Gradle global ccache

init.gradle

// For every Gradle project that uses `com.android.application` or `com.android.library`,
// setup both ndk-build and CMake to use `ccache` as the compiler launcher if `ccache` is
// found in the user's $PATH environment
//
// Add to your project's build.gradle or install globally in your init.gradle: https://docs.gradle.org/current/userguide/init_scripts.html
gradle.projectsLoaded {
    rootProject.allprojects {
        afterEvaluate { project ->
            if (project.plugins.hasPlugin("com.android.application") || project.plugins.hasPlugin("com.android.library")) {
                def ccache = project.providers.exec {
                    commandLine "which", "ccache"
                    ignoreExitValue = true
                }.standardOutput.asText.getOrElse("").trim()
                if (ccache) {
                    project.android.defaultConfig.externalNativeBuild {
                        ndkBuild.arguments "NDK_CCACHE=$ccache"
                        cmake.arguments "-DCMAKE_C_COMPILER_LAUNCHER=$ccache", 
                                        "-DCMAKE_CXX_COMPILER_LAUNCHER=$ccache"
                    }
                }
            }
        }
    }
}