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build: add a CMake based build
This adds a CMake based build for supporting platforms where swift-package-manager is not yet ready. This enables building swift-protobuf on Windows.
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‎CMakeLists.txt

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cmake_minimum_required(VERSION 3.16)
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project(protobuf
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LANGUAGES Swift)
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list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/modules)
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set(CMAKE_Swift_MODULE_DIRECTORY ${CMAKE_BINARY_DIR}/swift)
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include(SwiftSupport)
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add_subdirectory(Sources)

‎Sources/CMakeLists.txt

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add_subdirectory(SwiftProtobuf)
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add_subdirectory(swiftProtobufPluginLibrary)
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add_subdirectory(protoc-gen-swift)

‎Sources/SwiftProtobuf/CMakeLists.txt

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add_library(SwiftProtobuf
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any.pb.swift
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AnyMessageStorage.swift
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AnyUnpackError.swift
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api.pb.swift
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BinaryDecoder.swift
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BinaryDecodingError.swift
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BinaryDecodingOptions.swift
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BinaryDelimited.swift
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BinaryEncoder.swift
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BinaryEncodingError.swift
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BinaryEncodingSizeVisitor.swift
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BinaryEncodingVisitor.swift
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CustomJSONCodable.swift
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Data+Extensions.swift
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Decoder.swift
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descriptor.pb.swift
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DoubleParser.swift
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duration.pb.swift
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empty.pb.swift
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Enum.swift
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ExtensibleMessage.swift
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ExtensionFields.swift
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ExtensionFieldValueSet.swift
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ExtensionMap.swift
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FieldTag.swift
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FieldTypes.swift
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field_mask.pb.swift
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Google_Protobuf_Any+Extensions.swift
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Google_Protobuf_Any+Registry.swift
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Google_Protobuf_Duration+Extensions.swift
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Google_Protobuf_FieldMask+Extensions.swift
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Google_Protobuf_ListValue+Extensions.swift
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Google_Protobuf_Struct+Extensions.swift
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Google_Protobuf_Timestamp+Extensions.swift
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Google_Protobuf_Value+Extensions.swift
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Google_Protobuf_Wrappers+Extensions.swift
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HashVisitor.swift
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Internal.swift
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JSONDecoder.swift
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JSONDecodingError.swift
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JSONDecodingOptions.swift
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JSONEncoder.swift
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JSONEncodingError.swift
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JSONEncodingOptions.swift
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JSONEncodingVisitor.swift
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JSONMapEncodingVisitor.swift
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JSONScanner.swift
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MathUtils.swift
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Message+AnyAdditions.swift
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Message+BinaryAdditions.swift
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Message+JSONAdditions.swift
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Message+JSONArrayAdditions.swift
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Message+TextFormatAdditions.swift
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Message.swift
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MessageExtension.swift
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NameMap.swift
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ProtobufAPIVersionCheck.swift
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ProtobufMap.swift
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ProtoNameProviding.swift
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SelectiveVisitor.swift
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SimpleExtensionMap.swift
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source_context.pb.swift
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StringUtils.swift
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struct.pb.swift
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TextFormatDecoder.swift
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TextFormatDecodingError.swift
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TextFormatEncoder.swift
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TextFormatEncodingOptions.swift
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TextFormatEncodingVisitor.swift
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TextFormatScanner.swift
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timestamp.pb.swift
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TimeUtils.swift
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type.pb.swift
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UnknownStorage.swift
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UnsafeBufferPointer+Shims.swift
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UnsafeRawPointer+Shims.swift
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Varint.swift
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Version.swift
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Visitor.swift
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WireFormat.swift
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wrappers.pb.swift
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ZigZag.swift)
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set_target_properties(SwiftProtobuf PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_Swift_MODULE_DIRECTORY})
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install(TARGETS SwiftProtobuf
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ARCHIVE DESTINATION lib/swift$<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:_static>/$<LOWER_CASE:${CMAKE_SYSTEM_NAME}>
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LIBRARY DESTINATION lib/swift$<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:_static>/$<LOWER_CASE:${CMAKE_SYSTEM_NAME}>
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RUNTIME DESTINATION bin)
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get_swift_host_arch(swift_arch)
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install(FILES
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$<TARGET_PROPERTY:SwiftProtobuf,Swift_MODULE_DIRECTORY>/SwiftProtobuf.swiftdoc
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$<TARGET_PROPERTY:SwiftProtobuf,Swift_MODULE_DIRECTORY>/SwiftProtobuf.swiftmodule
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DESTINATION lib/swift$<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:_static>/$<LOWER_CASE:${CMAKE_SYSTEM_NAME}>/${swift_arch})
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set_property(GLOBAL APPEND PROPERTY Protobuf_EXPORTS SwiftProtobuf)

‎Sources/SwiftProtobufPluginLibrary/CMakeLists.txt

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add_library(SwiftProtobufPluginLibrary
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Array+Extensions.swift
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CodePrinter.swift
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Descriptor+Extensions.swift
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Descriptor.swift
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FieldNumbers.swift
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Google_Protobuf_Compiler_CodeGeneratorResponse+Extensions.swift
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Google_Protobuf_SourceCodeInfo+Extensions.swift
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NamingUtils.swift
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plugin.pb.swift
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ProtoFileToModuleMappings.swift
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ProvidesLocationPath.swift
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ProvidesSourceCodeLocation.swift
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SwiftLanguage.swift
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SwiftProtobufInfo.swift
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SwiftProtobufNamer.swift
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swift_protobuf_module_mappings.pb.swift
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UnicodeScalar+Extensions.swift)
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target_link_libraries(SwiftProtobufPluginLibrary PUBLIC
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SwiftProtobuf)
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install(TARGETS SwiftProtobufPluginLibrary
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ARCHIVE DESTINATION lib/swift$<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:_static>/$<LOWER_CASE:${CMAKE_SYSTEM_NAME}>
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LIBRARY DESTINATION lib/swift$<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:_static>/$<LOWER_CASE:${CMAKE_SYSTEM_NAME}>
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RUNTIME DESTINATION bin)
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get_swift_host_arch(swift_arch)
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install(FILES
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$<TARGET_PROPERTY:SwiftProtobufPluginLibrary,Swift_MODULE_DIRECTORY>/SwiftProtobufPluginLibrary.swiftdoc
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$<TARGET_PROPERTY:SwiftProtobufPluginLibrary,Swift_MODULE_DIRECTORY>/SwiftProtobufPluginLibrary.swiftmodule
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DESTINATION lib/swift$<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:_static>/$<LOWER_CASE:${CMAKE_SYSTEM_NAME}>/${swift_arch})
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set_property(GLOBAL APPEND PROPERTY Protobuf_EXPORTS SwiftProtobufPluginLibrary)

‎Sources/protoc-gen-swift/CMakeLists.txt

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add_executable(protoc-gen-swift
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CommandLine+Extensions.swift
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Descriptor+Extensions.swift
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EnumGenerator.swift
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ExtensionSetGenerator.swift
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FieldGenerator.swift
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FileGenerator.swift
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FileIo.swift
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GenerationError.swift
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GeneratorOptions.swift
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Google_Protobuf_DescriptorProto+Extensions.swift
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Google_Protobuf_FileDescriptorProto+Extensions.swift
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main.swift
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MessageFieldGenerator.swift
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MessageGenerator.swift
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MessageStorageClassGenerator.swift
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OneofGenerator.swift
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StringUtils.swift
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Version.swift)
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target_link_libraries(protoc-gen-swift PRIVATE
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SwiftProtobufPluginLibrary
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SwiftProtobuf)
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install(TARGETS protoc-gen-swift
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DESTINATION bin)
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set_property(GLOBAL APPEND PROPERTY Protobuf_EXPORTS protoc-gen-swift)

‎cmake/modules/SwiftSupport.cmake

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# Returns the current architecture name in a variable
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#
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# Usage:
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# get_swift_host_arch(result_var_name)
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#
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# If the current architecture is supported by Swift, sets ${result_var_name}
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# with the sanitized host architecture name derived from CMAKE_SYSTEM_PROCESSOR.
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function(get_swift_host_arch result_var_name)
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if("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "x86_64")
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set("${result_var_name}" "x86_64" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "aarch64")
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set("${result_var_name}" "aarch64" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "ppc64")
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set("${result_var_name}" "powerpc64" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "ppc64le")
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set("${result_var_name}" "powerpc64le" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "s390x")
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set("${result_var_name}" "s390x" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "armv6l")
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set("${result_var_name}" "armv6" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "armv7l")
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set("${result_var_name}" "armv7" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "armv7-a")
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set("${result_var_name}" "armv7" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "AMD64")
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set("${result_var_name}" "x86_64" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "IA64")
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set("${result_var_name}" "itanium" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "x86")
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set("${result_var_name}" "i686" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "i686")
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set("${result_var_name}" "i686" PARENT_SCOPE)
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else()
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message(FATAL_ERROR "Unrecognized architecture on host system: ${CMAKE_SYSTEM_PROCESSOR}")
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endif()
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endfunction()

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