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doc: README formatting

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Matt McCormick 2016-07-03 22:20:01 -04:00
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@ -6,12 +6,12 @@ Dockerfiles for cross compiling in a Docker container.
Features
========
* different toolchains for cross compiling
* commands in the container are run as the calling user, so that any created files have the expected ownership (ie. not root)
* make variables (`CC`, `LD` etc) are set to point to the appropriate tools in the container
* cmake and ninja are precompiled available with a toolchain file for cmake
* current directory is mounted as the container's workdir, `/build`
* works with boot2docker on OSX and Docker for Mac beta (1.11.1-beta12)
* Different toolchains for cross compiling.
* Commands in the container are run as the calling user, so that any created files have the expected ownership, (i.e. not root).
* Make variables (`CC`, `LD` etc) are set to point to the appropriate tools in the container.
* Recent cmake and ninja are precompiled. Toolchain files available for cmake.
* Current directory is mounted as the container's workdir, ``/build``.
* Works with boot2docker on OSX and Docker for Mac beta (1.11.1-beta12).
Installation
============
@ -20,52 +20,55 @@ This image is not intended to be run manually. Instead, there is a helper script
To install the helper script, run the image with no arguments, and redirect the output to a file::
docker run CROSS_COMPILER_IMAGE_NAME > dockcross
chmod +x dockcross
mv dockcross ~/bin/
docker run CROSS_COMPILER_IMAGE_NAME > dockcross
chmod +x dockcross
mv dockcross ~/bin/
Usage
=====
For the impatient, here's a one-liner to compile a hello world for armv7::
docker run thewtex/cross-compiler-linux-armv7 > dockcross && chmod +x dockcross && ./dockcross gcc test/C/hello.c -o hello_arm
docker run thewtex/cross-compiler-linux-armv7 > dockcross && chmod +x dockcross && ./dockcross gcc test/C/hello.c -o hello_arm
Note how invoking any toolchain command (make, gcc, etc...) is just a matter of prepending **dockcross** in the commandline:
Note how invoking any toolchain command (make, gcc, etc...) is just a matter of prepending **dockcross** in the commandline::
`dockcross [command] [args...]`
dockcross [command] [args...]
Dockcross will thus execute the given command-line inside the container, along with all arguments passed after the command.
The dockcross script will execute the given command-line inside the container, along with all arguments passed after the command.
Alternatively, if the command matches one of the dockcross built-in commands (see below), that will be executed locally.
Alternatively, if the command matches one of the dockcross built-in commands (see below), they will be executed locally.
Built-in commands
=================
- `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.
- `dockcross update-image`: Fetch the latest version of the docker image.
- `dockcross update-script`: Update the installed dockcross script with the one bundled in the image.
- `dockcross update`: Update both the docker image, and the dockcross script.
- ``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.
- ``dockcross update-image``: Fetch the latest version of the docker image.
- ``dockcross update-script``: Update the installed dockcross script with the one bundled in the image.
- ``dockcross update``: Update both the docker image, and the dockcross script.
Configuration
=============
The following command-line options and environment variables are used. In all cases, the command-line option overrides the environment variable.
### DOCKCROSS_CONFIG / --config <path-to-config-file>
DOCKCROSS_CONFIG / --config <path-to-config-file>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This file is sourced if it exists.
Default: `~/.dockcross`
Default: ``~/.dockcross``
### DOCKCROSS_IMAGE / --image <docker-image-name>
DOCKCROSS_IMAGE / --image <docker-image-name>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The docker image to run.
Default: thewtex/cross-compiler-linux-armv7
### DOCKCROSS_ARGS / --args <docker-run-args>
DOCKCROSS_ARGS / --args <docker-run-args>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Extra arguments to pass to the `docker run` command.
@ -77,11 +80,11 @@ Examples
3. **dockcross ninja -Cbuild**: Run ninja in the generated build directory.
4. **dockcross bash -c 'find . -name \*.o | sort > objects.txt'**
Note that commands are executed verbatim. If you require any shell processing for environment variable expansion or redirection, please use `bash -c 'command args...'`.
Note that commands are executed verbatim. If you require any shell processing for environment variable expansion or redirection, please use ``bash -c 'command args...'``.
---
Credits go to `sdt/docker-raspberry-pi-cross-compiler <https://github.com/sdt/docker-raspberry-pi-cross-compiler>`_, who invented the base of this **dockcross** script.
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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