Qt 6.9.3/6.10.0: Compile source for iOS-Simulator failes

[TheoSys]

Hi,

because the plugin QDarwinCameraPermissionPlugin_init.cpp.o is build for iOS only, my app fails linking if it was compiled for iOS-Simulator. The only solution I found so far is to recompile the source for iOS-Simulator. When I try this I get at least the following error which I can't solve:

ERROR: detected a std::atomic implementation that fails for function pointers.

CMake Error at qtbase/cmake/QtBuildInformation.cmake:240 (message):
  Check the configuration messages for an error that has occurred.
Call Stack (most recent call first):
  qtbase/cmake/QtBuildInformation.cmake:59 (qt_configure_print_summary)
  qtbase/cmake/QtBaseTopLevelHelpers.cmake:97 (qt_print_feature_summary)
  qtbase/cmake/QtBaseTopLevelHelpers.cmake:76 (qt_internal_print_top_level_info)
  CMakeLists.txt:124 (qt_internal_top_level_end)


-- Configuring incomplete, errors occurred!
CMake Error at qtbase/cmake/QtProcessConfigureArgs.cmake:1171 (message):
  CMake exited with code 1.


CMake Error at cmake/QtIRProcessHelpers.cmake:173 (message):
  /opt/Qt/6.9.3/Src/qtbase/configure -top-level
  LLVM_INSTALL_DIR=/opt/homebrew/opt/llvm FEATURE_clang=ON
  FEATURE_clangcpp=ON -no-opengl -platform macx-ios-clang -debug
  -qt-host-path /opt/Qt/6.9.3/macos -sdk iphonesimulator --
  -DCMAKE_C_COMPILER=/opt/homebrew/opt/llvm/bin/clang
  -DCMAKE_CXX_COMPILER=/opt/homebrew/opt/llvm/bin/clang++
  -DCMAKE_APPLE_ARCH_SYSROOTS=iphonesimulator -DQT_OSX_ARCHITECTURES=arm64
  -DCMAKE_OSX_ARCHITECTURES=arm64
  -DQt6OpcUaTools_DIR=/opt/Qt/6.9.3/Src/qtbase/lib/cmake/Qt6OpcUaTools
  -DCMAKE_THREAD_LIBS_INIT=-lpthread -DCMAKE_HAVE_THREADS_LIBRARY=1
  -DCMAKE_USE_WIN32_THREADS_INIT=0 -DCMAKE_USE_PTHREADS_INIT=1
  -DTHREADS_PREFER_PTHREAD_FLAG=ON exited with status: 1

Call Stack (most recent call first):
  cmake/QtTopLevelHelpers.cmake:35 (qt_ir_execute_process_and_log_and_handle_error)
  cmake/QtTopLevelHelpers.cmake:57 (qt_tl_run_toplevel_configure)
  cmake/QtTopLevelConfigureScript.cmake:16 (qt_tl_run_main_script)

I tried already with the native CLang compiler from Apple, but got the same error. Then I tried with the one in homebrew and the problem is the same. Does anybody know a way to fix this? Is there a way around it?

I'm on a Mac Mini with Apple silicon (M1). The OS version is 26.

Alternatively, if someone has the file QDarwinCameraPermissionPlugin_init.cpp.o already compiled for architecture arm64 and iOS-Simulator I would be glad if you can share this file.

A.T.

[TheoSys]

I must reply to my own question. In the mean time I found the problem. I defined the parameter:

-DCMAKE_APPLE_ARCH_SYSROOTS=iphonesimulator

This is wrong because it must be a path to the SDK root. After removing this parameter configure succeeded and it compiled as expected.

A.T.