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Configure and build Fuchsia

To build Fuchsia, you need to be able to run the fx command in your terminal.

Set build configuration

To set your build configuration for Fuchsia, run the following command:

fx set <var>product</var>.<var>board</var>

The fx set command takes PRODUCT and BOARD arguments, which define the product and board configuration of your build. This configuration informs the build system what packages to build for your Fuchsia device.

For the core set of Fuchsia features, the build configuration is

fx set core.x64

where core is a product with a minimal feature set, which includes common network capabilities, and x64 refers to the x64 architecture.

For a Fuchsia emulator with the core set of Fuchsia features, the build configuration is

fx set core.qemu-x64

See Configure a build for more options.

Speed up the build

To reduce the time it takes to build Fuchsia, you can do any of the following:

Speed up the build with Goma

Goma is a distributed compiler service for open source projects such as Chrome, Android and Fuchsia. If you have access to Goma, run the following command to enable a Goma client on your machine:

fx goma

Speed up the build with ccache

If you do not have access to Goma, but want to accelerate the Fuchsia build locally, use ccache to cache artifacts from previous builds.

To use ccache on Linux, install the following package:

sudo apt-get install ccache

For macOS, see Using CCache on Mac for installation instructions.

ccache is enabled automatically if your CCACHE_DIR environment variable refers to an existing directory.

To override the default behavior, pass the following flags to fx set:

  • Force use of ccache even if other accelerators are available:

    fx set core.x64 --ccache
  • Disable use of ccache:

    fx set core.x64 --no-ccache

Build Fuchsia

To build Fuchsia, run the following command:

fx build

The fx build command executes the build to transform source code into packages and other build artifacts.

If you modify source code, re-run the fx build command to perform an incremental build, or run the fx -i build command to start a watcher, which automatically builds whenever you update source code.

See Execute a build for more information.

Next steps