toolchain

This repository produces a C toolchain with the following components:

• binutils
• linux headers
• libstdc++
• musl-libc
• gcc

The toolchain is configured to produce binaries with a search path set to /toolchain/lib. This allows for a clean separation from the host distribution on which the toolchain will be used.

We suggest using this toolchain to create an intermediate rootfs with the tools required to build source code. For example, make can be built using this toolchain, and it will be installed to /toolchain. Once a complete set of binaries are built and installed to /toolchain, the original host is no longer required to build source code. At that point you can set you $PATH to /toolchain/bin and build source code independent of the host distribution.

Development

The development of this toolchain depends on Docker 19.03.0 or greater and bldr. The toolchain can be built for different architectures (e.g. x86_64, aarch64, etc.). To do this you will need to setup the proper docker context for the architecture you intend on building for. For example, to setup the build for aarch64 (arm64):

docker context create arm64 \
    --description "An arm64 builder" \
    --docker "host=tcp://$IP:2376,ca=${HOME}/.docker/client/ca.pem,cert=${HOME}/.docker/client/cert.pem,key=${HOME}/.docker/client/key.pem"
docker buildx create \
    --use \
    --name arm64-builder \
    arm64

Note: You can run the above steps against an x86_64 machine, substituting arm64 with amd64.

Then, to build:

make USERNAME=${DOCKER_HUB_USERNAME} PLATFORM=linux/arm64 PUSH=true

Note: You can use PLATFORM=linux/amd64,linux/arm64 if you have configured docker with and amd64 and arm64 contexts.

Resources

• https://docs.docker.com/engine/security/https/#create-a-ca-server-and-client-keys-with-openssl
• https://gcc.gnu.org/onlinedocs/gccint/Configure-Terms.html
• https://wiki.osdev.org/Target_Triplet