM . -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=/home/michal/toolchains/armxl2-toolchain.cmake -DCMAKE_INSTALL_PREFIX=/opt/Qt6_ARM -DCMAKE_STAGING_PREFIX=/opt/Qt6_ARM -DQT_HOST_PATH=/opt/Qt6 -DQT_QMAKE_TARGET_MKSPEC=integrity-armv7-imx6 -DQT_BUILD_EXAMPLES=FALSE -DQT_BUILD_TESTS=FALSE -DCMAKE_INTERPROCEDURAL_OPTIMIZATION_RELEASE=ON -DBUILD_qtwayland=ON -DBUILD_WITH_PCH=OFF -DINPUT_reduce_exports=yes -DINPUT_optimize_size=yes -DBUILD_qtdoc=OFF -DBUILD_qtwebengine=OFF -DBUILD_qtwebview=OFF -DBUILD_qtmultimedia=OFFThank you in advance for any help.
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Guys I can partially understand that maintaining the whole Qt framework is really a hard task but it is unthinkable at the same time that a develope should go through all the cmake rules to understand why a fancy Qt6WaylandScannerTools module is trying to use vulkan when vulkan is absent.
From what I ve seen the CMakeOutput.log shows that the wayland tests are using the egl API while for some obscure reason there is one test that is trying to use vulkan during the Qt6WaylandScannerTools module processing.
You can imagine how much joy a developer can feel especially when he has to deal with deadlines and the whole work still to be done. -
Just to recap - this is the error stated into the CMakeError.log:
/home/michal/work/armxl-buildroot/output_imx6_rootfs/host/bin/arm-buildroot-linux-gnueabihf-g++ --sysroot=/home/michal/work/armxl-buildroot/output_imx6_rootfs/host/arm-buildroot-linux-gnueabihf/sysroot -DHAVE_vulkan_server_buffer -march=armv7-a -mfpu=neon -mfloat-abi=hard -fPIE -std=gnu++17 -o CMakeFiles/cmTC_e567f.dir/src.cxx.o -c /home/michal/Downloads/qt-everywhere-src-6.3.1/buildQt6_ARM/CMakeFiles/CMakeTmp/src.cxx
/home/michal/Downloads/qt-everywhere-src-6.3.1/buildQt6_ARM/CMakeFiles/CMakeTmp/src.cxx:2:10: fatal error: vulkan/vulkan.h: No such file or directory
#include <vulkan/vulkan.h>
^~~~~~~~~~~~~~~~~
compilation terminated.
ninja: build stopped: subcommand failed.Source file was:
#define VK_USE_PLATFORM_WAYLAND_KHR 1
#include <vulkan/vulkan.h>int main(int argc, char *argv)
{
(void)argc; (void)argv;
/ BEGIN TEST: /
VkExportMemoryAllocateInfoKHR exportAllocInfo = {};
exportAllocInfo.sType = VK_STRUCTURE_TYPE_EXPORT_MEMORY_ALLOCATE_INFO_KHR;
exportAllocInfo.handleTypes = VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT_KHR;
return 0;
/ END TEST: */
return 0;
}Even by passing the the feature flag -DFEATURE_wayland_vulkan_server_buffer=OFF
the build configuration is trying to pick up vulkan API. -
This is the resolution:
Building Qt6 for the x86_64 target (host machine)
The dependencies to be installed first:
sudo apt install libxi-dev
sudo apt install libxkbcommon-x11-dev
sudo apt install libx11-xcb-dev
sudo apt install libxcb-glx0-dev
sudo apt install libxcbutil-icccm
sudo apt install libxcbutil
sudo apt install libxcb-devel
sudo apt install libxcb-dev
sudo apt install libfontconfig1-dev libfreetype6-dev libx11-dev libx11-xcb-dev libxext-dev libxfixes-dev libxi-dev libxrender-dev libxcb1-dev libxcb-glx0-dev libxcb-keysyms1-dev libxcb-image0-dev libxcb-shm0-dev libxcb-icccm4-dev libxcb-sync0-dev libxcb-xfixes0-dev libxcb-shape0-dev libxcb-randr0-dev libxcb-render-util0-dev libxkbcommon-dev libxkbcommon-x11-dev libxcb-xinerama0-dev
sudo apt install libxcb-icccm4-devsudo apt install vulkan-utils -or- sudo apt install vulkan-tools
sudo apt install vulkan-headers -or- sudo apt install libvulkan-dev
sudo apt install libvulkan1 mesa-vulkan-drivers
sudo apt install libnvidia-egl-wayland-dev #for nvidia proprietary adapters
sudo apt install libnvidia-egl-wayland-dev
sudo apt install libwayland-*The cmake command that should be issued (with few minor exceptions) is:
cmake -B buildQt6 . -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/opt/Qt6 -DCMAKE_STAGING_PREFIX=/opt/Qt6 -DQT_BUILD_TESTS=FALSE -DQT_BUILD_EXAMPLES=FALSE -DBUILD_qtwebengine=OFF -DBUILD_qtwayland=ON
Then we should issue at fist the compilation and then the install cmake commands:cd buildQt6
cmake --build . --parallel
*** it will take eons ***
sudo cmake --install .
Building Qt6 for the imx6 targetThe cmake command that should be issued (with few minor exceptions) is:
cmake -B buildQt6_ARM . -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=/path-to/armxl2-toolchain.cmake -DCMAKE_INSTALL_PREFIX=/opt/Qt6_ARM -DCMAKE_STAGING_PREFIX=/opt/Qt6_ARM -DQT_HOST_PATH=/opt/Qt6 -DQT_QMAKE_TARGET_MKSPEC=devices/linux-imx6-g++ -DBUILD_qtwayland=ON -DQT_BUILD_EXAMPLES=FALSE -DQT_BUILD_TESTS=FALSE -DCMAKE_INTERPROCEDURAL_OPTIMIZATION_RELEASE=ON -DBUILD_WITH_PCH=OFF -DINPUT_reduce_exports=yes -DINPUT_optimize_size=yes -DBUILD_qtdoc=OFF -DBUILD_qtwebengine=OFF -DBUILD_qtwebview=OFF -DBUILD_qtmultimedia=OFF -DFEATURE_xcb=OFF -DQT_FEATURE_brotli=OFF -DQT_FEATURE_hunspell=OFF
Then just as it has been done for the x86_64 target:cd buildQt6_ARM
cmake --build . --parallel
*** it will take eons ***
sudo cmake --install .The armxl2-toolchain.cmake file:
cmake_minimum_required(VERSION 3.15)
include_guard(GLOBAL)set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)set(TARGET_SYSROOT /path-to-imx6-sysroot)
set(CROSS_COMPILER /path-to/arm-linux-gnueabihf-)set(CMAKE_SYSROOT ${TARGET_SYSROOT})
set(CMAKE_C_COMPILER ${CROSS_COMPILER}gcc)
set(CMAKE_CXX_COMPILER ${CROSS_COMPILER}g++)set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY) -
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