These Docker images allow you to very easily build a Qt app accross all platforms. You may use build system (e.g. Gitlab CI) to fully leverage these images.

Qt toolchain Docker images

Qt 5.9.8 LTS (EOL 2020-05-31)

• a12e/docker-qt:5.9-android_armv7 (Platform 21, NDK r17c [gcc], OpenSSL 1.0.2s [EOL 2019-12-31])
• a12e/docker-qt:5.9-gcc_64 (Ubuntu 16.04 LTS, SDL 2.0.9, linuxdeployqt 6)

Qt 5.12.4 LTS (EOL 2021)

• a12e/docker-qt:5.12-android_armv7 (Platform 21, NDK r19c [clang], OpenSSL 1.1.1c)
• a12e/docker-qt:5.12-android_arm64_v8a (Platform 21, NDK r19c [clang], OpenSSL 1.1.1c)
• a12e/docker-qt:5.12-android_x86 (Platform 21, NDK r19c [clang], OpenSSL 1.1.1c)
• a12e/docker-qt:5.12-gcc_64 (Ubuntu 16.04 LTS, SDL 2.0.9, linuxdeployqt 6)

Qt 5.13.1 (EOL 2020)

• a12e/docker-qt:5.13-android_armv7 (Platform 21, NDK r19c [clang], OpenSSL 1.1.1c)
• a12e/docker-qt:5.13-android_arm64_v8a (Platform 21, NDK r19c [clang], OpenSSL 1.1.1c)
• a12e/docker-qt:5.13-android_x86 (Platform 21, NDK r19c [clang], OpenSSL 1.1.1c)
• a12e/docker-qt:5.13-android_x86_64 (Platform 21, NDK r19c [clang], OpenSSL 1.1.1c)
• a12e/docker-qt:5.13-gcc_64 (Ubuntu 16.04 LTS, SDL 2.0.9, linuxdeployqt 6)

Android example

docker run -it --rm a12e/docker-qt:5.12-android_armv7

# Clone repo with source
git clone --recursive <repo> ~/src
# Make build dir & cd into
mkdir ~/build && cd ~/build
# Run qmake, optional: ship the OpenSSL libraries
qmake -r ~/src ANDROID_EXTRA_LIBS+=$ANDROID_DEV/lib/libcrypto.so ANDROID_EXTRA_LIBS+=$ANDROID_DEV/lib/libssl.so
# Run make
make
# Run make install 
make install INSTALL_ROOT=$HOME/dist
# Create APK
androiddeployqt --input android-libMyAppName.so-deployment-settings.json --output dist/ --android-platform $SDK_PLATFORM --deployment bundled --gradle --release

Linux example

docker run -it --rm a12e/docker-qt:5.12-gcc_64

# Install required specific dependencies:
sudo apt-get -qq update && sudo apt-get install -qq -y libssl-dev
# Clone repo with source
git clone --recursive <repo> ~/src
# Make build dir & cd into
mkdir ~/build && cd ~/build
# Run qmake
qmake -r ~/src
# Run make
make
# Run make install 
make install INSTALL_ROOT=$HOME/appdir
# Prepare AppImage, deploy libs
linuxdeployqt appdir/usr/share/applications/*.desktop -bundle-non-qt-libs -qmldir=~/src/resources/ -extra-plugins=iconengines
# Optional: copy other files needed in the AppImage
mkdir -p appdir/usr/share/my-app/files/ && cp -v needed.file appdir/usr/share/my-app/files/
# Build the AppImage
linuxdeployqt appdir/usr/share/applications/*.desktop -appimage

Notes

OpenSSL for Android is compiled and installed directly in ${ANDROID_DEV}, and is platform-specific (API 21 in most cases). You can compile against it transparently, but you need to ship the libraries for run time. Look at ANDROID_EXTRA_LIBS.

Linux images are built inside a 16.04 LTS Ubuntu and not 18.04 LTS, to allow the AppImage's to be run on older systems. Otherwise, links to too recent versions of GLIBC are made.