Built Qt6 from sources, problem with xcb plugin
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Installation and Deployment
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wrote on 2 Dec 2020, 19:43 last edited by
The compilation has no errors, the problem is that platform plugin for xcb is not generated.
➜ build ls -al total 37248 drwxr-xr-x 17 mnesarco mnesarco 4096 Dec 2 14:26 . drwxrwxr-x 5 mnesarco mnesarco 4096 Dec 2 11:50 .. -rw-r--r-- 1 mnesarco mnesarco 18076483 Dec 2 14:26 build.ninja -rw-r--r-- 1 mnesarco mnesarco 320652 Dec 2 14:26 CMakeCache.txt drwxr-xr-x 4 mnesarco mnesarco 4096 Dec 2 14:26 CMakeFiles -rw-r--r-- 1 mnesarco mnesarco 4430 Dec 2 13:19 cmake_install.cmake -rw-r--r-- 1 mnesarco mnesarco 129 Dec 2 14:26 config.opt drwxr-xr-x 4 mnesarco mnesarco 4096 Dec 2 11:55 config.tests -rw-r--r-- 1 mnesarco mnesarco 633 Dec 2 12:56 CTestTestfile.cmake -rw-r--r-- 1 mnesarco mnesarco 977889 Dec 2 12:25 install_manifest.txt -rw-r--r-- 1 mnesarco mnesarco 17585308 Dec 2 14:35 .ninja_deps -rw-r--r-- 1 mnesarco mnesarco 1082507 Dec 2 14:35 .ninja_log drwxr-xr-x 4 mnesarco mnesarco 4096 Dec 2 14:26 qt5compat drwxr-xr-x 14 mnesarco mnesarco 4096 Dec 2 14:26 qtbase drwxr-xr-x 5 mnesarco mnesarco 4096 Dec 2 14:26 qtdeclarative drwxr-xr-x 4 mnesarco mnesarco 4096 Dec 2 14:26 qtdoc drwxr-xr-x 3 mnesarco mnesarco 4096 Dec 2 14:26 qtqa drwxr-xr-x 5 mnesarco mnesarco 4096 Dec 2 14:26 qtquick3d drwxr-xr-x 4 mnesarco mnesarco 4096 Dec 2 14:26 qtquickcontrols2 drwxr-xr-x 4 mnesarco mnesarco 4096 Dec 2 14:26 qtquicktimeline drwxr-xr-x 5 mnesarco mnesarco 4096 Dec 2 14:26 qtshadertools drwxr-xr-x 4 mnesarco mnesarco 4096 Dec 2 14:26 qtsvg drwxr-xr-x 4 mnesarco mnesarco 4096 Dec 2 14:26 qttools drwxr-xr-x 4 mnesarco mnesarco 4096 Dec 2 14:26 qttranslations drwxr-xr-x 4 mnesarco mnesarco 4096 Dec 2 12:00 qtwaylan -
Hi Friends, There is another topic about this but it is old and does not provide a solution, so I ask here for some help:
I have compiled Qt6 on Linux Mint 19, but the QPA plugin for xcb is not generated, so my App does not run.
This is my configure summary:
Configure summary: Building for: linux-clang (x86_64, CPU features: mmx sse sse2) Compiler: clang 11.0.1 Build options: Mode ................................... debug Fully optimize release builds (-O3) .... no Building shared libraries .............. yes Using C standard ....................... C11 Using C++ standard ..................... C++17 Using ccache ........................... no enable_new_dtags ....................... no Relocatable ............................ yes Using precompiled headers .............. yes Using LTCG ............................. no Target compiler supports: SSE .................................. SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 AVX .................................. AVX AVX2 AVX512 ............................... F ER CD PF DQ BW VL IFMA VBMI Other x86 ............................ F16C RDRAND Intrinsics without -mXXX option ...... yes Sanitizers: Addresses ............................ no Threads .............................. no Memory ............................... no Fuzzer (instrumentation only) ........ no Undefined ............................ no Build parts ............................ libs tools Qt modules and options: Qt Concurrent .......................... yes Qt D-Bus ............................... yes Qt D-Bus directly linked to libdbus .... yes Qt Gui ................................. yes Qt Network ............................. yes Qt Sql ................................. yes Qt Testlib ............................. yes Qt Widgets ............................. yes Qt Xml ................................. yes Support enabled for: Using pkg-config ....................... yes udev ................................... yes Using system zlib ...................... yes Zstandard support ...................... no Qt Core: DoubleConversion ....................... yes Using system DoubleConversion ........ no GLib ................................... yes ICU .................................... yes Using system libb2 ..................... no Built-in copy of the MIME database ..... yes Tracing backend ........................ <none> Logging backends: journald ............................. no syslog ............................... no slog2 ................................ no PCRE2 .................................. yes Using system PCRE2 ................... no CLONE_PIDFD support in forkfd .......... yes Qt Sql: SQL item models ........................ yes Qt Network: getifaddrs() ........................... yes IPv6 ifname ............................ yes libproxy ............................... no Linux AF_NETLINK ....................... yes OpenSSL ................................ yes Qt directly linked to OpenSSL ........ no OpenSSL 1.1 ............................ yes DTLS ................................... yes OCSP-stapling .......................... yes SCTP ................................... no Use system proxies ..................... yes GSSAPI ................................. no Brotli Decompression Support ........... no Qt Gui: Accessibility .......................... yes FreeType ............................... yes Using system FreeType ................ yes HarfBuzz ............................... yes Using system HarfBuzz ................ no Fontconfig ............................. yes Image formats: GIF .................................. yes ICO .................................. yes JPEG ................................. yes Using system libjpeg ............... no PNG .................................. yes Using system libpng ................ yes Text formats: HtmlParser ........................... yes CssParser ............................ yes OdfWriter ............................ yes MarkdownReader ....................... yes Using system libmd4c ............... no MarkdownWriter ....................... yes EGL .................................... yes OpenVG ................................. no OpenGL: Desktop OpenGL ....................... yes OpenGL ES 2.0 ........................ no OpenGL ES 3.0 ........................ no OpenGL ES 3.1 ........................ no OpenGL ES 3.2 ........................ no Vulkan ................................. no Session Management ..................... yes Features used by QPA backends: evdev .................................. yes libinput ............................... no INTEGRITY HID .......................... no mtdev .................................. no tslib .................................. no xkbcommon .............................. yes X11 specific: XLib ................................. yes XCB Xlib ............................. no EGL on X11 ........................... yes xkbcommon-x11 ........................ no QPA backends: DirectFB ............................... no EGLFS .................................. yes EGLFS details: EGLFS OpenWFD ........................ no EGLFS i.Mx6 .......................... no EGLFS i.Mx6 Wayland .................. no EGLFS RCAR ........................... no EGLFS EGLDevice ...................... yes EGLFS GBM ............................ no EGLFS VSP2 ........................... no EGLFS Mali ........................... no EGLFS Raspberry Pi ................... no EGLFS X11 ............................ no LinuxFB ................................ yes VNC .................................... yes QNX: lgmon ................................ no IMF .................................. no XCB: Using system-provided xcb-xinput ..... no Native painting (experimental) ....... no GL integrations: GLX Plugin ......................... no XCB GLX .......................... no EGL-X11 Plugin ..................... no Windows: Direct 2D ............................ no Direct 2D 1.1 ........................ no DirectWrite .......................... no DirectWrite 3 ........................ no Qt Widgets: GTK+ ................................... yes Styles ................................. Fusion Windows Qt Testlib: Tester for item models ................. yes Qt PrintSupport: CUPS ................................... no Qt Sql Drivers: DB2 (IBM) .............................. no InterBase .............................. no MySql .................................. no OCI (Oracle) ........................... no ODBC ................................... no PostgreSQL ............................. yes SQLite ................................. yes Using system provided SQLite ......... no Qt 5 Compatibility Libraries: iconv .................................. no Qt QML: QML network support .................... yes QML debugging and profiling support .... yes QML just-in-time compiler .............. yes QML sequence object .................... yes QML XML http request ................... yes QML Locale ............................. yes Qt QML Models: QML list model ......................... yes QML delegate model ..................... yes Qt Quick: AnimatedImage item ..................... yes Canvas item ............................ yes Support for Qt Quick Designer .......... yes Flipable item .......................... yes GridView item .......................... yes ListView item .......................... yes TableView item ......................... yes Path support ........................... yes PathView item .......................... yes Positioner items ....................... yes Repeater item .......................... yes ShaderEffect item ...................... yes Sprite item ............................ yes Qt Tools: Qt Assistant ........................... yes QDoc ................................... no Clang-based lupdate parser ............. no Qt Designer ............................ yes Qt Distance Field Generator ............ yes kmap2qmap .............................. yes Qt Linguist ............................ yes Mac Deployment Tool .................... no pixeltool .............................. yes qdbus .................................. yes qev .................................... yes Qt Attributions Scanner ................ yes qtdiag ................................. yes qtpaths ................................ yes qtplugininfo ........................... yes Windows deployment tool ................ no Qt Quick Templates 2: Hover support .......................... yes Multi-touch support .................... yes Qt Quick Controls 2: Styles ................................. Basic Fusion Imagine Material Universal macOS Windows QtQuick3D: Assimp ................................. yes System Assimp .......................... noAll libxcb*-dev libcxb* packages are installed an detected by configure script, but it appears to be not recognized in the summary.
Thanks in adavance for any help.
@mnesarco said in Built Qt6 from sources, problem with xcb plugin:
XCB Xlib ............................. no
Apart from what you're saying but it looks like some of the required xcb stuff is not found.
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@mnesarco said in Built Qt6 from sources, problem with xcb plugin:
XCB Xlib ............................. no
Apart from what you're saying but it looks like some of the required xcb stuff is not found.
wrote on 2 Dec 2020, 19:56 last edited by@Christian-Ehrlicher It is obvious, some xcb stuff is not found, the question is what. Because ./configure reports a lot of crap like this:
-- Found XCB: /usr/lib/x86_64-linux-gnu/libxcb.so;/usr/lib/x86_64-lin... -
wrote on 2 Dec 2020, 20:09 last edited by
I have found CMakeError.log and CMakeOutput.log, they have a lot of things but nothing related with xcb.
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According to the config file XCB xlib needs:
"xcb_xlib": { "label": "XCB Xlib", "test": { "main": "(void) XGetXCBConnection((Display *)0);" }, "headers": "X11/Xlib-xcb.h", "sources": [ { "type": "pkgConfig", "args": "x11-xcb" }, "-lX11-xcb" ], "use": "xcb xlib" -
wrote on 2 Dec 2020, 20:21 last edited by
It is installed:
➜ qtbase dpkg -la | grep Xlib ii libx11-xcb-dev:amd64 2:1.6.4-3ubuntu0.3 amd64 Xlib/XCB interface library (development headers) ii libx11-xcb1:amd64 2:1.6.4-3ubuntu0.3 amd64 Xlib/XCB interface library -
Lifetime Qt Championwrote on 2 Dec 2020, 20:27 last edited by Christian Ehrlicher 12 Feb 2020, 20:30
Try to search for some output of those values inside CMakeFiles subdir and try to compile this
#include <X11/Xlib-xcb.h> int main(int, char**) { (void) XGetXCBConnection((Display *)0); return 0; }g++ main.cpp -lX11-xcb
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wrote on 2 Dec 2020, 20:40 last edited by
@Christian-Ehrlicher said in Built Qt6 from sources, problem with xcb plugin:
#include <X11/Xlib-xcb.h>
int main(int, char**)
{
(void) XGetXCBConnection((Display *)0);
return 0;
}➜ test99 vi test.cpp ➜ test99 c++ test.cpp -lX11-xcb ➜ test99 ./a.out [1] 12914 segmentation fault (core dumped) ./a.out ➜ test99 It compiles, but segfault on run. -
Doesn't matter that it does not execute - cmake only checks if it compiles and links. Sorry you have to dig though the CMakeFiles directory.
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wrote on 2 Dec 2020, 20:50 last edited by
Apparently it was some kind of cache problem. Because I deleted the build folder, opened a new terminal a build from scratch and:
Features used by QPA backends: evdev .................................. yes libinput ............................... yes INTEGRITY HID .......................... no mtdev .................................. yes tslib .................................. no xkbcommon .............................. yes X11 specific: XLib ................................. yes XCB Xlib ............................. yes EGL on X11 ........................... yes xkbcommon-x11 ........................ yes QPA backends: DirectFB ............................... no EGLFS .................................. yes EGLFS details: EGLFS OpenWFD ........................ no EGLFS i.Mx6 .......................... no EGLFS i.Mx6 Wayland .................. no EGLFS RCAR ........................... no EGLFS EGLDevice ...................... yes EGLFS GBM ............................ no EGLFS VSP2 ........................... no EGLFS Mali ........................... no EGLFS Raspberry Pi ................... no EGLFS X11 ............................ yes LinuxFB ................................ yes VNC .................................... yes QNX: lgmon ................................ no IMF .................................. no XCB: Using system-provided xcb-xinput ..... yes Native painting (experimental) ....... no GL integrations: GLX Plugin ......................... yes XCB GLX .......................... yes EGL-X11 Plugin ..................... yes Windows: Direct 2D ............................ no Direct 2D 1.1 ........................ no DirectWrite .......................... no DirectWrite 3 ........................ noIt is building, so I will report if succeed.
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wrote on 2 Dec 2020, 21:15 last edited by
I can confirm that it worked. So which was exactly the missing dependency I don't know. But after installing all the mentioned libraries and build from scratch on an empty build directory, it worked.
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As the configure scripts prints at the end: if you re-run configure, you have to clean first. Otherwise you may have leftovers from your previous configure/build attempt that will make it so that not all tests are rerun.
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I can confirm that it worked. So which was exactly the missing dependency I don't know. But after installing all the mentioned libraries and build from scratch on an empty build directory, it worked.
wrote on 15 Jan 2024, 18:13 last edited by@mnesarco I think it's worth mentioning (on an old thread) that in my case the (erroneously) missing dependencies included XCB GLX and xcb-sm (maybe others). It's important to pay careful attention to the output from
./configureand compare.
