Docker images for CI

This folder contains a bunch of docker images used by the continuous integration (CI) of Rust. An script is accompanied (run.sh) with these images to actually execute them. To test out an image execute:

./src/ci/docker/run.sh $image_name

for example:

./src/ci/docker/run.sh x86_64-gnu

Images will output artifacts in an obj dir at the root of a repository.

Cross toolchains

A number of these images take quite a long time to compile as they're building whole gcc toolchains to do cross builds with. Much of this is relatively self-explanatory but some images use crosstool-ng which isn't quite as self explanatory. Below is a description of where these *.config files come form, how to generate them, and how the existing ones were generated.

Generating a .config file

If you have a linux-cross image lying around you can use that and skip the next two steps.

• First we spin up a container and copy build_toolchain_root.sh into it. All these steps are outside the container:

# Note: We use ubuntu:15.10 because that's the "base" of linux-cross Docker
# image
$ docker run -it ubuntu:15.10 bash
$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
cfbec05ed730        ubuntu:15.10        "bash"              16 seconds ago      Up 15 seconds                           drunk_murdock
$ docker cp build_toolchain_root.sh drunk_murdock:/

• Then inside the container we build crosstool-ng by simply calling the bash script we copied in the previous step:

$ bash build_toolchain_root.sh

• Now, inside the container run the following command to configure the toolchain. To get a clue of which options need to be changed check the next section and come back.

$ ct-ng menuconfig

• Finally, we retrieve the .config file from the container and give it a meaningful name. This is done outside the container.

$ docker drunk_murdock:/.config arm-linux-gnueabi.config

• Now you can shutdown the container or repeat the two last steps to generate a new .config file.

Toolchain configuration

Changes on top of the default toolchain configuration used to generate the .config files in this directory. The changes are formatted as follows:

$category > $option = $value -- $comment

arm-linux-gnueabi.config

For targets: arm-unknown-linux-gnueabi

• Path and misc options > Prefix directory = /x-tools/${CT_TARGET}
• Target options > Target Architecture = arm
• Target options > Architecture level = armv6 -- (+)
• Target options > Floating point = software (no FPU) -- (*)
• Operating System > Target OS = linux
• Operating System > Linux kernel version = 3.2.72 -- Precise kernel
• C-library > glibc version = 2.14.1
• C compiler > gcc version = 4.9.3
• C compiler > C++ = ENABLE -- to cross compile LLVM

arm-linux-gnueabihf.config

For targets: arm-unknown-linux-gnueabihf

• Path and misc options > Prefix directory = /x-tools/${CT_TARGET}
• Target options > Target Architecture = arm
• Target options > Architecture level = armv6 -- (+)
• Target options > Use specific FPU = vfp -- (+)
• Target options > Floating point = hardware (FPU) -- (*)
• Target options > Default instruction set mode = arm -- (+)
• Operating System > Target OS = linux
• Operating System > Linux kernel version = 3.2.72 -- Precise kernel
• C-library > glibc version = 2.14.1
• C compiler > gcc version = 4.9.3
• C compiler > C++ = ENABLE -- to cross compile LLVM

armv7-linux-gnueabihf.config

For targets: armv7-unknown-linux-gnueabihf

• Path and misc options > Prefix directory = /x-tools/${CT_TARGET}
• Target options > Target Architecture = arm
• Target options > Suffix to the arch-part = v7
• Target options > Architecture level = armv7-a -- (+)
• Target options > Use specific FPU = vfpv3-d16 -- (*)
• Target options > Floating point = hardware (FPU) -- (*)
• Target options > Default instruction set mode = thumb -- (*)
• Operating System > Target OS = linux
• Operating System > Linux kernel version = 3.2.72 -- Precise kernel
• C-library > glibc version = 2.14.1
• C compiler > gcc version = 4.9.3
• C compiler > C++ = ENABLE -- to cross compile LLVM

(*) These options have been selected to match the configuration of the arm toolchains shipped with Ubuntu 15.10 (+) These options have been selected to match the gcc flags we use to compile C libraries like jemalloc. See the mk/cfg/arm(v7)-uknown-linux-gnueabi{,hf}.mk file in Rust's source code.

aarch64-linux-gnu.config

For targets: aarch64-unknown-linux-gnu

• Path and misc options > Prefix directory = /x-tools/${CT_TARGET}
• Target options > Target Architecture = arm
• Target options > Bitness = 64-bit
• Operating System > Target OS = linux
• Operating System > Linux kernel version = 4.2.6
• C-library > glibc version = 2.17 -- aarch64 support was introduced in this version
• C compiler > gcc version = 5.2.0
• C compiler > C++ = ENABLE -- to cross compile LLVM

powerpc-linux-gnu.config

For targets: powerpc-unknown-linux-gnu

• Path and misc options > Prefix directory = /x-tools/${CT_TARGET}
• Path and misc options > Patches origin = Bundled, then local
• Path and misc options > Local patch directory = /tmp/patches
• Target options > Target Architecture = powerpc
• Target options > Emit assembly for CPU = powerpc -- pure 32-bit PowerPC
• Operating System > Target OS = linux
• Operating System > Linux kernel version = 2.6.32.68 -- ~RHEL6 kernel
• C-library > glibc version = 2.12.2 -- ~RHEL6 glibc
• C compiler > gcc version = 4.9.3
• C compiler > C++ = ENABLE -- to cross compile LLVM

powerpc64-linux-gnu.config

For targets: powerpc64-unknown-linux-gnu

• Path and misc options > Prefix directory = /x-tools/${CT_TARGET}
• Path and misc options > Patches origin = Bundled, then local
• Path and misc options > Local patch directory = /tmp/patches
• Target options > Target Architecture = powerpc
• Target options > Bitness = 64-bit
• Target options > Emit assembly for CPU = power4 -- (+)
• Target options > Tune for CPU = power6 -- (+)
• Operating System > Target OS = linux
• Operating System > Linux kernel version = 2.6.32.68 -- ~RHEL6 kernel
• C-library > glibc version = 2.12.2 -- ~RHEL6 glibc
• C compiler > gcc version = 4.9.3
• C compiler > C++ = ENABLE -- to cross compile LLVM

(+) These CPU options match the configuration of the toolchains in RHEL6.

s390x-linux-gnu.config

For targets: s390x-unknown-linux-gnu

• Path and misc options > Prefix directory = /x-tools/${CT_TARGET}
• Path and misc options > Patches origin = Bundled, then local
• Path and misc options > Local patch directory = /build/patches
• Target options > Target Architecture = s390
• Target options > Bitness = 64-bit
• Operating System > Target OS = linux
• Operating System > Linux kernel version = 2.6.32.68 -- ~RHEL6 kernel
• C-library > glibc version = 2.12.2 -- ~RHEL6 glibc
• C compiler > gcc version = 4.9.3
• C compiler > gcc extra config = --with-arch=z10 -- LLVM's minimum support
• C compiler > C++ = ENABLE -- to cross compile LLVM