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Alice (1):
      refactor(docs): Fix grammer and wording in the cross-compile guide
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# Cross-compile from Linux # Cross-compile from Linux to Windows
## Intro ## Intro
Following these instructions you will be able to cross-compile qTox to Windows. Following these instructions will show you how to cross-compile qTox for Windows.
This script can be used by qTox power users to cross-compile qTox themselves,as This script can be used by qTox users and devs to compile qTox for windows themselves.
well as by qTox developers to make sure their local changes don't break
cross-compilation to Windows.
Note that the compilation script doesn't build the updater and doesn't produce Please note that the compilation script doesn't build the updater and doesn't produce
an installer. an installer.
## Usage ## Usage
[Install Docker](https://docs.docker.com/engine/installation/linux/).
You should have 3 directories available (names don't have to match the given #### 1. [Install Docker](https://docs.docker.com/install).
ones): ***
1. `workspace` -- a directory that will contain a cache of qTox dependencies
#### 2. Create 3 directories for storing the files needed for cross-compiling.
***
* `workspace` -- a directory that will contain a cache of qTox dependencies
and the final qTox cross-compilation build. You should create this directory. and the final qTox cross-compilation build. You should create this directory.
2. `script` -- a directory that contains the `build.sh` script. You can use
this directory for this, there is no need to create a new one. * `script` -- a directory that contains the `build.sh` script.
3. `qtox` -- a root directory of a qTox repository. This directory contains Copy the `build.sh` script to this folder.
qTox source code that will be cross-compiled. You can use the root of this qTox
repository, there is no need to create a new one. * `qtox` -- the root directory of a qTox repository. This directory must contain
the qTox source code that will be cross-compiled. You can use an existing qTox
directory you've been using for development or check one out using
`git clone https://github.com/qTox/qTox.git folder-name`
These directories will be mounted inside a Docker container at`/workspace`, These directories will be mounted inside a Docker container at`/workspace`,
`/script`and`/qtox`. `/script`and`/qtox`.
The contents of `qtox` and `script` directories wouldn't be modified. The The contents of `qtox` and `script` directories are not modified during compilation. The
`build.sh` script actually makes a copy of `qtox` directory and works on that `build.sh` script makes a temporary copy of the `qtox` directory for compilation.
copy.
Once you sort out the directories, you are ready to run the `build.sh` script
in a Docker container.
Note that the `build.sh` script takes 2 arguments: architecture and build type. #### 3. Create the docker container and run the build script.
Valid values for the architecture are `i686` for 32-bit and `x86_64` for ***
64-bit. Valid values for the build type are `release` and `debug`. All case > Note that the`build.sh`script takes 2 arguments: architecture and build type.
sensitive. > Valid values for the architecture are `i686` for 32-bit and `x86_64` for
> 64-bit. Valid values for the build type are `release` and `debug`. All case
> sensitive. You can modify the scripts below to fit your use case.
> To create the docker container and start cross-compiling run
Now, to start the cross-compilation, for example, for a 32-bit release qTox, run
```sh ```sh
sudo docker run --rm \ sudo docker run --rm \
@ -52,34 +56,41 @@ sudo docker run --rm \
/bin/bash /script/build.sh i686 release /bin/bash /script/build.sh i686 release
``` ```
If you are a qTox developer, you might want to instead run
If you are a qTox developer, you might want to enable tty and leave stdin open by running the following script instead.
```sh ```sh
# Get shell inside Debian Stretch container so that you can poke around if needed
sudo docker run -it \ sudo docker run -it \
--rm \ --rm \
-v /absolute/path/to/your/workspace:/workspace \ -v /absolute/path/to/your/workspace:/workspace \
-v /absolute/path/to/your/script:/script \ -v /absolute/path/to/your/script:/script \
-v /absolute/path/to/your/qtox:/qtox \ -v /absolute/path/to/your/qtox:/qtox \
debian:stretch-slim \ debian:stretch-slim \
/bin/bash /bin/bash /script/build.sh i686 release
# Run the script
bash /script/build.sh i686 release
``` ```
These will cross-compile all of the qTox dependencies and qTox itself, storing
This will cross-compile all of the qTox dependencies and qTox itself, storing
them in the `workspace` directory. The first time you run it for each them in the `workspace` directory. The first time you run it for each
architecture, it will take a long time for the cross-compilation to finish, as architecture, it will take a long time for the cross-compilation to finish, as
qTox has a lot of dependencies that need to be cross-compiled. It takes my qTox has a lot of dependencies that need to be cross-compiled.
Intel Core i7 processor about 125 minutes for the cross-compilation to get done
on a single core, and about 30 minutes using all 8 hyperthreads. But once you
do it once for each architecture, the dependencies will get cached inside the
`workspace` directory, and the next time you build qTox, the `build.sh` script
will skip recompiling them, going straight to compiling qTox, which is a lot
faster -- about 8 minutes on a single core and 2 minutes using 8 hyperthreads.
The structure of `workspace` directory that the `build.sh` script will create
is as follows: > Note that it takes my Intel Core i7 processor about 125 minutes on average for the cross-compilation
> to finish on a single core, and about 30 minutes using all 8 hyperthreads. Once you've compiled
> it, the dependencies will be cached inside the `workspace` directory. The next time
> you build qTox, the `build.sh` script will skip recompiling them
> which is a lot faster -- about 8 minutes on a single core and 2 minutes using 8 hyperthreads.
#### 4. After cross-compiling has finished
***
The `workspace\i686\qtox` and `workspace\x86_64\qtox\`directories will contain the compiled binaries in their respective debug or release folder depending on the compilation settings you chose in Step 3.
The `dep-cache` directory is where all the cross-compiled qTox dependencies will be
cached for the future builds. You can remove any directory inside the `deps` folder, which
will result in the `build.sh` re-compiling the removed dependency.
_The `workspace` direcory structure for reference_
``` ```
workspace workspace
@ -116,10 +127,3 @@ workspace
├── debug ├── debug
└── release └── release
``` ```
The `dep-cache` directory is where all cross-compiled qTox dependencies will be
cached for the future runs. You can remove any directory inside `deps`, which
will result in the `build.sh` re-compiling the missing dependency.
The `qtox` directory, split into `debug` and `release`, is where the
cross-compiled qTox will be stored.