Invisible text in QTextEdit

[Alp Hancioglu]

I uninstalled Qt build with make uninstall and then fonts in VLC appeared. I am guessing Qt code in VLC was referencing Qt build libs in /usr/local/Qt-5.9.1/lib directory, which are deleted after uninstall, and this was causing the missing font in VLC. After uninstall VLC started referencing libs in /usr/lib/x86_64-linux-gnu/ which work and fonts appeared.

I tried compiling against headers and libs in qt-everywhere-opensource-src-5.9.1 directory, which is downloaded from qt website:

g++ -Wall -fPIC -c -g -I/home/alp/Downloads/qt-everywhere-opensource-src-5.9.1/qtbase/include -I/home/alp/Downloads/qt-everywhere-opensource-src-5.9.1/qtbase/include/QtWidgets main.cpp -o main.o
g++ -g -Wl,--trace main.o ext/printer.o -o main -L/home/alp/Downloads/qt-everywhere-opensource-src-5.9.1/qtbase/lib -lQt5Gui -lQt5Core -lQt5Widgets
/usr/bin/ld: mode elf_x86_64
/usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/crti.o
/usr/lib/gcc/x86_64-linux-gnu/6/crtbegin.o
main.o
ext/printer.o
-lQt5Gui (/home/alp/Downloads/qt-everywhere-opensource-src-5.9.1/qtbase/lib/libQt5Gui.so)
-lQt5Core (/home/alp/Downloads/qt-everywhere-opensource-src-5.9.1/qtbase/lib/libQt5Core.so)
-lQt5Widgets (/home/alp/Downloads/qt-everywhere-opensource-src-5.9.1/qtbase/lib/libQt5Widgets.so)
-lstdc++ (/usr/lib/gcc/x86_64-linux-gnu/6/libstdc++.so)
/lib/x86_64-linux-gnu/libm.so.6
/lib/x86_64-linux-gnu/libmvec.so.1
libgcc_s.so.1 (/usr/lib/gcc/x86_64-linux-gnu/6/libgcc_s.so.1)
/lib/x86_64-linux-gnu/libc.so.6
(/usr/lib/x86_64-linux-gnu/libc_nonshared.a)elf-init.oS
/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
libgcc_s.so.1 (/usr/lib/gcc/x86_64-linux-gnu/6/libgcc_s.so.1)
/usr/lib/gcc/x86_64-linux-gnu/6/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/crtn.o

When I run with ./main following errors appear:

./main: /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5: version Qt_5' not found (required by ./main) ./main: /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5: version Qt_5' not found (required by ./main)
./main: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version Qt_5.9' not found (required by ./main) ./main: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version Qt_5' not found (required by ./main)

which makes me guess that libs in qt-everywhere-opensource-src-5.9.1 are empty and g++ references the libs in x86_64-linux-gnu which are not the latest version 5.9 as expected.

[Alp Hancioglu]

@jsulm I don't notice much difference with -v but here it is.

./configure -system-freetype -fontconfig -v

• cd qtbase
• /home/alp/Downloads/qt-everywhere-opensource-src-5.9.1/qtbase/configure -top-level -system-freetype -fontconfig -v
  Creating qmake...
  make: Nothing to be done for 'first'.
  Command line: -system-freetype -fontconfig -v

Selecting Qt Edition.

Type 'c' if you want to use the Commercial Edition.
Type 'o' if you want to use the Open Source Edition.

Which edition of Qt do you want to use? o

This is the Qt Open Source Edition.

You are licensed to use this software under the terms of
the GNU Lesser General Public License (LGPL) version 3
or the GNU General Public License (GPL) version 2.

Type 'L' to view the GNU Lesser General Public License version 3 (LGPLv3).
Type 'G' to view the GNU General Public License version 2 (GPLv2).
Type 'y' to accept this license offer.
Type 'n' to decline this license offer.

Do you accept the terms of either license? y

Running configuration tests...
Done running configuration tests.

Configure summary:

Build type: linux-g++ (x86_64, CPU features: mmx sse sse2)
Configuration: use_gold_linker sse2 sse3 ssse3 sse4_1 sse4_2 avx avx2 avx512f avx512bw avx512cd avx512dq avx512er avx512ifma avx512pf avx512vbmi avx512vl compile_examples enable_new_dtags f16c largefile precompile_header shared rpath release c++11 c++14 c++1z concurrent dbus mremap reduce_exports reduce_relocations stl
Build options:
Mode ................................... release
Optimize release build for size ........ no
Building shared libraries .............. yes
Using C++ standard ..................... C++1z
Using gold linker ...................... yes
Using new DTAGS ........................ yes
Using precompiled headers .............. yes
Using LTCG ............................. no
Target compiler supports:
SSE .................................. SSE2 SSE3 SSSE3 SSE4.1 SSE4.2
AVX .................................. AVX AVX2 F16C
AVX512 ............................... F ER CD PF DQ BW VL IFMA VBMI
Build parts ............................ libs examples tools
Qt modules and options:
Qt Concurrent .......................... yes
Qt D-Bus ............................... yes
Qt D-Bus directly linked to libdbus .... no
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
QML debugging .......................... yes
udev ................................... no
Using system zlib ...................... yes
Qt Core:
DoubleConversion ....................... yes
Using system DoubleConversion ........ no
GLib ................................... no
iconv .................................. yes
ICU .................................... no
Logging backends:
journald ............................. no
syslog ............................... no
slog2 ................................ no
Using system PCRE2 ..................... no
Qt Network:
getaddrinfo() .......................... yes
getifaddrs() ........................... yes
IPv6 ifname ............................ yes
libproxy ............................... no
OpenSSL ................................ no
Qt directly linked to OpenSSL ........ no
SCTP ................................... no
Use system proxies ..................... yes
Qt Gui:
Accessibility .......................... yes
FreeType ............................... yes
Using system FreeType ................ no
HarfBuzz ............................... yes
Using system HarfBuzz ................ no
Fontconfig ............................. no
Image formats:
GIF .................................. yes
ICO .................................. yes
JPEG ................................. yes
Using system libjpeg ............... no
PNG .................................. yes
Using system libpng ................ no
EGL .................................... no
OpenVG ................................. no
OpenGL:
Desktop OpenGL ....................... yes
OpenGL ES 2.0 ........................ no
OpenGL ES 3.0 ........................ no
OpenGL ES 3.1 ........................ no
Session Management ..................... yes
Features used by QPA backends:
evdev .................................. yes
libinput ............................... no
INTEGRITY HID .......................... no
mtdev .................................. no
tslib .................................. no
xkbcommon-evdev ........................ no
QPA backends:
DirectFB ............................... no
EGLFS .................................. no
LinuxFB ................................ yes
VNC .................................... yes
Mir client ............................. no
X11:
Using system-provided XCB libraries .. no
EGL on X11 ........................... no
Xinput2 .............................. no
XCB XKB .............................. yes
XLib ................................. yes
XCB render ........................... yes
XCB GLX .............................. yes
XCB Xlib ............................. yes
Using system-provided xkbcommon ...... no
Qt Widgets:
GTK+ ................................... no
Styles ................................. Fusion Windows
Qt PrintSupport:
CUPS ................................... no
Qt Sql:
DB2 (IBM) .............................. no
InterBase .............................. no
MySql .................................. no
OCI (Oracle) ........................... no
ODBC ................................... no
PostgreSQL ............................. no
SQLite2 ................................ no
SQLite ................................. yes
Using system provided SQLite ......... no
TDS (Sybase) ........................... no
Qt SerialBus:
Socket CAN ............................. yes
Socket CAN FD .......................... yes
QtXmlPatterns:
XML schema support ..................... yes
Qt QML:
QML interpreter ........................ yes
QML network support .................... yes
Qt Quick:
Direct3D 12 ............................ no
AnimatedImage item ..................... yes
Canvas item ............................ yes
Support for Qt Quick Designer .......... yes
Flipable item .......................... yes
GridView item .......................... yes
ListView item .......................... yes
Path support ........................... yes
PathView item .......................... yes
Positioner items ....................... yes
ShaderEffect item ...................... yes
Sprite item ............................ yes
Qt Gamepad:
SDL2 ................................... no
Qt 3D:
Assimp ................................. yes
System Assimp .......................... no
Output Qt3D Job traces ................. no
Output Qt3D GL traces .................. no
Qt 3D GeometryLoaders:
Autodesk FBX ........................... no
Qt Wayland Client ........................ no
Qt Wayland Compositor .................... no
Qt Bluetooth:
BlueZ .................................. no
BlueZ Low Energy ....................... no
Linux Crypto API ....................... no
Qt Sensors:
sensorfw ............................... no
Qt Multimedia:
ALSA ................................... no
GStreamer 1.0 .......................... no
GStreamer 0.10 ......................... no
Video for Linux ........................ yes
OpenAL ................................. no
PulseAudio ............................. no
Resource Policy (libresourceqt5) ....... no
Windows Audio Services ................. no
DirectShow ............................. no
Windows Media Foundation ............... no
Qt Quick Controls 2:
Styles ................................. Default Material Universal
Qt Quick Templates 2:
Hover support .......................... yes
Multi-touch support .................... yes
Qt Location:
Gypsy GPS Daemon ....................... no
WinRT Geolocation API .................. no
Qt WebEngine:
Embedded build ......................... no
Pepper Plugins ......................... yes
Printing and PDF ....................... yes
Proprietary Codecs ..................... no
Spellchecker ........................... yes
WebRTC ................................. yes
Using system ninja ..................... no
ALSA ................................... no
PulseAudio ............................. no
System libraries:
ICU .................................. no
libwebp and libwebpdemux ............. no
Opus ................................. no
ffmpeg ............................... no

Note: Also available for Linux: linux-clang linux-icc

Note: Disabling Linux Accessibility Bridge: D-Bus is missing.

Note: No wayland-egl support detected. Cross-toolkit compatibility disabled.

ERROR: Feature 'system-freetype' was enabled, but the pre-condition 'features.freetype && libs.freetype' failed.

ERROR: Feature 'fontconfig' was enabled, but the pre-condition '!config.win32 && !config.darwin && features.system-freetype && libs.fontconfig' failed.

[jsulm]

@Alp-Hancioglu said in Invisible text in QTextEdit:

Configure summary

There must be much more output before "Configure summary".
You should try it again from a clean state (you built before, so unzip source archive again).

[Alp Hancioglu]

@jsulm I unzipped and run ./configure -system-freetype -fontconfig -v again and everything seems ok now:

Qt Gui:
  Accessibility .......................... yes
  FreeType ............................... yes
    Using system FreeType ................ yes
  HarfBuzz ............................... yes
    Using system HarfBuzz ................ yes
  Fontconfig ............................. yes

Do you still need the debug info? I don't think its necessary now. I don't know what caused previous fails. I will "make" and "make install" and try again now.

[jsulm]

@Alp-Hancioglu OK. To avoid such issues you should do "out of source builds" in the future. This means: create a directory OUTSIDE of the source directory, change to this directory, call configure from there and make.
Lets say you're in a directory where the subdirectory with Qt sources is located:

mkdir build
cd build
../qt/configure ...
make
make install

This way your source tree will stay unchanged and if you want to rebuild just delete the content of the build directory and build again.

[Alp Hancioglu]

I built qt and font show up now. Thanks a lot jsulm for the support.