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  1. Qt
  2. QTBUG-85067

Building repos / tests outside of qtbase fails when using the boot2qt sdk

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      Description

      If you try to build standalone tests of qtbase, or just qtsvg targeting armv7 using the boot2qt 2.7.2 SDK, it fails at cmake configure time with the following error:

      ../qtbase_built_developer_armv7/bin/qt-cmake-private ../qtsvg
      -- The CXX compiler identification is GNU 8.3.0
      -- The C compiler identification is GNU 8.3.0
      -- Check for working CXX compiler: /opt/b2qt/2.7.2/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-g++
      -- Check for working CXX compiler: /opt/b2qt/2.7.2/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-g++ - broken
      CMake Error at /home/alex/Dev/cmakes/src/Modules/CMakeTestCXXCompiler.cmake:53 (message):
        The C++ compiler
      
          "/opt/b2qt/2.7.2/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-g++"
      
        is not able to compile a simple test program.
      
        It fails with the following output:
      
          Change Dir: /home/alex/Dev/qt/qt5_cmake/qtsvg_built_developer_armv7/CMakeFiles/CMakeTmp
      
          Run Build Command(s):/opt/b2qt/2.7.2/sysroots/x86_64-pokysdk-linux/usr/bin/ninja cmTC_a2ec2 && [1/2] Building CXX object CMakeFiles/cmTC_a2ec2.dir/testCXXCompiler.cxx.o
          [2/2] Linking CXX executable cmTC_a2ec2
          FAILED: cmTC_a2ec2
          : && /opt/b2qt/2.7.2/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-g++ --sysroot=/opt/b2qt/2.7.2/sysroots/armv7at2hf-neon-poky-linux-gnueabi -O2 -pipe -g -feliminate-unused-debug-types -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed CMakeFiles/cmTC_a2ec2.dir/testCXXCompiler.cxx.o -o cmTC_a2ec2   && :
          /opt/b2qt/2.7.2/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/8.3.0/ld: error: cmTC_a2ec2 uses VFP register arguments, CMakeFiles/cmTC_a2ec2.dir/testCXXCompiler.cxx.o does not
          /opt/b2qt/2.7.2/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/8.3.0/ld: failed to merge target specific data of file CMakeFiles/cmTC_a2ec2.dir/testCXXCompiler.cxx.o
          collect2: error: ld returned 1 exit status
          ninja: build stopped: subcommand failed.
      
        CMake will not be able to correctly generate this project.
      Call Stack (most recent call first):
        CMakeLists.txt:5 (project)
      

      The issue is that the boot2qt sdk cmake toolchain file has the piece of code:

      $ cat /opt/b2qt/2.7.2/sysroots/x86_64-pokysdk-linux/usr/share/cmake/OEToolchainConfig.cmake
      # ....
      # Include the toolchain configuration subscripts
      file( GLOB toolchain_config_files "${CMAKE_TOOLCHAIN_FILE}.d/*.cmake" )
      foreach(config ${toolchain_config_files})
          include(${config})
      endforeach()
      

      It wants to load additional files (like qemuarmv7.cmake) which sets various compile and link flags.

      This fails for us because CMAKE_TOOLCHAIN_FILE is not the path for "OEToolchainConfig.cmake" but rather the qt toolchain that we generate which chain loads "OEToolchainConfig.cmake".

      CMAKE_TOOLCHAIN_FILE thus evaluates to "qt.toolchain.cmake" and none of the sdk specific files like qemuarmv7.cmake are loaded, causing a failure to compile even a simple cmake app.

      The proper way would be to fix the code to use CMAKE_CURRENT_LIST_FILE instead, push that upstream, create a new boot2qt sdk, provision it in our VMs, and use that.
      Last provisioning of b2qt was done in https://codereview.qt-project.org/c/qt/qt5/+/286213

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              Assignee:
              alexandru.croitor Alexandru Croitor
              Reporter:
              alexandru.croitor Alexandru Croitor
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                Created:
                Updated:
                Resolved:

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