wasm-ld: error: duplicate symbol from libqt6core

Kyef

I am getting an error regarding duplicate symbols. My search indicates libqt6core.a is being included in two or more different places and therefore wasm-ld fails to link the library as symbols are defined in multiple times. I cannot locate where this library/symbols are included but the problem arise when I include Sql required component and Qt6::Network target_link_libraries in cmake. Below is the Compilation output from the linking stage. Whoever picks interest in this can help:

[26/26 0.9/sec] Linking CXX executable Debug\appdemoApp.js
FAILED: Debug/appdemoApp.js 
cmd.exe /C "cd . && C:\Qt\emsdk\upstream\emscripten\em++.bat -DQT_QML_DEBUG -g -s MODULARIZE=1 -s EXPORT_NAME=appdemoApp_entry -s EXPORTED_RUNTIME_METHODS=UTF16ToString,stringToUTF16,JSEvents,specialHTMLTargets,FS,callMain -s INITIAL_MEMORY=50MB -s MAXIMUM_MEMORY=4GB -s MAX_WEBGL_VERSION=2 -s WASM_BIGINT=1 -s STACK_SIZE=5MB -s ALLOW_MEMORY_GROWTH --profiling-funcs -sERROR_ON_UNDEFINED_SYMBOLS=1 -sFETCH -sLINKABLE=1 -sEXPORT_ALL=1 -sSHARED_MEMORY=0 @CMakeFiles\appdemoApp.Debug.rsp -o Debug\appdemoApp.js  && cmd.exe /C "cd /D D:\Qt\Projects\build-demoApp-WebAssembly_Qt_6_9_1_single_threaded && C:\Qt\Tools\CMake_64\bin\cmake.exe -E copy_if_different D:/Qt/Projects/build-demoApp-WebAssembly_Qt_6_9_1_single_threaded/appdemoApp.html D:/Qt/Projects/build-demoApp-WebAssembly_Qt_6_9_1_single_threaded/Debug/appdemoApp.html && cd /D D:\Qt\Projects\build-demoApp-WebAssembly_Qt_6_9_1_single_threaded && C:\Qt\Tools\CMake_64\bin\cmake.exe -E copy_if_different C:/Qt/6.9.1/wasm_singlethread/plugins/platforms/qtloader.js D:/Qt/Projects/build-demoApp-WebAssembly_Qt_6_9_1_single_threaded/Debug/qtloader.js && cd /D D:\Qt\Projects\build-demoApp-WebAssembly_Qt_6_9_1_single_threaded && C:\Qt\Tools\CMake_64\bin\cmake.exe -E copy_if_different C:/Qt/6.9.1/wasm_singlethread/plugins/platforms/qtlogo.svg D:/Qt/Projects/build-demoApp-WebAssembly_Qt_6_9_1_single_threaded/Debug/qtlogo.svg""
wasm-ld: error: duplicate symbol: qDetectCpuFeatures
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qsimd.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qsimd.cpp.o)

wasm-ld: error: duplicate symbol: qt_cpu_features
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qsimd.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qsimd.cpp.o)

wasm-ld: error: duplicate symbol: qDumpCPUFeatures()
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qsimd.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qsimd.cpp.o)

wasm-ld: error: duplicate symbol: qHashBits(void const*, unsigned long, unsigned long)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: qHash(QByteArrayView, unsigned long)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: qHash(QStringView, unsigned long)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: qHash(QBitArray const&, unsigned long)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: qHash(QLatin1String, unsigned long)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: QHashSeed::globalSeed()
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: QHashSeed::setDeterministicGlobalSeed()
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: QHashSeed::resetRandomGlobalSeed()
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: qGlobalQHashSeed()
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: qSetGlobalQHashSeed(int)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: qt_hash(QStringView, unsigned int)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: qHash(double, unsigned long)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: qHash(long double, unsigned long)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(qhash.cpp.o)

wasm-ld: error: duplicate symbol: QByteArray::isNull() const
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(removed_api.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(removed_api.cpp.o)

wasm-ld: error: duplicate symbol: QByteArray::indexOf(char, int) const
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(removed_api.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(removed_api.cpp.o)

wasm-ld: error: duplicate symbol: QByteArray::lastIndexOf(char, int) const
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(removed_api.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(removed_api.cpp.o)

wasm-ld: error: duplicate symbol: QDataStream::status() const
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(removed_api.cpp.o)
>>> defined in C:/Qt/6.9.1/wasm_singlethread/lib/libQt6Core.a(removed_api.cpp.o)

wasm-ld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors)
em++: error: 'C:/Qt/emsdk/upstream/bin\wasm-ld.exe @C

Thank you in advance

jsulm

@Kyef How does your CMakeLists.txt file look like?

Kyef

Thank you @jsulm for the response. Here is my CMakeLists.txt below:

CMakeLists.txt
cmake_minimum_required(VERSION 3.16)

project(demoApp VERSION 0.1 LANGUAGES CXX)

set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_AUTOMOC ON)
set(QT_QML_GENERATE_QMLLS_INI ON)
find_package(Qt6 6.4 REQUIRED COMPONENTS
    Quick
    Network
    Sql
    WebSockets
)
# find_package(MySQL REQUIRED)
qt_standard_project_setup(REQUIRES 6.4)
qt_policy(SET QTP0001 NEW)

qt_add_executable(appdemoApp
    main.cpp
)
qt_add_qml_module(appdemoApp
    URI demoApp
    VERSION 1.0
    RESOURCE_PREFIX /

    SOURCES
    mainworker.h mainworker.cpp
    applogger.h applogger.cpp

    icons/Resource.qrc
    QML_FILES
        Main.qml
        Login.qml
        Userreg.qml
)

# Qt for iOS sets MACOSX_BUNDLE_GUI_IDENTIFIER automatically since Qt 6.1.
# If you are developing for iOS or macOS you should consider setting an
# explicit, fixed bundle identifier manually though.
set_target_properties(appdemoApp PROPERTIES
#    MACOSX_BUNDLE_GUI_IDENTIFIER com.example.appdemoApp
    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
    MACOSX_BUNDLE TRUE
    WIN32_EXECUTABLE TRUE
)

target_link_libraries(appdemoApp
    PRIVATE Qt6::Quick
    PRIVATE Qt6::Network
    PRIVATE Qt6::Sql
    PRIVATE Qt6::WebSockets
)

include(GNUInstallDirs)


install(TARGETS appdemoApp
    BUNDLE DESTINATION .
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
)

I was thinking I could be linking to a wrong library and mysql include directory however, Cmake runs the configurations very well and indicated MYSQL:MYSQL is found.