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# Building with CMake
Some portions of this repository are portable beyond iOS and can be built using
CMake.
## Dependencies
You need:
* A C++ compiler
* `cmake`
### macOS
You need [Xcode](https://developer.apple.com/xcode/), which you can get from
the Mac App Store.
You can get other development tools via [homebrew](https://brew.sh). Adjust as
needed for other package managers.
```
brew install cmake
```
### Ubuntu
Ubuntu Trusty includes CMake 2.8.12 which should be sufficient. Newer versions
are fine too.
```
sudo apt-get install cmake
```
### Windows
An easy way to get development tools is via [Chocolatey](https://chocolatey.org/).
Unfortunately, the `cmake.install` package is semi-broken, so use the portable
version.
```
choco install cmake.portable
```
## Setup
CMake builds out-of source, so create a separate build directory for the target
you want to work on.
```
mkdir build
cd build
cmake ..
```
You only need to do this once.
## Initial Build
The first build will download, compile all dependencies of the project, and run
an initial battery of tests.
To perform the initial build, you can use CMake
```
cmake --build .
```
or use the underlying build system, e.g.
```
make -j all
```
## Working with a Project
Once the initial build has completed, you can work with a specific subproject
to make changes and test just that project in isolation.
For example, to work with just Firestore,
```
cd build/Firestore
make -j all test
```
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