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Failing to build Qt 6.6.2 from source on Windows 10 with MinGW64 compiler

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  • K Offline
    K Offline
    kyrlon
    wrote on last edited by kyrlon
    #1

    I am having trouble building Qt 6.6.2 from source on my Windows 10 system following the steps provided from Qt for Windows - Building from Source. Because my internet connection is inconsistent, I cannot rely on the installer to install the Qt framework, therefore I am building from source. Although I am aware of various compilers (e.g. MSVC), I am only using MinGW in the hopes that this will be repeated in the future. My current system info are the following:

    • OS: Windows 10
    • Build Tools
      • Cmake Version: 3.29 (Installed via installer)
      • Ninja: N/A
      • Python: 3.11.8 (Installed via installer; python is added to path)
    • Compilers: ONLY MinGW64
      • Download MinGW and add to PATH: *C:\Program Files\mingw64\bin*
      • Winlibs standalone build
      • UCRT runtime
      • GCC 13.2.0 (with POSIX threads) + LLVM/Clang/LLD/LLDB 17.0.6 + MinGW-w64 11.0.1 (UCRT) - release 5

    I will walk you through the steps I took to encounter my current issue in with the system configuration mentioned above where hopefully someone can point out possible places where I might have made a mistake or run into difficulties.

    Attempt #1 for building on windows

    After configuring my Windows 10 I did the following:

    1. Downloaded the source file and extracted in Downloads folder
    2. created build directory in source folder and then cd into folder:
      C:\Users\kyrlon\Downloads\qt-everywhere-src-6.6.2\build
    3. ran the configure.bat like the following:
    PS C:\Users\kyrlon\Downloads\qt-everywhere-src-6.6.2\build> ..\configure.bat

    At step 3 is where I got my first issue with building from source with the error message stating a missing reference regarding the imported LLVMDemangle. I've added the output from Step 3 in the pastebin link with line numbers to make it easier to reference topics: https://pastebin.com/UEDRXRBA

    From the output on line 0164, it mentions that it cannot find a missing static library "C:/Program Files/mingw64/lib/libLLVMDemangle.dll.a". I could not find this file and with a quick google search this stack-overflow post was the only mention of a similar error. I am not familiar with shared libraries on Windows. Searching the folder I came across libLLVMDemangle.dll file in C:\Program Files\mingw64\bin. Still no idea what to do at this point, grudgingly I resorted to asking chatgpt on converting a .dll to a .dll.a and the response was to first generate a .def file with the gendef tool in the bin/ folder of minGW and then convert that file to a dll.a with the dlltool. I made the file that was originally stated to be missing "C:/Program Files/mingw64/lib/libLLVMDemangle.dll.a" and got more errors of missing static libraries. I ended up making a python script to convert missing static libraries from the cmake file C:/Program Files/mingw64/lib/cmake/llvm/LLVMConfig.cmake with the following commands:

    import linecache
from pathlib import Path
import subprocess, shutil

bin_dir = Path(r"C:\Program Files\mingw64\bin")
lib_dir = Path(r"C:\Program Files\mingw64\lib")
lib = linecache.getline(r"C:/Program Files/mingw64/lib/cmake/llvm/LLVMExports.cmake", 22)
lib = lib.split("ITEMS")
lib = lib[1:][0]
lib = lib.split(")")[0]
lib = lib.split()

tmp = Path(__file__).resolve().parent
tmp = tmp / "tmp"
tmp.mkdir(parents=True, exist_ok=True)

for l in lib:
    if (p:=Path(bin_dir / f"lib{l}.dll")).is_file():
        shutil.copy(p, tmp/p.name)
        cmd1 = f"gendef {str(tmp/p.name)}"
        subprocess.run(cmd1.split(), shell=True, cwd=tmp)
        cmd2 = f"dlltool -d {str(p.stem)}.def -l {str(p.stem)}.dll.a"
        subprocess.run(cmd2.split(), shell=True, cwd=tmp)
        shutil.copy(str(tmp/p.stem)+".dll.a", lib_dir)
    1. Run (AS ADMIN) the code block above to generate static libraries for cmake expected targets.

    Attempt # 2 for building on windows

    1. After generated static libraries, cleared out the build folder and ran the configure.bat like the following:
    PS C:\Users\kyrlon\Downloads\qt-everywhere-src-6.6.2\build> ..\configure.bat

    Further, but came across missing static libraries for clang C:\Program Files\mingw64\lib\cmake\clang\ClangTargets.cmake this time. In similar fashion, a python script was made to generate static libraries:

    import linecache
from pathlib import Path
import subprocess, shutil
bin_dir = Path(r"C:\Program Files\mingw64\bin")
lib_dir = Path(r"C:\Program Files\mingw64\lib")
lib = linecache.getline(r"C:\Program Files\mingw64\lib\cmake\clang\ClangTargets.cmake", 22)
lib = lib.split("ITEMS")
lib = lib[1:][0]
lib = lib.split(")")[0]
lib = lib.split()

tmp = Path(__file__).resolve().parent
tmp = tmp / "tmp_clang"
tmp.mkdir(parents=True, exist_ok=True)

for l in lib:
    if (p:=Path(bin_dir / f"lib{l}.dll")).is_file():
        shutil.copy(p, tmp/p.name)
        cmd1 = f"gendef {str(tmp/p.name)}"
        subprocess.run(cmd1.split(), shell=True, cwd=tmp)
        cmd2 = f"dlltool -d {str(p.stem)}.def -l {str(p.stem)}.dll.a"
        subprocess.run(cmd2.split(), shell=True, cwd=tmp)
        shutil.copy(str(tmp/p.stem)+".dll.a", lib_dir)
    1. Run (AS ADMIN) the code block above to generate static libraries for cmake expected targets.

    Attempt # 3 for building on windows

    1. After generated static libraries, cleared out the build folder and ran the configure.bat like the following:
    PS C:\Users\kyrlon\Downloads\qt-everywhere-src-6.6.2\build> ..\configure.bat

    This time I got an error stating that it was missing a python module html5lib.

    1. Fix python error by doing a global pip install html5lib to system.

    Attempt # 4 for building windows

    1. After generated static libraries, cleared out the build folder and ran the configure.bat like the following:
    PS C:\Users\kyrlon\Downloads\qt-everywhere-src-6.6.2\build> ..\configure.bat

    Now this is the output from the command when Configuring Done (with alot of warnings): https://pastebin.com/6BhtMFcY

    1. Run the command cmake --build . --parallel
      Now after step 3, I get an error in this output: https://pastebin.com/m5rmQp0T

    Here it states that no such file or directory for qwindowsmediadevices_p.h
    I believe that at this point, I would be changing the files that ought to have been created. If anyone has an idea on next steps to attempt, I am open for suggestions!

    cristian-adamC 1 Reply Last reply
    0
  • cristian-adamC Offline
    cristian-adamC Offline
    cristian-adam
    replied to kyrlon on last edited by
    #2

    Have a look at https://wiki.qt.io/MinGW for the MinGW toolchain used to build Qt.

    Qt uses the releases from https://github.com/niXman/mingw-builds-binaries/releases

    The winlib's MinGW is not supported. You need to ask winlib for support.

    K 1 Reply Last reply
    1
  • K kyrlon referenced this topic on
  • K Offline
    K Offline
    kyrlon
    replied to cristian-adam on last edited by kyrlon
    #3

    @cristian-adam Thanks for pointing that out. As mentioned by your comment, I was using an incompatible version of minGW. I then downloaded the compatible MinGW and added to PATH

    Attempt # 5 for building on windows

    1. Cleared out the build folder and ran the configure.bat like the following:
    PS C:\Users\kyrlon\Downloads\qt-everywhere-src-6.6.2\build> ..\configure.bat

    1. Ran the command cmake --build . --parallel
      Got a bunch of errors stating that it could not remove certain files with what it looks like mingw-32-make.exe: https://pastebin.com/N1Kctyf6

    2. Ran the command cmake --build . --parallel
      Got a bunch of errors again this time failing at 10% with just Error2: https://pastebin.com/j6hUEWeX

    Attempt # 6 for building on windows

    Decided to use ninja to see if there is any difference with a different build tool added since it was recommended, but not required. Downloaded ninja v1.11.1 and added to PATH

    1. Cleared out the build folder and ran the configure.bat like the following:
    PS C:\Users\kyrlon\Downloads\qt-everywhere-src-6.6.2\build> ..\configure.bat
    1. Ran the command cmake --build . --parallel
      Got a bunch of no outputs generated. Eventually got a FAILED:
    FAILED: qtmultimedia/src/plugins/multimedia/windows/CMakeFiles/QWindowsMediaPlugin.dir/qwindowsintegration.cpp.obj

    Here is a log output for this attempt: https://pastebin.com/sVUR1jGa
    This error is similar to Attempt #4, and I am not sure why this file would be missing.

    cristian-adamC Christian EhrlicherC 2 Replies Last reply
    0
  • cristian-adamC Offline
    cristian-adamC Offline
    cristian-adam
    replied to kyrlon on last edited by
    #4

    Qt 6.6.2 is being released with a MinGW build.

    At https://testresults.qt.io/coin/integration/qt/qtmultimedia/tasks/1707528820 I can see a qtmultimedia 6.6.2 integration.

    windows-10_22h2-mingw11 raw log has:

    agent:2024/02/10 00:14:45 build.go:795: Executing instruction 59 of 97 - ExecuteCommand
agent:2024/02/10 00:14:45 build.go:427: [\Users\qt\work\install\bin\qt-configure-module.bat \Users\qt\work\qt\qtmultimedia -- -DFFMPEG_DIR=C:\ffmpeg-n6.1\build\mingw\installed -DFEATURE_native_grpc=OFF -DCMAKE_IGNORE_PREFIX_PATH=C:/strawberry/c -DQT_BUILD_TESTS=OFF -DCMAKE_AUTOGEN_VERBOSE=ON -DCMAKE_MESSAGE_LOG_LEVEL=STATUS -DCMAKE_C_COMPILER_LAUNCHER=sccache -DCMAKE_CXX_COMPILER_LAUNCHER=sccache] 1h40m0s 20m0s false false
agent:2024/02/10 00:14:45 build.go:404: 'C:\Users\qt\work\install\bin\\qt-cmake-private.bat' '-DFFMPEG_DIR=C:\ffmpeg-n6.1\build\mingw\installed' '-DFEATURE_native_grpc=OFF' '-DCMAKE_IGNORE_PREFIX_PATH=C:/strawberry/c' '-DQT_BUILD_TESTS=OFF' '-DCMAKE_AUTOGEN_VERBOSE=ON' '-DCMAKE_MESSAGE_LOG_LEVEL=STATUS' '-DCMAKE_C_COMPILER_LAUNCHER=sccache' '-DCMAKE_CXX_COMPILER_LAUNCHER=sccache' '-DQT_INTERNAL_CALLED_FROM_CONFIGURE:BOOL=TRUE' 'C:/Users/qt/work/qt/qtmultimedia'
agent:2024/02/10 00:14:48 build.go:404: -- The CXX compiler identification is GNU 11.2.0
agent:2024/02/10 00:14:51 build.go:404: -- The C compiler identification is GNU 11.2.0
agent:2024/02/10 00:14:51 build.go:404: -- Detecting CXX compiler ABI info
agent:2024/02/10 00:14:52 build.go:404: -- Detecting CXX compiler ABI info - done
agent:2024/02/10 00:14:52 build.go:404: -- Check for working CXX compiler: C:/MINGW1120/mingw64/bin/g++.exe - skipped
agent:2024/02/10 00:14:52 build.go:404: -- Detecting CXX compile features
agent:2024/02/10 00:14:52 build.go:404: -- Detecting CXX compile features - done
agent:2024/02/10 00:14:52 build.go:404: -- Detecting C compiler ABI info
agent:2024/02/10 00:14:52 build.go:404: -- Detecting C compiler ABI info - done
agent:2024/02/10 00:14:53 build.go:404: -- Check for working C compiler: C:/MINGW1120/mingw64/bin/gcc.exe - skipped
agent:2024/02/10 00:14:53 build.go:404: -- Detecting C compile features
agent:2024/02/10 00:14:53 build.go:404: -- Detecting C compile features - done
agent:2024/02/10 00:14:53 build.go:404: -- Performing Test CMAKE_HAVE_LIBC_PTHREAD
agent:2024/02/10 00:14:53 build.go:404: -- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
agent:2024/02/10 00:14:53 build.go:404: -- Found Threads: TRUE  
agent:2024/02/10 00:14:54 build.go:404: -- Performing Test HAVE_STDATOMIC
agent:2024/02/10 00:14:54 build.go:404: -- Performing Test HAVE_STDATOMIC - Success
agent:2024/02/10 00:14:54 build.go:404: -- Found WrapAtomic: TRUE  
agent:2024/02/10 00:14:57 build.go:404: -- CMAKE_BUILD_TYPE was set to: 'RelWithDebInfo'
agent:2024/02/10 00:14:57 build.go:404: -- Checking for feature set changes
agent:2024/02/10 00:14:57 build.go:404: -- CMAKE_STRIP (original): C:/MINGW1120/mingw64/bin/strip.exe
agent:2024/02/10 00:14:57 build.go:404: -- Performing Test strip --keep-section
agent:2024/02/10 00:14:58 build.go:404: -- Performing Test strip --keep-section - TRUE
agent:2024/02/10 00:14:58 build.go:404: -- CMAKE_STRIP (used by Qt): C:/Users/qt/work/qt/qtmultimedia_build/./bin/qt-internal-strip.bat
agent:2024/02/10 00:14:58 build.go:404: -- Could NOT find ALSA (missing: ALSA_LIBRARY ALSA_INCLUDE_DIR) 
agent:2024/02/10 00:14:59 build.go:404: -- Could NOT find AVFoundation (missing: AVFoundation_LIBRARY) 
agent:2024/02/10 00:14:59 build.go:404: -- Could NOT find GLIB2 (missing: GLIB2_LIBRARIES GTHREAD2_LIBRARIES GLIB2_INCLUDE_DIRS) 
agent:2024/02/10 00:14:59 build.go:404: -- Could NOT find GLIB2 (missing: GLIB2_LIBRARIES GTHREAD2_LIBRARIES GLIB2_INCLUDE_DIRS) 
agent:2024/02/10 00:15:00 build.go:404: -- Could NOT find GLIB2 (missing: GLIB2_LIBRARIES GTHREAD2_LIBRARIES GLIB2_INCLUDE_DIRS) 
agent:2024/02/10 00:15:00 build.go:404: -- Could NOT find GLIB2 (missing: GLIB2_LIBRARIES GTHREAD2_LIBRARIES GLIB2_INCLUDE_DIRS) 
agent:2024/02/10 00:15:00 build.go:404: -- Could NOT find MMRendererCore (missing: MMRendererCore_LIBRARY) 
agent:2024/02/10 00:15:00 build.go:404: -- Could NOT find MMRenderer (missing: MMRenderer_LIBRARY) 
agent:2024/02/10 00:15:01 build.go:404: -- Could NOT find WrapPulseAudio (missing: PULSEAUDIO_LIBRARY PULSEAUDIO_INCLUDE_DIR WrapPulseAudio_FOUND) 
agent:2024/02/10 00:15:02 build.go:404: -- Found WMF: C:/MINGW1120/mingw64/x86_64-w64-mingw32/lib/libstrmiids.a  
agent:2024/02/10 00:15:02 build.go:404: -- Performing Test HAVE_EGL
agent:2024/02/10 00:15:02 build.go:404: -- Performing Test HAVE_EGL - Failed
agent:2024/02/10 00:15:02 build.go:404: -- Could NOT find EGL (missing: EGL_INCLUDE_DIR HAVE_EGL EGL_LIBRARY) 
agent:2024/02/10 00:15:03 build.go:404: -- Found FFmpeg: libavcodec.a;libavformat.a;libavutil.a;libswresample.a;libswscale.a  found components: AVCODEC AVFORMAT AVUTIL SWRESAMPLE SWSCALE 
agent:2024/02/10 00:15:03 build.go:404: -- Could NOT find VAAPI (missing: VAAPI_VA_FOUND VAAPI_DRM_FOUND VA DRM) 
agent:2024/02/10 00:15:03 build.go:404: -- Performing Test evr.h
agent:2024/02/10 00:15:06 build.go:404: -- Performing Test evr.h - Success
agent:2024/02/10 00:15:06 build.go:404: -- Performing Test Vivante GPU
agent:2024/02/10 00:15:07 build.go:404: -- Performing Test Vivante GPU - Failed
agent:2024/02/10 00:15:07 build.go:404: -- Performing Test Video for Linux
agent:2024/02/10 00:15:07 build.go:404: -- Performing Test Video for Linux - Failed
agent:2024/02/10 00:15:07 build.go:404: -- Performing Test wmsdk.h
agent:2024/02/10 00:15:10 build.go:404: -- Performing Test wmsdk.h - Success
agent:2024/02/10 00:15:10 build.go:404: -- Performing Test Linux DMA buffer support - Failed because EGL::EGL not found
agent:2024/02/10 00:15:10 build.go:404: -- Performing Test HAVE_DASH_UNDEFINED_SYMBOLS
agent:2024/02/10 00:15:11 build.go:404: -- Performing Test HAVE_DASH_UNDEFINED_SYMBOLS - Success
agent:2024/02/10 00:15:11 build.go:404: -- Performing Test HAVE_DASH_DASH_NO_UNDEFINED
agent:2024/02/10 00:15:11 build.go:404: -- Performing Test HAVE_DASH_DASH_NO_UNDEFINED - Success
agent:2024/02/10 00:15:12 build.go:404: -- Could NOT find EGL (missing: EGL_INCLUDE_DIR HAVE_EGL EGL_LIBRARY) 
agent:2024/02/10 00:15:13 build.go:404: -- Could NOT find VAAPI (missing: VAAPI_VA_FOUND VAAPI_DRM_FOUND VA DRM) 
agent:2024/02/10 00:15:13 build.go:404: -- Generated QtModulePlugins.cmake files for the following modules: Multimedia
agent:2024/02/10 00:15:13 build.go:404: -- The following packages have been found:
agent:2024/02/10 00:15:13 build.go:404:  * Qt6BuildInternals (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6CoreTools (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6Core (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Vulkan
agent:2024/02/10 00:15:13 build.go:404:  * Qt6GuiTools (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6Gui (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6Network (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6Svg (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6WidgetsTools (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6Widgets (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6QmlTools (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * WrapVulkanHeaders
agent:2024/02/10 00:15:13 build.go:404:  * Qt6Quick (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6QuickTest (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6QuickControls2 (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6Quick3DTools (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6ShaderToolsTools (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6Quick3D (required version >= 6.6.2)
agent:2024/02/10 00:15:13 build.go:404:  * Qt6
agent:2024/02/10 00:15:13 build.go:404:  * WMF
agent:2024/02/10 00:15:13 build.go:404:  * FFmpeg
agent:2024/02/10 00:15:13 build.go:404: -- The following OPTIONAL packages have not been found:
agent:2024/02/10 00:15:13 build.go:404:  * Qt6QmlCompilerPlusPrivate
agent:2024/02/10 00:15:13 build.go:404:  * ALSA
agent:2024/02/10 00:15:13 build.go:404:  * AVFoundation
agent:2024/02/10 00:15:13 build.go:404:  * GStreamer
agent:2024/02/10 00:15:13 build.go:404:  * MMRendererCore
agent:2024/02/10 00:15:13 build.go:404:  * MMRenderer
agent:2024/02/10 00:15:13 build.go:404:  * PulseAudio
agent:2024/02/10 00:15:13 build.go:404:  * WrapPulseAudio
agent:2024/02/10 00:15:13 build.go:404:  * EGL, A platform-agnostic mechanism for creating rendering surfaces for use with other graphics libraries, such as OpenGL|ES and OpenVG., <https://www.khronos.org/egl/>
agent:2024/02/10 00:15:14 build.go:404:  * PkgConfig
agent:2024/02/10 00:15:14 build.go:404:  * VAAPI
agent:2024/02/10 00:15:14 build.go:404: -- Configuration summary shown below. It has also been written to C:/Users/qt/work/qt/qtmultimedia_build/config.summary
agent:2024/02/10 00:15:14 build.go:404: -- Configure with --log-level=STATUS or higher to increase CMake's message verbosity. The log level does not persist across reconfigurations.
agent:2024/02/10 00:15:14 build.go:404:  
agent:2024/02/10 00:15:14 build.go:404: -- Configure summary:
agent:2024/02/10 00:15:14 build.go:404: Qt Multimedia:
agent:2024/02/10 00:15:14 build.go:404:   Spatial Audio .......................... yes
agent:2024/02/10 00:15:14 build.go:404:   Spatial Audio (Quick3D) ................ yes
agent:2024/02/10 00:15:14 build.go:404:   Low level Audio Backend:
agent:2024/02/10 00:15:14 build.go:404:     ALSA (experimental) .................. no
agent:2024/02/10 00:15:14 build.go:404:     PulseAudio ........................... no
agent:2024/02/10 00:15:14 build.go:404:     MMRenderer ........................... no
agent:2024/02/10 00:15:14 build.go:404:     CoreAudio ............................ no
agent:2024/02/10 00:15:14 build.go:404:     Windows Media SDK .................... yes
agent:2024/02/10 00:15:14 build.go:404:     Open SLES (Android) .................. no
agent:2024/02/10 00:15:14 build.go:404:     Web Assembly ......................... no
agent:2024/02/10 00:15:14 build.go:404:   Plugin:
agent:2024/02/10 00:15:14 build.go:404:     GStreamer 1.0 ........................ no
agent:2024/02/10 00:15:14 build.go:404:     FFmpeg ............................... yes
agent:2024/02/10 00:15:14 build.go:404:     MMRenderer ........................... no
agent:2024/02/10 00:15:14 build.go:404:     AVFoundation ......................... no
agent:2024/02/10 00:15:14 build.go:404:     Windows Media Foundation ............. yes
agent:2024/02/10 00:15:14 build.go:404:   Hardware acceleration and features:
agent:2024/02/10 00:15:14 build.go:404:     Video for Linux ...................... no
agent:2024/02/10 00:15:14 build.go:404:     VAAPI support ........................ no
agent:2024/02/10 00:15:14 build.go:404:     Linux DMA buffer support ............. no
agent:2024/02/10 00:15:14 build.go:404:     VideoToolbox ......................... no
agent:2024/02/10 00:15:14 build.go:404:

    Doing a search on Jira points to https://bugreports.qt.io/browse/QTBUG-114540 which might have information which would help.

    K 1 Reply Last reply
    0
  • K Offline
    K Offline
    kyrlon
    replied to cristian-adam on last edited by
    #5

    @cristian-adam Thanks for the response. I have not seen my error/bug so I created a new issue

    1 Reply Last reply
    1
  • Christian EhrlicherC Offline
    Christian EhrlicherC Offline
    Christian Ehrlicher Lifetime Qt Champion
    replied to kyrlon on last edited by
    #6

    @kyrlon said in Failing to build Qt 6.6.2 from source on Windows 10 with MinGW64 compiler:

    and I am not sure why this file would be missing.

    Because the path is to long. Use a shorter source and build path and blame MS.

    Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
    Visit the Qt Academy at https://academy.qt.io/catalog

    cristian-adamC 1 Reply Last reply
    1
  • cristian-adamC Offline
    cristian-adamC Offline
    cristian-adam
    replied to Christian Ehrlicher on last edited by
    #7

    @kyrlon It could be that the path is too long for the MinGW GCC.

    At https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107974 I have a bugreport with a workaround to make gcc accept long paths:

    I've used the manifest tool from Visual C++ (mt.exe) to inject this manifest:

    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!-- Copyright (c) Microsoft Corporation -->
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
<application  xmlns="urn:schemas-microsoft-com:asm.v3">
    <windowsSettings xmlns:ws2="http://schemas.microsoft.com/SMI/2016/WindowsSettings">
        <ws2:longPathAware>true</ws2:longPathAware>
    </windowsSettings>
</application>
</assembly>

    with the command line:
    mt.exe -nologo -manifest "cc1plus.exe.manifest" -outputresource:"cc1plus.exe;#1"

    Ninja requires the same treatment, see https://github.com/ninja-build/ninja/pull/2225

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    kyrlon
    replied to cristian-adam on last edited by
    #8

    @cristian-adam I am not too familiar with this. Do I run this in the minGW bin? I do not have a cc1plus.exe on my system.

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    kyrlon
    wrote on last edited by kyrlon
    #9

    Attempt # 7 for building on windows

    Decided to use ninja that had fix in it, so I compiled from source on windows and replaced with new ninja in PATH

    1. Cleared out the build folder and ran the configure.bat like the following:
    PS C:\Users\kyrlon\Downloads\qt-everywhere-src-6.6.2\build> ..\configure.bat
    1. Ran the command cmake --build . --parallel
      Got another output fail due to missing header:
    C:/Users/kyrlon/Downloads/qt-everywhere-src-6.6.2/qtmultimedia/src/multimedia/windows/qwindowsmediadevices_p.h:19:10: fatal error: qplatformmediadevices_p.h: No such file or directory
   19 | #include <qplatformmediadevices_p.h>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

    Attempt # 8 for building on windows [SUCCESS!!]

    Trying the suggestion by Christian Ehrlicher, and decided to build in the C:\ path directly, but this required a terminal with ADMIN priv.

    1. Cleared out the build folder and ran the configure.bat like the following:
    PS C:\qt6\build> ..\configure.bat
    1. Ran the command cmake --build . --parallel
      SUCCESS!
    2. Ran the command:
    PS C:\qt6\build> cmake --install .

    No issues and everything was installed.

    This attempt appears to be successful, but I'm not sure if trying to build from source every time from different machines would allow me to always have access to C:\.

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    jsulm Lifetime Qt Champion
    replied to kyrlon on last edited by
    #10

    @kyrlon said in Failing to build Qt 6.6.2 from source on Windows 10 with MinGW64 compiler:

    allow me to always have access to C:.

    You can also build in your user home folder like c:\users\USER_NAME\QT_BUILD_FOLDER

    https://forum.qt.io/topic/113070/qt-code-of-conduct

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    kyrlon
    replied to jsulm on last edited by
    #11

    @jsulm Good point. In general, I am aware that this is a Windows problem, but tampering with registry keys to disable the character path limit is not the ideal solution for different systems in use. Since I don't do much development on Windows, I was just wondering if this was a gcc or cmake limitation?

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    jsulmJ Offline
    jsulm Lifetime Qt Champion
    replied to kyrlon on last edited by
    #12

    @kyrlon Too long paths is a Windows limitation

    https://forum.qt.io/topic/113070/qt-code-of-conduct

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  • Christian EhrlicherC Offline
    Christian EhrlicherC Offline
    Christian Ehrlicher Lifetime Qt Champion
    replied to kyrlon on last edited by
    #13

    @kyrlon said in Failing to build Qt 6.6.2 from source on Windows 10 with MinGW64 compiler:

    Since I don't do much development on Windows, I was just wondering if this was a gcc or cmake limitation?

    Because the path is to long. Use a shorter source and build path and blame MS

    Already answered two days ago...

    Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
    Visit the Qt Academy at https://academy.qt.io/catalog

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    cristian-adam
    replied to jsulm on last edited by
    #14

    @jsulm said in Failing to build Qt 6.6.2 from source on Windows 10 with MinGW64 compiler:

    Too long paths is a Windows limitation

    Not quite. Windows has support for long paths (>255 characters) since Windows 10 version 1607 released on August 2015.

    But the applications need to opt-in in order to use the new functionality.

    It's a tooling problem:

    • Ninja - Is fixed but waiting for an official release (1.12)
    • GCC - Not fixed.
    • Visual C++ - Not fixed.
    • moc - Fixed since Qt 6.5.
    • make - Not fixed, but forgot to open a bug report.
    • clang - Works out of the box.
    • cmake - Works out of the box.

    So on Windows if you take llvm-mingw and a patched ninja you would be able to compile with clang and Qt 6.5+ just fine.

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    jsulmJ Offline
    jsulm Lifetime Qt Champion
    replied to cristian-adam on last edited by
    #15

    @cristian-adam said in Failing to build Qt 6.6.2 from source on Windows 10 with MinGW64 compiler:

    But the applications need to opt-in in order to use the new functionality

    Well, yes. But you can also see it as on OS problem if user has to do something special just to be able to use long paths. And I think this is a system wide setting and not per-application.

    https://forum.qt.io/topic/113070/qt-code-of-conduct

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    kyrlon
    replied to cristian-adam on last edited by
    #16

    @cristian-adam

    Attempt # 9 for building on windows

    Tried your suggestion, but got the same error of missing file of qplatformmediadevices_p.h

    1. Cleared out the build folder and ran the configure.bat like the following:
    PS C:\qt6\build> ..\configure.bat
    1. Ran the command cmake --build . --parallel

    Buikld stop with missing header file: https://pastebin.com/AZ7zDM2d

    I used the version of llvm-mingw:

    version of ninja used:

    PS C:\Users\kyrlon\Downloads\qt-everywhere-src-6.6.2\build> ninja --version
1.12.0.git
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    kyrlon
    replied to jsulm on last edited by
    #17

    @jsulm said in Failing to build Qt 6.6.2 from source on Windows 10 with MinGW64 compiler:

    You can also build in your user home folder like c:\users\USER_NAME\QT_BUILD_FOLDER

    Another alternative is to use a virtual drive using the subst command. I might make this attempt later.

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    cristian-adam
    replied to kyrlon on last edited by
    #18

    @kyrlon thank you for trying out llvm-mingw.

    I'll have a look at this since from my point of view all of the tools should allow for long paths.

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    kyrlon
    wrote on last edited by
    #19

    Attempt # 10 for building on windows [SUCCESS!!]

    Started from scratch by re-downloading the source and used the subst command to make a new path to build with.

    1. Created a virtual drive to avoid the PATH length limit:
    subst a: .\qt-everywhere-src-6.6.2\
    1. created the build folder and ran the configure.bat like the following:
    PS a:\build> ..\configure.bat

    1. Ran the command cmake --build . --parallel

    2. Ran the install command afterwards

    PS a:\build> cmake --build . --parallel

    No issues and everything was installed.

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