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build: introduce a CMake based build
This enables building DocC as a CMake project. Doing so is motivated by toolchain build times. By using CMake instead of SPM, we see an overall reduction of ~7% in the total toolchain build time on Windows.
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‎CMakeLists.txt‎

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#[[
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This source file is part of the Swift open source project
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Copyright © 2014 - 2025 Apple Inc. and the Swift project authors
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Licensed under Apache License v2.0 with Runtime Library Exception
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See https://swift.org/LICENSE.txt for license information
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]]
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cmake_minimum_required(VERSION 3.24)
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project(SymbolKit
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LANGUAGES Swift)
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set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
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set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
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set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
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set(CMAKE_Swift_MODULE_DIRECTORY ${CMAKE_BINARY_DIR}/swift)
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set(CMAKE_Swift_COMPILE_OPTIONS_MSVC_RUNTIME_LIBRARY MultiThreadedDLL)
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add_subdirectory(Sources)
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add_subdirectory(cmake/modules)

‎Sources/CMakeLists.txt‎

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#[[
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This source file is part of the Swift open source project
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Copyright © 2014 - 2025 Apple Inc. and the Swift project authors
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Licensed under Apache License v2.0 with Runtime Library Exception
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See https://swift.org/LICENSE.txt for license information
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]]
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add_subdirectory(SymbolKit)

‎Sources/SymbolKit/CMakeLists.txt‎

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#[[
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This source file is part of the Swift open source project
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Copyright © 2014 - 2025 Apple Inc. and the Swift project authors
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Licensed under Apache License v2.0 with Runtime Library Exception
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See https://swift.org/LICENSE.txt for license information
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]]
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add_library(SymbolKit
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Package.swift
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Sources/SymbolKit/Mixin/Mixin+Equals.swift
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Sources/SymbolKit/Mixin/Mixin+Hash.swift
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Sources/SymbolKit/Mixin/Mixin.swift
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Sources/SymbolKit/SymbolGraph/AnyScalar.swift
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Sources/SymbolKit/SymbolGraph/LineList/LineList.swift
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Sources/SymbolKit/SymbolGraph/LineList/SourceRange/Position.swift
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Sources/SymbolKit/SymbolGraph/LineList/SourceRange/SourceRange.swift
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Sources/SymbolKit/SymbolGraph/Metadata.swift
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Sources/SymbolKit/SymbolGraph/Module.swift
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Sources/SymbolKit/SymbolGraph/OperatingSystem.swift
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Sources/SymbolKit/SymbolGraph/Platform.swift
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Sources/SymbolKit/SymbolGraph/Relationship/ReferenceLocation.swift
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Sources/SymbolKit/SymbolGraph/Relationship/Relationship.swift
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Sources/SymbolKit/SymbolGraph/Relationship/RelationshipKind.swift
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Sources/SymbolKit/SymbolGraph/Relationship/SourceOrigin.swift
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Sources/SymbolKit/SymbolGraph/Relationship/Swift/GenericConstraints.swift
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Sources/SymbolKit/SymbolGraph/Relationship/Swift/Swift.swift
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Sources/SymbolKit/SymbolGraph/SemanticVersion.swift
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Sources/SymbolKit/SymbolGraph/Symbol/AccessControl.swift
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Sources/SymbolKit/SymbolGraph/Symbol/AlternateDeclarations.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Availability/Availability.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Availability/AvailabilityItem.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Availability/Domain.swift
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Sources/SymbolKit/SymbolGraph/Symbol/DeclarationFragments/DeclarationFragments+Simplify.swift
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Sources/SymbolKit/SymbolGraph/Symbol/DeclarationFragments/DeclarationFragments.swift
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Sources/SymbolKit/SymbolGraph/Symbol/DeclarationFragments/Fragment/Fragment.swift
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Sources/SymbolKit/SymbolGraph/Symbol/DeclarationFragments/Fragment/FragmentKind.swift
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Sources/SymbolKit/SymbolGraph/Symbol/FunctionSignature/FunctionParameter.swift
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Sources/SymbolKit/SymbolGraph/Symbol/FunctionSignature/FunctionSignature.swift
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Sources/SymbolKit/SymbolGraph/Symbol/HTTP/HTTP.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Identifier.swift
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Sources/SymbolKit/SymbolGraph/Symbol/KindIdentifier.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Location.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Mutability.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Names.swift
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Sources/SymbolKit/SymbolGraph/Symbol/OverloadData.swift
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Sources/SymbolKit/SymbolGraph/Symbol/PlistDetails.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Snippet.swift
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Sources/SymbolKit/SymbolGraph/Symbol/SPI.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Swift/Extension.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Swift/GenericConstraint.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Swift/GenericParameter.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Swift/Generics.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Swift/Namespace.swift
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Sources/SymbolKit/SymbolGraph/Symbol/Symbol.swift
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Sources/SymbolKit/SymbolGraph/Symbol/SymbolKind.swift
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Sources/SymbolKit/SymbolGraph/Symbol/ValueConstraints.swift
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Sources/SymbolKit/SymbolGraph/SymbolGraph+Overloads.swift
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Sources/SymbolKit/SymbolGraph/SymbolGraph.swift
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Sources/SymbolKit/UnifiedSymbolGraph/GraphCollector.swift
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Sources/SymbolKit/UnifiedSymbolGraph/UnifiedSymbol+Encodable.swift
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Sources/SymbolKit/UnifiedSymbolGraph/UnifiedSymbol.swift
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Sources/SymbolKit/UnifiedSymbolGraph/UnifiedSymbolGraph+Encodable.swift
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Sources/SymbolKit/UnifiedSymbolGraph/UnifiedSymbolGraph+Overloads.swift
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Sources/SymbolKit/UnifiedSymbolGraph/UnifiedSymbolGraph.swift
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Tests/SymbolKitTests/SymbolGraph/AnyScalarTests.swift
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Tests/SymbolKitTests/SymbolGraph/LineList/LineListTests.swift
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Tests/SymbolKitTests/SymbolGraph/LineList/SemanticVersionTests.swift
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Tests/SymbolKitTests/SymbolGraph/ModuleTests.swift
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Tests/SymbolKitTests/SymbolGraph/PlatformTests.swift
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Tests/SymbolKitTests/SymbolGraph/Relationship/HashableTests.swift
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Tests/SymbolKitTests/SymbolGraph/Relationship/ReferenceLocationTests.swift
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Tests/SymbolKitTests/SymbolGraph/Symbol/DeclarationFragments+SimplifyTests.swift
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Tests/SymbolKitTests/SymbolGraph/Symbol/FunctionSignatureTests.swift
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Tests/SymbolKitTests/SymbolGraph/Symbol/HTTPTests.swift
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Tests/SymbolKitTests/SymbolGraph/Symbol/PlistDetailsTests.swift
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Tests/SymbolKitTests/SymbolGraph/Symbol/Swift/GenericConstraintTests.swift
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Tests/SymbolKitTests/SymbolGraph/Symbol/SymbolKindTests.swift
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Tests/SymbolKitTests/SymbolGraph/Symbol/ValueConstraintsTests.swift
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Tests/SymbolKitTests/SymbolGraph/SymbolGraph+OverloadsTests.swift
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Tests/SymbolKitTests/SymbolGraph/SymbolGraphCreationTests.swift
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Tests/SymbolKitTests/SymbolGraph/SymbolGraphTests.swift
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Tests/SymbolKitTests/SymbolGraph/SymbolTests.swift
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Tests/SymbolKitTests/UnifiedGraph/CrossImportOverlaySymbolGraphs.swift
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Tests/SymbolKitTests/UnifiedGraph/GraphCollectorTests.swift
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Tests/SymbolKitTests/UnifiedGraph/UnifiedGraph+OverloadsTests.swift
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Tests/SymbolKitTests/UnifiedGraph/UnifiedGraphTests.swift
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Tests/SymbolKitTests/UnifiedGraph/UnifiedSymbolTests.swift
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Tools/dump-unified-graph/DumpUnifiedGraph.swift
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Tools/Package.swift)
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set_target_properties(SymbolKit PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_Swift_MODULE_DIRECTORY})
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set_property(GLOBAL APPEND PROPERTY SYMBOLKIT_EXPORTS SymbolKit)

‎cmake/modules/CMakeLists.txt‎

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#[[
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This source file is part of the Swift open source project
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Copyright © 2014 - 2025 Apple Inc. and the Swift project authors
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Licensed under Apache License v2.0 with Runtime Library Exception
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See https://swift.org/LICENSE.txt for license information
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]]
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set(SYMBOLKIT_EXPORTS_FILE
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${CMAKE_CURRENT_BINARY_DIR}/SymbolKitExports.cmake)
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configure_file(SymbolKitConfig.cmake.in
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${CMAKE_CURRENT_BINARY_DIR}/SymbolKitConfig.cmake)
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get_property(SYMBOLKIT_EXPORTS GLOBAL PROPERTY SYMBOLKIT_EXPORTS)
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export(TARGETS ${SYMBOLKIT_EXPORTS}
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NAMESPACE DocC::
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FILE ${SYMBOLKIT_EXPORTS_FILE}
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EXPORT_LINK_INTERFACE_LIBRARIES)

‎cmake/modules/SymbolKitConfig.cmake.in‎

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#[[
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This source file is part of the Swift open source project
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Copyright © 2014 - 2025 Apple Inc. and the Swift project authors
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Licensed under Apache License v2.0 with Runtime Library Exception
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See https://swift.org/LICENSE.txt for license information
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]]
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if(NOT TARGET DocC::SymbolKit)
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include("@SYMBOLKIT_EXPORTS_FILE@")
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endif()

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