Docker Cross-Compiling Toolchains

As dockcross (or crosstool-ng) doesn't seem to actually use the configured glibc version, let's just build our own docker containers with a linux ARM cross-compiler.

Usage

Docker containers are pushed to the GitHub container registry (ghcr.io) by a build pipeline on new tags. All dockerfiles support these build tools:

• GNU make
• Python 3
• CMake (with Ninja)

To cross-compile something, mount the working directory to /work and run your make command like this:

docker run --rm -v $(pwd):/work ghcr.io/considerit/cross-linux-armhf-debian11 make $target

To cross-compile with CMake, a toolchain file is used which expects libraries in $CROSS_SYSROOT/lib and includes in $CROSS_SYSROOT/include.

# add -DCMAKE_TOOLCHAIN_FILE=/var/cross-sysroot/toolchain.cmake to your cmake call or use wrapper script on config step
docker run --rm -v $(pwd):/work ghcr.io/considerit/cross-linux-armhf-debian11 cmake-cross -B ./build-armhf

docker run --rm -v $(pwd):/work ghcr.io/considerit/cross-linux-armhf-debian11 cmake --build ./build-armhf

If you want to build the images yourself, run docker build on the individual dockerfiles like this:

cd linux-gnueabihf-debian11
docker build -t $some_useful_name .

Don't forget to replace the ghcr.io name with your tag in the docker run command.

Images and Library Versions

Image	arch	gcc	glibc
linux-aarch64-debian11	aarch64	10	2.31
linux-armhf-ubuntu18	armhf	7	2.27
linux-armhf-debian10	armhf	8	2.28
linux-armhf-debian11	armhf	10	2.31