Platform linker doesn't support erroring upon encountering undefined symbols. Target:"Core".

[rnayabed]

I am trying to cross compile Qt 6.5.0 for Raspberry Pi 0 W (armv6). I followed this wiki guide and changed it to use a armv6 cross compiler.

toolchain file: (pi-0w-toolchain.cmake)

include_guard(GLOBAL)

set(CMAKE_VERBOSE_MAKEFILE ON)
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)

set(tools $ENV{HOME}/qt/toolchain/cross-pi-gcc-10.3.0-0/) # warning change toolchain path here.
set(TARGET_SYSROOT $ENV{HOME}/rpi/sysroot/)

set(rootfs_dir ${TARGET_SYSROOT})

set(CMAKE_FIND_ROOT_PATH ${rootfs_dir})
set(CMAKE_SYSROOT ${rootfs_dir})

set(ENV{PKG_CONFIG_PATH} $PKG_CONFIG_PATH:${TARGET_SYSROOT}/usr/lib/arm-linux-gnueabihf/pkgconfig)
set(ENV{PKG_CONFIG_LIBDIR} ${TARGET_SYSROOT}/usr/lib/pkgconfig:${TARGET_SYSROOT}/usr/share/pkgconfig/:${TARGET_SYSROOT}/usr/lib/arm-linux-gnueabihf/pkgconfig:${TARGET_SYSROOT}/usr/lib/pkgconfig)
set(ENV{PKG_CONFIG_SYSROOT_DIR} ${CMAKE_SYSROOT})

set(ENV{PKG_CONFIG_PATH} $PKG_CONFIG_PATH:/usr/lib/arm-linux-gnueabihf/pkgconfig)
set(ENV{PKG_CONFIG_LIBDIR} /usr/lib/pkgconfig:/usr/share/pkgconfig/:${TARGET_SYSROOT}/usr/lib/arm-linux-gnueabihf/pkgconfig:${TARGET_SYSROOT}/usr/lib/pkgconfig)
set(ENV{PKG_CONFIG_SYSROOT_DIR} ${TARGET_SYSROOT})

# if you use other version of gcc and g++ than gcc/g++ 9, you must change the following variables
SET(BIN_PREFIX ${tools}/bin/arm-linux-gnueabihf)

SET (CMAKE_C_COMPILER ${BIN_PREFIX}-gcc)
SET (CMAKE_CXX_COMPILER ${BIN_PREFIX}-g++ )
SET (CMAKE_LINKER ${BIN_PREFIX}-ld 
            CACHE STRING "Set the cross-compiler tool LD" FORCE)
SET (CMAKE_AR ${BIN_PREFIX}-ar 
            CACHE STRING "Set the cross-compiler tool AR" FORCE)
SET (CMAKE_NM {BIN_PREFIX}-nm 
            CACHE STRING "Set the cross-compiler tool NM" FORCE)
SET (CMAKE_OBJCOPY ${BIN_PREFIX}-objcopy 
            CACHE STRING "Set the cross-compiler tool OBJCOPY" FORCE)
SET (CMAKE_OBJDUMP ${BIN_PREFIX}-objdump 
            CACHE STRING "Set the cross-compiler tool OBJDUMP" FORCE)
SET (CMAKE_RANLIB ${BIN_PREFIX}-ranlib 
            CACHE STRING "Set the cross-compiler tool RANLIB" FORCE)
SET (CMAKE_STRIP {BIN_PREFIX}-strip 
            CACHE STRING "Set the cross-compiler tool RANLIB" FORCE)
            
set(CMAKE_LIBRARY_ARCHITECTURE arm-linux-gnueabihf)
# -fPIC
# --unresolved-symbols=ignore-in-shared-libs

set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-rpath-link,${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE} -L${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE}")
set(CMAKE_C_FLAGS "${CMAKE_CXX_FLAGS} --sysroot=${CMAKE_SYSROOT} -Wl,--unresolved-symbols=ignore-all -Wl,-rpath-link,${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE} -L${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE} -I${tools}/arm-linux-gnueabihf/include/c++/10.3.1 -L${tools}/arm-linux-gnueabihf/lib -L${tools}/lib/gcc/arm-linux-gnueabihf/10.3.1 -L/home/rnayabed/qt/toolchain/cross-pi-gcc-10.3.0-0/arm-linux-gnueabihf/libc/usr/lib")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --sysroot=${CMAKE_SYSROOT} -Wl,--unresolved-symbols=ignore-all -Wl,-rpath-link,${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE} -L${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE} -I${tools}/arm-linux-gnueabihf/include/c++/10.3.1 -L${tools}/arm-linux-gnueabihf/lib -L${tools}/lib/gcc/arm-linux-gnueabihf/10.3.1 -L/home/rnayabed/qt/toolchain/cross-pi-gcc-10.3.0-0/arm-linux-gnueabihf/libc/usr/lib")

set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --sysroot=${CMAKE_SYSROOT} -Wl,--unresolved-symbols=ignore-all -Wl,-rpath-link,${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE} -L${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE}")
set(CMAKE_C_FLAGS "${CMAKE_CXX_FLAGS} --sysroot=${CMAKE_SYSROOT} -Wl,--unresolved-symbols=ignore-all -Wl,-rpath-link,${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE} -L${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE} -I${tools}/arm-linux-gnueabihf/include/c++/10.3.1 -L${tools}/arm-linux-gnueabihf/lib -L${tools}/lib/gcc/arm-linux-gnueabihf/10.3.1 -L/home/rnayabed/qt/toolchain/cross-pi-gcc-10.3.0-0/arm-linux-gnueabihf/libc/usr/lib")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --sysroot=${CMAKE_SYSROOT} -Wl,--unresolved-symbols=ignore-all -Wl,-rpath-link,${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE} -L${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE} -I${tools}/arm-linux-gnueabihf/include/c++/10.3.1 -L${tools}/arm-linux-gnueabihf/lib -L${tools}/lib/gcc/arm-linux-gnueabihf/10.3.1 -L/home/rnayabed/qt/toolchain/cross-pi-gcc-10.3.0-0/arm-linux-gnueabihf/libc/usr/lib")

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -I${TARGET_SYSROOT}/usr/include")
set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS}")


#[[set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --sysroot=${CMAKE_SYSROOT} -I${TARGET_SYSROOT}/usr/include -I${TARGET_SYSROOT}/usr/include/${CMAKE_LIBRARY_ARCHITECTURE} -L${CMAKE_SYSROOT}/usr/lib -L${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE}")

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --sysroot=${CMAKE_SYSROOT} -I${TARGET_SYSROOT}/usr/include -I${TARGET_SYSROOT}/usr/include/${CMAKE_LIBRARY_ARCHITECTURE} -L${CMAKE_SYSROOT}/usr/lib -L${CMAKE_SYSROOT}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE}")
set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_CXX_FLAGS}")]]

set(QT_COMPILER_FLAGS "-march=armv6kz")
set(QT_COMPILER_FLAGS_RELEASE "-O2 -pipe")
set(QT_LINKER_FLAGS "-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed")

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)
set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
set(CMAKE_BUILD_RPATH ${TARGET_SYSROOT})


include(CMakeInitializeConfigs)

function(cmake_initialize_per_config_variable _PREFIX _DOCSTRING)
  if (_PREFIX MATCHES "CMAKE_(C|CXX|ASM)_FLAGS")
    set(CMAKE_${CMAKE_MATCH_1}_FLAGS_INIT "${QT_COMPILER_FLAGS}")
        
    foreach (config DEBUG RELEASE MINSIZEREL RELWITHDEBINFO)
      if (DEFINED QT_COMPILER_FLAGS_${config})
        set(CMAKE_${CMAKE_MATCH_1}_FLAGS_${config}_INIT "${QT_COMPILER_FLAGS_${config}}")
      endif()
    endforeach()
  endif()


  if (_PREFIX MATCHES "CMAKE_(SHARED|MODULE|EXE)_LINKER_FLAGS")
    foreach (config SHARED MODULE EXE)
      set(CMAKE_${config}_LINKER_FLAGS_INIT "${QT_LINKER_FLAGS}")
    endforeach()
  endif()

  _cmake_initialize_per_config_variable(${ARGV})
endfunction()

set(XCB_PATH_VARIABLE ${TARGET_SYSROOT})

set(GL_INC_DIR ${TARGET_SYSROOT}/usr/include)
set(GL_LIB_DIR ${TARGET_SYSROOT}:${TARGET_SYSROOT}/usr/lib/arm-linux-gnueabihf/:${TARGET_SYSROOT}/usr:${TARGET_SYSROOT}/usr/lib)

set(EGL_INCLUDE_DIR ${GL_INC_DIR})
set(EGL_LIBRARY ${XCB_PATH_VARIABLE}/usr/lib/arm-linux-gnueabihf/libEGL.so)

set(OPENGL_INCLUDE_DIR ${GL_INC_DIR})
set(OPENGL_opengl_LIBRARY ${XCB_PATH_VARIABLE}/usr/lib/arm-linux-gnueabihf/libOpenGL.so)

set(GLESv2_INCLUDE_DIR ${GL_INC_DIR})
set(GLIB_LIBRARY ${XCB_PATH_VARIABLE}/usr/lib/arm-linux-gnueabihf/libGLESv2.so)

set(GLESv2_INCLUDE_DIR ${GL_INC_DIR})
set(GLESv2_LIBRARY ${XCB_PATH_VARIABLE}/usr/lib/arm-linux-gnueabihf/libGLESv2.so)

set(gbm_INCLUDE_DIR ${GL_INC_DIR})
set(gbm_LIBRARY ${XCB_PATH_VARIABLE}/usr/lib/arm-linux-gnueabihf/libgbm.so)

set(Libdrm_INCLUDE_DIR ${GL_INC_DIR})
set(Libdrm_LIBRARY ${XCB_PATH_VARIABLE}/usr/lib/arm-linux-gnueabihf/libdrm.so)

set(XCB_XCB_INCLUDE_DIR ${GL_INC_DIR})
set(XCB_XCB_LIBRARY ${XCB_PATH_VARIABLE}/usr/lib/arm-linux-gnueabihf/libxcb.so)

Output:

-- Performing Test HAVE_xcb_syslibs - Failed
-- Performing Test HAVE_libinput_hires_wheel_support
-- Performing Test HAVE_libinput_hires_wheel_support - Failed
-- Performing Test HAVE_directwrite
-- Performing Test HAVE_directwrite - Failed
-- Performing Test HAVE_directwrite3
-- Performing Test HAVE_directwrite3 - Failed
-- Performing Test HAVE_d2d1
-- Performing Test HAVE_d2d1 - Failed
-- Performing Test HAVE_d2d1_1
-- Performing Test HAVE_d2d1_1 - Failed
CMake Error at qtbase/cmake/QtBuildInformation.cmake:508 (message):
  Feature "opengl": Forcing to "ON" breaks its condition:

      QT_FEATURE_opengl_desktop OR QT_FEATURE_opengl_dynamic OR QT_FEATURE_opengles2

  Condition values dump:

      QT_FEATURE_opengl_desktop = "OFF"
      QT_FEATURE_opengl_dynamic = "OFF"
      QT_FEATURE_opengles2 = "OFF"

Call Stack (most recent call first):
  qtbase/cmake/QtFeature.cmake:288 (qt_configure_add_report_error)
  qtbase/cmake/QtFeature.cmake:410 (qt_feature_check_and_save_internal_value)
  qtbase/cmake/QtFeature.cmake:625 (qt_evaluate_feature)
  qtbase/cmake/QtFeature.cmake:594 (qt_feature_module_end)
  qtbase/src/CMakeLists.txt:13 (qt_feature_evaluate_features)


-- Searching for tool 'Qt6::syncqt' in package Qt6CoreTools.
-- Qt6::syncqt was found at /home/rnayabed/qt/host/./libexec/syncqt using package Qt6CoreTools.
-- Tool 'Qt6::moc' was found at /home/rnayabed/qt/host/./libexec/moc.
-- Tool 'Qt6::rcc' was found at /home/rnayabed/qt/host/./libexec/rcc.
-- Tool 'Qt6::tracepointgen' was found at /home/rnayabed/qt/host/./libexec/tracepointgen.
-- Tool 'Qt6::tracegen' was found at /home/rnayabed/qt/host/./libexec/tracegen.
-- Tool 'Qt6::cmake_automoc_parser' was found at /home/rnayabed/qt/host/./libexec/cmake_automoc_parser.
-- Looking for pthread.h
-- Looking for pthread.h - not found
-- Could NOT find Threads (missing: Threads_FOUND) 
-- Using system PCRE2.
-- Found WrapPCRE2: TRUE  
-- Using system ZLIB.
-- Found WrapZLIB: TRUE  
-- Could NOT find Backtrace (missing: Backtrace_LIBRARY) 
-- Could NOT find WrapSystemDoubleConversion (missing: DOUBLE_CONVERSION_LIBRARY DOUBLE_CONVERSION_INCLUDE_DIR __double_conversion_found) 
-- Found GLIB2: /home/rnayabed/rpi/sysroot/usr/lib/arm-linux-gnueabihf/libglib-2.0.so   
-- Found the following ICU libraries:
--   i18n (required)
--   uc (required)
--   data (required)
-- Checking for module 'libsystemd'
--   Found libsystemd, version 247
-- Checking for module 'libb2'
--   No package 'libb2' found
-- Could NOT find WrapRt (missing: WrapRt_FOUND) 
-- Could NOT find Slog2 (missing: Slog2_INCLUDE_DIR Slog2_LIBRARY) 
-- Performing Test HAVE_DASH_UNDEFINED_SYMBOLS
-- Performing Test HAVE_DASH_UNDEFINED_SYMBOLS - Failed
-- Performing Test HAVE_DASH_DASH_NO_UNDEFINED
-- Performing Test HAVE_DASH_DASH_NO_UNDEFINED - Failed
CMake Error at qtbase/cmake/QtFlagHandlingHelpers.cmake:111 (message):
  Platform linker doesn't support erroring upon encountering undefined
  symbols.  Target:"Core".
Call Stack (most recent call first):
  qtbase/cmake/QtModuleHelpers.cmake:796 (qt_internal_add_link_flags_no_undefined)
  qtbase/src/corelib/CMakeLists.txt:40 (qt_internal_add_module)


-- Configuring incomplete, errors occurred!
See also "/home/rnayabed/qt/pi-0w-build/CMakeFiles/CMakeOutput.log".
See also "/home/rnayabed/qt/pi-0w-build/CMakeFiles/CMakeError.log".
CMake Error at /home/rnayabed/qt/source/qtbase/cmake/QtProcessConfigureArgs.cmake:994 (message):
  CMake exited with code 1.

[Raureth]

@rnayabed Which OS (and version) are you running ?