Compile Qt Sources for Linux 32-bit

[EnormousSoft]

Host os = Xubuntu 18.04.2 64-bit
Qt sources = 5.12.1
Qt creator = 4.8.2

$ ./configure -platform linux-g++-32

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

WARNING: QDoc will not be compiled, probably because libclang could not be located. This means that you cannot build the Qt documentation.

Either ensure that llvm-config is in your PATH environment variable, or set LLVM_INSTALL_DIR to the location of your llvm installation.
On Linux systems you may be able to install libclang from a package. On macOS you could use Homebrew's llvm package.
On Windows you need to set LLVM_INSTALL_DIR to the installation path.

ERROR: The OpenGL functionality tests failed!
You might need to modify the include and library search paths by editing QMAKE_INCDIR_OPENGL[_ES2],
QMAKE_LIBDIR_OPENGL[_ES2] and QMAKE_LIBS_OPENGL[_ES2] in the mkspec for your platform.

Check config.log for details.

Checking for pkg-config ... no
Checking for xkbcommon >= 0.5.0... no
xkbcommon .............................. no

WARNING: Cross compiling without sysroot. Disabling pkg-config

ERROR: Feature 'xcb' was enabled, but the pre-condition 'features.thread && features.xkbcommon && libs.xcb' failed.

I want to build applications for linux 32-bit, How?

[EnormousSoft]

For linux x64 64-bit on linux x64 64-bit :

sudo apt install make g++ libgl1-mesa-dev pkg-config libxkbcommon-dev libxkbcommon-dev

./configure -qt-xcb

For linux x86 32-bit on linux x64 64-bit :

sudo apt install make g++-multilib libgl1-mesa-dev:i386 libglu1-mesa-dev:i386 pkg-config:i386 libxkbcommon-dev:i386 libxkbcommon-dev:i386

./configure -platform linux-g++-32 -qt-xcb

Note: For Windows Vista 7 8 8.1 10 use last Qt release, but for Windows XP use Qt 5.6.3

For Windows x86 32-bit on Linux 64-bit :

sudo apt install make g++ mingw-w64

./configure -opengl desktop -xplatform win32-g++ -device-option CROSS_COMPILE=/usr/bin/i686-w64-mingw32-

For Windows x64 64-bit on Linux x64 64-bit :

sudo apt install make g++ mingw-w64

./configure -opengl desktop -xplatform win32-g++ -device-option CROSS_COMPILE=/usr/bin/x86_64-w64-mingw32-

Note: For Android you need download NDK and SDK

For Android ARM v7 :

sudo apt install make g++ openjdk-11-jdk

./configure -xplatform android-clang -android-ndk "./android-ndk-r19c" -android-sdk "./sdk" -android-ndk-host linux-x86_64 -android-toolchain-version 4.9 -android-ndk-platform android-28 -skip qttranslations -skip qtserialport -android-arch armeabi-v7a

For Android x86 :

sudo apt install make g++ openjdk-11-jdk

./configure -xplatform android-clang -android-ndk "./android-ndk-r19c" -android-sdk "./sdk" -android-ndk-host linux-x86_64 -android-toolchain-version 4.9 -android-ndk-platform android-28 -skip qttranslations -skip qtserialport -android-arch x86

More parameters can be added :

./configure -opensource -confirm-license -nomake examples -nomake tests -release -prefix "./install-path"

More packages can be installed :

sudo apt install gperf bison flex

Bug in build Qt 5.12 for Windows x86 :
Fix it by edit "./qtbase/src/corelib/global/qrandom.cpp" from "#if defined(Q_PROCESSOR_X86) && QT_COMPILER_SUPPORTS_HERE(RDRND)" to "#if 0"

Bug in Android SDK :
Fix it by edit "./sdk/tools/bin/sdkmanager" from " DEFAULT_JVM_OPTS='"-Dcom.android.sdklib.toolsdir=$APP_HOME"' " to " DEFAULT_JVM_OPTS='"-Dcom.android.sdklib.toolsdir=$APP_HOME" -XX:+IgnoreUnrecognizedVMOptions --add-modules java.se.ee' "

[EnormousSoft]

This post is deleted!

[mrjj]

Hi
You also need all the required dependencies.
https://doc.qt.io/qt-5/build-sources.html

[EnormousSoft]

All requirements have been successfully installed, but the error still exists.
If use "-no-opengl" everything successfully without error
And also i can compile 32-bit "Widget" applications successfully
But without "-opengl" I could not run 32-bit "Widget" applications, becouse the "libqxcb.so" file not found !!!
How to fix it ?

[JonB]

@EnormousSoft
Google for libqxcb.so ? E.g.

• https://forum.qt.io/topic/48556/libqxcb-so-not-found
• https://forum.qt.io/topic/91223/qt-not-generating-libqxcb-so-inside-platforms
• https://github.com/probonopd/linuxdeployqt/issues/64
• https://askubuntu.com/questions/308128/failed-to-load-platform-plugin-xcb-while-launching-qt5-app-on-linux-without (this one looks good)

?

[jsulm]

@EnormousSoft Add -v parameter to configure and take a look at the output - it should tell more about the problem (missing headers/libs probably).

[EnormousSoft]

For linux x64 64-bit on linux x64 64-bit :

sudo apt install make g++ libgl1-mesa-dev pkg-config libxkbcommon-dev libxkbcommon-dev

./configure -qt-xcb

For linux x86 32-bit on linux x64 64-bit :

sudo apt install make g++-multilib libgl1-mesa-dev:i386 libglu1-mesa-dev:i386 pkg-config:i386 libxkbcommon-dev:i386 libxkbcommon-dev:i386

./configure -platform linux-g++-32 -qt-xcb

Note: For Windows Vista 7 8 8.1 10 use last Qt release, but for Windows XP use Qt 5.6.3

For Windows x86 32-bit on Linux 64-bit :

sudo apt install make g++ mingw-w64

./configure -opengl desktop -xplatform win32-g++ -device-option CROSS_COMPILE=/usr/bin/i686-w64-mingw32-

For Windows x64 64-bit on Linux x64 64-bit :

sudo apt install make g++ mingw-w64

./configure -opengl desktop -xplatform win32-g++ -device-option CROSS_COMPILE=/usr/bin/x86_64-w64-mingw32-

Note: For Android you need download NDK and SDK

For Android ARM v7 :

sudo apt install make g++ openjdk-11-jdk

./configure -xplatform android-clang -android-ndk "./android-ndk-r19c" -android-sdk "./sdk" -android-ndk-host linux-x86_64 -android-toolchain-version 4.9 -android-ndk-platform android-28 -skip qttranslations -skip qtserialport -android-arch armeabi-v7a

For Android x86 :

sudo apt install make g++ openjdk-11-jdk

./configure -xplatform android-clang -android-ndk "./android-ndk-r19c" -android-sdk "./sdk" -android-ndk-host linux-x86_64 -android-toolchain-version 4.9 -android-ndk-platform android-28 -skip qttranslations -skip qtserialport -android-arch x86

More parameters can be added :

./configure -opensource -confirm-license -nomake examples -nomake tests -release -prefix "./install-path"

More packages can be installed :

sudo apt install gperf bison flex

Bug in build Qt 5.12 for Windows x86 :
Fix it by edit "./qtbase/src/corelib/global/qrandom.cpp" from "#if defined(Q_PROCESSOR_X86) && QT_COMPILER_SUPPORTS_HERE(RDRND)" to "#if 0"

Bug in Android SDK :
Fix it by edit "./sdk/tools/bin/sdkmanager" from " DEFAULT_JVM_OPTS='"-Dcom.android.sdklib.toolsdir=$APP_HOME"' " to " DEFAULT_JVM_OPTS='"-Dcom.android.sdklib.toolsdir=$APP_HOME" -XX:+IgnoreUnrecognizedVMOptions --add-modules java.se.ee' "

[evgen48]

@EnormousSoft said in Compile Qt Sources for Linux 32-bit:

For linux x86 32-bit on linux x64 64-bit :
sudo apt install make g++-multilib libgl1-mesa-dev:i386 libglu1-mesa-dev:i386 pkg-config:i386 libxkbcommon-dev:i386 libxkbcommon-dev:i386

./configure -platform linux-g++-32 -qt-xcb

also need to add :

sudo apt install -y libharfbuzz-dev:i386

otherwise got an error

CMake Error at qtbase/cmake/FindWrapSystemHarfbuzz.cmake:56 (target_link_libraries):
  The link interface of target "WrapSystemHarfbuzz::WrapSystemHarfbuzz"
  contains:

    PkgConfig::PC_HARFBUZZ

  but the target was not found.  Possible reasons include:

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.