ldd shows a lot of dependencies even in static Qt version

Elias_Cute

I configured and built Qt 5.15 statically

mkdir ~/data
cd ~/data
wget https://download.qt.io/archive/qt/5.15/5.15.5/single/qt-everywhere-opensource-src-5.15.5.tar.xz
tar -xf qt-everywhere-opensource-src-5.15.5.tar.xz -C qt-5.15-v1
cd qt-5.15-v1/qt-everywhere-src-5.15.5/

./configure -static -prefix /opt/qt-5.15-v1-static -confirm-license -opensource -nomake examples -nomake tests -nomake tools -skip qtwebengine

Here is the full output ./configure https://pastebin.com/7EeqfH0N

make
sudo make install

QT installed successfully into /opt/qt-5.15-v1-static

After which I build a tiny test project without QML with one MainWindow:

cd ~/data/tinytest/
export PATH=/opt/qt-5.15-v1-static/bin:$PATH
qmake tinytest.pro -config release
make

Here is the full output make https://pastebin.com/rxvqu7Uj

Linking line (g++) does NOT have -static option!! =(

And ldd command shows a lot of dependencies

user@host:~/data/tinytest$ ldd tinytest
        linux-vdso.so.1 (0x00007ffc715dd000)
        libxcb-glx.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-glx.so.0 (0x00007f21798e7000)
        libxcb-icccm.so.4 => /usr/lib/x86_64-linux-gnu/libxcb-icccm.so.4 (0x00007f21796e2000)
        libxcb-image.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-image.so.0 (0x00007f21794dd000)
        libxcb-shm.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f21792da000)
        libxcb-keysyms.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-keysyms.so.1 (0x00007f21790d7000)
        libxcb-randr.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-randr.so.0 (0x00007f2178ec7000)
        libxcb-render-util.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-render-util.so.0 (0x00007f2178cc3000)
        libxcb-render.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-render.so.0 (0x00007f2178ab6000)
        libxcb-shape.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007f21788b2000)
        libxcb-sync.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-sync.so.1 (0x00007f21786ab000)
        libxcb-xfixes.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007f21784a3000)
        libxcb-xinerama.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-xinerama.so.0 (0x00007f21782a0000)
        libxcb-xkb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb-xkb.so.1 (0x00007f2178084000)
        libxcb-xinput.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-xinput.so.0 (0x000
...  and many more lines

Here is the full output ldd https://pastebin.com/iMPJZkFk

Elias_Cute

I used this official guide https://doc.qt.io/qt-5/linux-deployment.html

JonB

@Elias_Cute
Although I have never done Qt statically, so I am not an expert: all you have done is build and link the Qt libraries statically. For example, if/assuming your code calls for anything Qt you do not see any libQt... dynamic libraries as dependencies. Those you do see are the system/windowing system dynamic libraries.

I don't whether/why you would want them statically linked too, but if so you will have take some action on the linker line to specify this.

Elias_Cute

I don't whether/why you would want them statically linked too, but if so you will have take some action on the linker line to specify this.

There are too many of them and it is obvious that these dependencies were not brought by me - they were brought by Qt.

I have no idea how to link them statically.

jsulm

@Elias_Cute said in ldd shows a lot of dependencies even in static Qt version:

I have no idea how to link them statically

You would also have to build all these libraries as static libraries and then build Qt statically telling it to use these static libraries. These libraries are not part of Qt itself, they are provided by your Linux distribution and Qt depends on them.

Elias_Cute

@jsulm

So, after statically building Qt, I have to build these 65 libraries:

libxcb-glx.so
libxcb-icccm.so
libxcb-image.so
libxcb-shm.so
libxcb-keysyms.so
libxcb-randr.so
libxcb-render-util.so
libxcb-render.so
libxcb-shape.so
libxcb-sync.so
libxcb-xfixes.so
libxcb-xinerama.so
libxcb-xkb.so
libxcb-xinput.so
libSM.so
libICE.so
libxkbcommon-x11.so
libjpeg.so
libtiff.so
libgbm.so
libdrm.so
libudev.so
libX11-xcb.so
libxcb.so
libwayland-egl.so
libEGL.so
libXcomposite.so
libX11.so
libfontconfig.so
libfreetype.so
libdbus-1.so
libwayland-cursor.so
libwayland-client.so
libxkbcommon.so
libpng16.so
libharfbuzz.so
libz.so
libdouble-conversion.so
libicui18n.so
libicuuc.so
libdl.so
libglib-2.0.so.0
libGL.so
libm.so
libgcc_s.so
libxcb-util.so
libuuid.so
libbsd.so
liblzma.so
libjbig.so
libwayland-server.so
libexpat.so
librt.so
libXau.so
libXdmcp.so
libGLdispatch.so
libsystemd.so
libffi.so
libgraphite2.so
libicudata.so
libpcre.so
libGLX.so
liblz4.so
libgcrypt.so
libgpg-error.so

and only then will I get a statically-builded hello-world? Why isn't this mentioned in any manual?

p.s. I know about exclusion libraries: linux-vdso.so libc.so libpthread.so ld-linux-x86-64.so
They cannot be assembled statically. But what about the rest?