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Adapted the README

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Added the information from the borrower of the dockcross script.
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Sven Fischer 2015-09-21 15:49:51 +02:00 committed by Roman Valls Guimera
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cross-compilers
===============
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
## Installation
This image is not intended to be run manually. Instead, there is a helper script which comes bundled with the image.
To install the helper script, run the image with no arguments, and redirect the output to a file.
eg.
```
docker run CROSS_COMPILER_IMAGE_NAME > dockcross
chmod +x dockcross
mv dockcross ~/bin/
```
## Usage
`dockcross [command] [args...]`
Execute the given command-line inside the container.
If the command matches one of the dockcross built-in commands (see below), that will be executed locally, otherwise the command is executed inside the container.
---
`dockcross -- [command] [args...]`
To force a command to run inside the container (in case of a name clash with a built-in command), use `--` before the command.
### Built-in commands
`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>
This file is sourced if it exists.
Default: `~/.dockcross`
### DOCKCROSS_IMAGE / --image <docker-image-name>
The docker image to run.
Default: sdt4docker/raspberry-pi-cross-compiler
### DOCKCROSS_ARGS / --args <docker-run-args>
Extra arguments to pass to the `docker run` command.
## Examples
`dockcross make`
Build the Makefile in the current directory.
---
`dockcross cmake -Bbuild -H. -GNinja`
Run CMake with a build directory "build" for the CMakeLists.txt in the current directory and generate `ninja` files.
`dockcross ninja -Cbuild`
Run ninja in the generated build directory.
---
`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...'`.
---
Credits go to sdt [sdt/docker-raspberry-pi-cross-compiler](https://github.com/sdt/docker-raspberry-pi-cross-compiler) on [GitHub](https://github.com), who invented the base of the `dockcross` script.