How Build Cache for React Native works: caching the C++ your CI keeps recompiling

React Native builds for Android and iOS involve distinct processes for compiling different programming languages, with both platforms ultimately relying on C++ components. Aiming to streamline caching across these platforms, Bitrise introduced a unified command that activates multiple caches, including Gradle for Android's JVM tasks, Xcode for Swift in iOS, and ccache for shared C++ tasks. This integration allows developers to use a single command to manage caching without separately addressing platform-specific caches. The system employs a storage helper to bridge ccache’s protocol with Bitrise's backend, ensuring efficient cache management. Early tests showed significant build time reductions, with improvements up to 46% on Android and 40% on iOS. This innovation not only accelerates build processes but also simplifies monitoring and analysis by aggregating cache activity under a unified invocation ID in Bitrise Insights, allowing developers to track and optimize their workflows effectively.

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