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

[cristian-adam]

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.

[kyrlon]

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

[Christian Ehrlicher]

@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.

[cristian-adam]

@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

[kyrlon]

@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.

[kyrlon]

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

2. 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

2. Ran the command cmake --build . --parallel
   SUCCESS!
3. 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:\.

[jsulm]

@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

[kyrlon]

@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?

[jsulm]

@kyrlon Too long paths is a Windows limitation

[Christian Ehrlicher]

@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...

[cristian-adam]

@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.

[jsulm]

@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.

[kyrlon]

@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

2. 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

[kyrlon]

@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.

[cristian-adam]

@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.

[kyrlon]

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

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

3. Ran the install command afterwards

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

No issues and everything was installed.