iOSDevTH #21 - Speaker Deck

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Bazel for iOS 101

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What is Bazel 🥯 • Open source build system from Google • Internally, called blaze

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What is Build System Source code Source code Source code Source code Source code Build System Compiler Linker Binary

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XCBuild Source code Source code Source code Source code Source code XCBuild Compiler Linker Binary

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Foo.swift Baz.swift Bar.swift ⌘ + R Target MyApp MyApp scheme Target Foo Target Bar Target Baz

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⌘ + R MyApp Foo Bar Compiling Linking Copy f iles Codesigning Framework

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⌘ + R Task D Task B Task C Task A Input Output

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Cons of XCBuild Disclaimer: based on my experience

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Why? • Single artifacts directory per project • Switching git branch back and forth => caches invalidated 🫠 • 1 layer of cache

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Bazel advantages • Advanced local cache & remote cache • Optimized dependency analysis • Parallel execution

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Bazel dependencies Task D Task B Task C Task A Input Output

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Who use Bazel? uncon f irmed

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Bazel rules • Starlark language • python dialect

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How about Swift? • swift_library() • apple_resource_group() • ios_application()

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Demo

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LD IPA IDE XCBuild Compiler Linker Executable

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LD IPA IDE Bazel Compiler Linker Executable

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Xcode project generation Tulsi rules_xcodeproj

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Tulsi

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rules_xcodeproj

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Bazel cache

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Build Event Service (BES)

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Remote Execution

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When should I use Bazel Task Task Task Task Input Output Task Task Task Task Task Task Task Task Task

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When should I use Bazel Task Task Task Task Input Output Task Task Task Task Task Task Task Task Task

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Not convinced? • XCLogParser • XCMetrics • XCRemoteCache

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