Building v5.9.7 from source errors and fails.

[Paidoo]

Hi,

I am trying to build Qt5 v5.9.7 from source inside a Singularity container, under AlmaLinux 8.7.

I am following the instructions here.

Summary of the commands used:

dnf install perl-version git gcc-c++ compat-openssl10 openssl-devel harfbuzz-devel double-conversion-devel libzstd-devel at-spi2-atk-devel dbus-devel mesa-libGL-devel xcb-util libxkbcommon-devel

git clone git://code.qt.io/qt/qt5.git
cd qt5
git checkout tags/v5.9.7 -b v5.9.7
./init-repository --module-subset=essential,addon,-qtwebengine

mkdir /qt5_build && cd /qt5_build
../qt5/configure -developer-build -opensource -nomake examples -nomake tests --confirm-license

make -j 18

The build fails, giving me the following errors:

/root/qt5/qtbase/src/gui/painting/qoutlinemapper.cpp: In member function 'QT_FT_Outline* QOutlineMapper::convertPath(const QVectorPath&)':
/root/qt5/qtbase/src/gui/painting/qoutlinemapper.cpp:182:76: error: 'void* memcpy(void*, const void*, size_t)' copying an object of non-trivial type 'class QPointF' from an array of 'const qreal' {aka 'const double'} [-Werror=class-memaccess]
             memcpy(m_elements.data(), path.points(), count* sizeof(QPointF));
                                                                            ^
In file included from ../../include/QtCore/qpoint.h:1,
                 from ../../include/QtGui/../../../../qt5/qtbase/src/gui/kernel/qguiapplication.h:48,
                 from ../../include/QtGui/qguiapplication.h:1,
                 from /root/qt5/qtbase/src/gui/kernel/qt_gui_pch.h:68:
../../include/QtCore/../../../../qt5/qtbase/src/corelib/tools/qpoint.h:219:21: note: 'class QPointF' declared here
 class Q_CORE_EXPORT QPointF
                     ^~~~~~~

/root/qt5/qtbase/src/gui/painting/qpainter.cpp: In member function 'void QPainterPrivate::drawGlyphs(const quint32*, QFixedPoint*, int, QFontEngine*, bool, bool, bool)':
/root/qt5/qtbase/src/gui/painting/qpainter.cpp:5625:68: error: 'void* memset(void*, int, size_t)' clearing an object of non-trivial type
struct QFixed'; use assignment or value-initialization instead [-Werror=class-memaccess]
         memset(advances.data(), 0, advances.size() * sizeof(QFixed));
                                                                    ^
In file included from ../../include/QtGui/5.9.7/QtGui/private/qfixed_p.h:1,
                 from ../../include/QtGui/5.9.7/QtGui/private/../../../../../../../qt5/qtbase/src/gui/text/qfont_p.h:61,
                 from ../../include/QtGui/5.9.7/QtGui/private/qfont_p.h:1,
                 from ../../include/QtGui/5.9.7/QtGui/private/../../../../../../../qt5/qtbase/src/gui/text/qtextengine_p.h:60,
                 from ../../include/QtGui/5.9.7/QtGui/private/qtextengine_p.h:1,
                 from ../../include/QtGui/5.9.7/QtGui/private/../../../../../../../qt5/qtbase/src/gui/text/qfontengine_p.h:59,
                 from ../../include/QtGui/5.9.7/QtGui/private/qfontengine_p.h:1,
                 from /root/qt5/qtbase/src/gui/painting/qpainter.cpp:65:
../../include/QtGui/5.9.7/QtGui/private/../../../../../../../qt5/qtbase/src/gui/painting/qfixed_p.h:61:8: note: 'struct QFixed' declared here
 struct QFixed {
        ^~~~~~
/root/qt5/qtbase/src/gui/painting/qpainter.cpp:5626:103: error: 'void* memset(void*, int, size_t)' clearing an object of non-trivial type 'struct QGlyphJustification'; use assignment or value-initialization instead [-Werror=class-memaccess]
         memset(glyphJustifications.data(), 0, glyphJustifications.size() * sizeof(QGlyphJustification));
                                                                                                       ^
In file included from ../../include/QtGui/5.9.7/QtGui/private/qtextengine_p.h:1,
                 from ../../include/QtGui/5.9.7/QtGui/private/../../../../../../../qt5/qtbase/src/gui/text/qfontengine_p.h:59,
                 from ../../include/QtGui/5.9.7/QtGui/private/qfontengine_p.h:1,
                 from /root/qt5/qtbase/src/gui/painting/qpainter.cpp:65:
../../include/QtGui/5.9.7/QtGui/private/../../../../../../../qt5/qtbase/src/gui/text/qtextengine_p.h:158:8: note: 'struct QGlyphJustification' declared here
 struct QGlyphJustification
        ^~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
make[3]: *** [Makefile:66910: .obj/qpainter.o] Error 1
make[3]: Leaving directory '/root/qt5_build/qtbase/src/gui'
make[2]: *** [Makefile:500: sub-gui-make_first] Error 2
make[2]: Leaving directory '/root/qt5_build/qtbase/src'
make[1]: *** [Makefile:49: sub-src-make_first] Error 2
make[1]: Leaving directory '/root/qt5_build/qtbase'
make: *** [Makefile:79: module-qtbase-make_first] Error 2

I have tried to search online, but been unable to find a solution. Any help would be deeply appreciated!

---

In case context is helpful:

I am trying to create a singularity container as a common development environment. In my case Qt5 is a dependency of Geant4, which is the application I ultimately need. Specifically: Qt5Core, Qt5Gui Qt5Widgets, Qt5OpenGL, and Qt5PrintSupport

I need this container to be able to run on a CentOS7 cluster, which is running with the following kernel:

uname -r
3.10.0-1160.76.1.el7.x86_64

When I try to run my compiled package (specifically on CentOS7) I receive the following error:

error while loading shared libraries: libQt5Core.so.5: cannot open shared object file: No such file or directory

libQt5Core.so.5 is in place, and the container works on 'more modern' hosts. Searching online I discovered that Qt5 v5.15, libQt5Core.so.5 requires linux kernel >v3.15.0.

The CentOS7 host has Qt v5.9.7 installed, and therefore I am trying to build this from source in my container to impose compatibility with the v3.10 kernel.

[SGaist]

Hi and welcome to devnet,

Why not use the Qt development packages from that distribution ?

[Paidoo]

@SGaist thanks for your reply.

Do you mean why not use the development packages available on AlmaLinux via dnf?

If so, due to the bug I explain at the bottom of my post. I need an older version of Qt5 from before whenever the kernel dependency was introduced.

If not, please excuse my density, and can I ask you to elaborate? :)

[SGaist]

@Paidoo I may have misunderstood you. You want a CentOS based image to execute on Alma Linux using singularity ?

[Paidoo]

@SGaist Not quite, I am sorry for being unclear.

I am trying to create a modern(-ish) development environment to be used on a cluster that is currently stuck on CentOS7 (that I have no control over).

I have created a working image, but it uses Qt5-v5.15, as this is what is available on modern distributions. Qt5-v5.15 is incompatible with linux kernel <v3.15. The cluster has kernel v3.10.

To try and get around this, I am attempting to compile Qt5-v5.9.7 inside my container (running AlmaLinux8), as I know this does not contain whatever change broke Qt5 on the old kernel.

When trying to compile it, the compilation crashes with the errors given above and here I am.

I hope this clarifies!

[Christian Ehrlicher]

I would guess the gcc is to new for this.
Either downgrade gcc or look at the git history of the affected sources to see if there is a fix for this which you can apply to 5.9