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209 lines
7.6 KiB
ReStructuredText
209 lines
7.6 KiB
ReStructuredText
dockcross
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=========
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Cross compiling toolchains in Docker images.
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Features
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--------
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* Different toolchains for cross compiling.
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* Commands in the container are run as the calling user, so that any created files have the expected ownership, (i.e. not root).
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* Make variables (`CC`, `LD` etc) are set to point to the appropriate tools in the container.
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* Recent `CMake <https://cmake.org>`_ and ninja are precompiled. Toolchain files available for CMake.
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* Current directory is mounted as the container's workdir, ``/work``.
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* Works with boot2docker on OSX and Docker for Mac beta (1.11.1-beta12).
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Cross compilers
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---------------
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.. image:: https://circleci.com/gh/dockcross/cross-compilers/tree/master.svg?style=svg
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:target: https://circleci.com/gh/dockcross/cross-compilers/tree/master
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.. |base-images| image:: https://badge.imagelayers.io/dockcross/base:latest.svg
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:target: https://imagelayers.io/?images=dockcross/base:latest
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dockcross/base
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|base-images| Base image for other toolchain images. From Debian Jessie with GCC,
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make, autotools, CMake, Ninja, Git, and Python.
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.. |android-arm-images| image:: https://badge.imagelayers.io/dockcross/android-arm:latest.svg
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:target: https://imagelayers.io/?images=dockcross/android-arm:latest
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dockcross/android-arm
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|android-arm-images| The Android NDK standalone toolchain for the arm
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architecture.
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.. |browser-asmjs-images| image:: https://badge.imagelayers.io/dockcross/browser-asmjs:latest.svg
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:target: https://imagelayers.io/?images=dockcross/browser-asmjs:latest
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dockcross/browser-asmjs
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|browser-asmjs-images| The Emscripten JavaScript cross compiler.
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.. |linux-arm64-images| image:: https://badge.imagelayers.io/dockcross/linux-arm64:latest.svg
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:target: https://imagelayers.io/?images=dockcross/linux-arm64:latest
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dockcross/linux-arm64
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|linux-arm64-images| Cross compiler for the 64-bit RM platform on Linux,
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also known as AArch64.
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.. |linux-armv5-images| image:: https://badge.imagelayers.io/dockcross/linux-armv5:latest.svg
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:target: https://imagelayers.io/?images=dockcross/linux-armv5:latest
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dockcross/linux-armv5
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|linux-armv5-images| Linux armv5 cross compiler toolchain for legacy devices
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like the Parrot AR Drone.
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.. |linux-armv6-images| image:: https://badge.imagelayers.io/dockcross/linux-armv6:latest.svg
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:target: https://imagelayers.io/?images=dockcross/linux-armv6:latest
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dockcross/linux-armv6
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|linux-armv6-images| Linux ARMv6 cross compiler toolchain for the Raspberry
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Pi, etc.
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.. |linux-armv7-images| image:: https://badge.imagelayers.io/dockcross/linux-armv7:latest.svg
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:target: https://imagelayers.io/?images=dockcross/linux-armv7:latest
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dockcross/linux-armv7
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|linux-armv7-images| Generic Linux armv7 cross compiler toolchain.
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.. |linux-ppc64le-images| image:: https://badge.imagelayers.io/dockcross/linux-ppc64le:latest.svg
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:target: https://imagelayers.io/?images=dockcross/linux-ppc64le:latest
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dockcross/linux-ppc64le
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|linux-ppc64le-images| Linux PowerPC 64 little endian cross compiler
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toolchain for the POWER8, etc.
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.. |linux-x64-images| image:: https://badge.imagelayers.io/dockcross/linux-x64:latest.svg
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:target: https://imagelayers.io/?images=dockcross/linux-x64:latest
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dockcross/linux-x64
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|linux-x64-images| Linux x86_64 / amd64 compiler. Since the Docker image is
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natively x86_64, this is not actually a cross compiler.
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.. |linux-x86-images| image:: https://badge.imagelayers.io/dockcross/linux-x86:latest.svg
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:target: https://imagelayers.io/?images=dockcross/linux-x86:latest
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dockcross/linux-x86
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|linux-x86-images| Linux i686 cross compiler.
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.. |windows-x64-images| image:: https://badge.imagelayers.io/dockcross/windows-x64:latest.svg
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:target: https://imagelayers.io/?images=dockcross/windows-x64:latest
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dockcross/windows-x64
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|windows-x64-images| 64-bit Windows cross-compiler based on MXE/MinGW-w64.
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.. |windows-x86-images| image:: https://badge.imagelayers.io/dockcross/windows-x86:latest.svg
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:target: https://imagelayers.io/?images=dockcross/windows-x86:latest
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dockcross/windows-x86
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|windows-x86-images| 32-bit Windows cross-compiler based on MXE/MinGW-w64.
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Installation
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------------
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This image does not need to be run manually. Instead, there is a helper script
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to execute build commands on source code existing on the local host filesystem. This
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script is bundled with the image.
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To install the helper script, run one of the images with no arguments, and
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redirect the output to a file::
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docker run --rm CROSS_COMPILER_IMAGE_NAME > ./dockcross
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chmod +x ./dockcross
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mv ./dockcross ~/bin/
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Where `CROSS_COMPILER_IMAGE_NAME` is the name of the cross-compiler toolchain
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Docker instance, e.g. `dockcross/linux-armv7`.
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Usage
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-----
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For the impatient, here's how to compile a hello world for armv7::
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cd ~/src/dockcross
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docker run --rm dockcross/linux-armv7 > ./dockcross-linux-armv7
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chmod +x ./dockcross-linux-armv7
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./dockcross-linux-armv7 bash -c '$CC test/C/hello.c -o hello_arm'
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Note how invoking any toolchain command (make, gcc, etc.) is just a matter of prepending the **dockcross** script on the commandline::
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./dockcross-linux-armv7 [command] [args...]
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The dockcross script will execute the given command-line inside the container,
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along with all arguments passed after the command. Commands that evaluate
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environmental variable in the image, like `$CC` above, should be exected in
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`bash -c`. The present working directory is mounted within the image, which
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can be used to make source code available in the Docker container.
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Built-in update commands
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------------------------
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A special update command can be exected that will update the
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source cross-compiler Docker image or the dockcross script itself.
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- ``dockcross [--] command [args...]``: Forces a command to run inside the container (in case of a name clash with a built-in command), use ``--`` before the command.
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- ``dockcross update-image``: Fetch the latest version of the docker image.
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- ``dockcross update-script``: Update the installed dockcross script with the one bundled in the image.
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- ``dockcross update``: Update both the docker image, and the dockcross script.
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Configuration
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-------------
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The following environmental variables and command-line options are used. In
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all cases, the command-line option overrides the environment variable.
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DOCKCROSS_CONFIG / --config|-c <path-to-config-file>
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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This file is sourced, if it exists, before executing the rest of the dockcross
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script.
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Default: ``~/.dockcross``
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DOCKCROSS_IMAGE / --image|-i <docker-image-name>
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The Docker cross-compiler image to run.
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Default: Image with which the script was created.
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DOCKCROSS_ARGS / --args|-a <docker-run-args>
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Extra arguments to pass to the ``docker run`` command.
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Examples
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--------
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1. **dockcross make**: Build the Makefile in the current directory.
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2. **dockcross cmake -Bbuild -H. -GNinja***: Run CMake with a build directory "build" for the CMakeLists.txt in the current directory and generate `ninja` files.
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3. **dockcross ninja -Cbuild**: Run ninja in the generated build directory.
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4. **dockcross bash -c '$CC test/C/hello.c -o hello'** Build the hello.c file
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with the compiler identified with the `CC` environmental variable in the
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build environment.
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5. **dockcross bash**. Run a shell in the build environment.
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Note that commands are executed verbatim. If any shell processing for
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environment variable expansion or redirection is required, please use
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`bash -c 'command args...'`.
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---
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Credits go to `sdt/docker-raspberry-pi-cross-compiler <https://github.com/sdt/docker-raspberry-pi-cross-compiler>`_, who invented the base of the **dockcross** script.
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