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Overlay: add C++ interop libraries
This introduces a build of the C++ interop runtime support to the new runtime library build.
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‎Runtimes/Overlay/CMakeLists.txt

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@@ -84,6 +84,7 @@ add_compile_definitions(
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include(ExperimentalFeatures)
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add_subdirectory(clang)
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add_subdirectory(Cxx)
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if(ANDROID)
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add_subdirectory(Android)
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endif()

‎Runtimes/Overlay/Cxx/CMakeLists.txt

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add_subdirectory(cxxshim)
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if(LINUX)
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add_subdirectory(libstdcxx)
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endif()
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add_subdirectory(std)
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add_library(swiftCxx STATIC
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CxxConvertibleToBool.swift
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CxxConvertibleToCollection.swift
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CxxDictionary.swift
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CxxOptional.swift
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CxxPair.swift
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CxxRandomAccessCollection.swift
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CxxSequence.swift
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CxxSet.swift
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CxxSpan.swift
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CxxVector.swift
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UnsafeCxxIterators.swift)
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set_target_properties(swiftCxx PROPERTIES
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Swift_MODULE_NAME Cxx)
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target_compile_options(swiftCxx PRIVATE
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"-strict-memory-safety"
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"-cxx-interoperability-mode=default"
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# This module should not pull in the C++ standard library, so we disable it
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# explicitly. For functionality that depends on the C++ stdlib, use C++
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# stdlib overlay (`swiftstd` module).
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"SHELL:-Xcc -nostdinc++"
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"SHELL:-enable-experimental-feature Span"
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"SHELL:-enable-experimental-feature BuiltinModule"
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"SHELL:-enable-experimental-feature AllowUnsafeAttribute")
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install(TARGETS swiftCxx
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EXPORT SwiftOverlayTargets
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ARCHIVE DESTINATION "${SwiftOverlay_INSTALL_LIBDIR}"
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LIBRARY DESTINATION "${SwiftOverlay_INSTALL_LIBDIR}"
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RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
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emit_swift_interface(swiftCxx)
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install_swift_interface(swiftCxx)
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embed_manifest(swiftCxx)

‎Runtimes/Overlay/Cxx/cxxshim/CMakeLists.txt

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add_library(cxxshim INTERFACE)
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target_include_directories(cxxshim INTERFACE
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$<$<COMPILE_LANGUAGE:Swift>:$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>>)
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install(TARGETS cxxshim
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EXPORT SwiftOverlayTargets
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ARCHIVE DESTINATION "${SwiftOverlay_INSTALL_LIBDIR}"
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LIBRARY DESTINATION "${SwiftOverlay_INSTALL_LIBDIR}"
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RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
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install(FILES
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libcxxshim.h
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libcxxshim.modulemap
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libcxxstdlibshim.h
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DESTINATION "${CMAKE_INSTALL_LIBDIR}/swift/${SwiftOverlay_PLATFORM_SUBDIR}")

‎Runtimes/Overlay/Cxx/libstdcxx/CMakeLists.txt

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add_library(libstdcxx INTERFACE)
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target_include_directories(libstdcxx INTERFACE
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$<$<COMPILE_LANGUAGE:Swift>:$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>>)
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install(TARGETS libstdcxx
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EXPORT SwiftOverlayTargets
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ARCHIVE DESTINATION "${SwiftOverlay_INSTALL_LIBDIR}"
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LIBRARY DESTINATION "${SwiftOverlay_INSTALL_LIBDIR}"
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RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
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install(FILES
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libstdcxx.h
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libstdcxx.modulemap
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DESTINATION "${SwiftOverlay_INSTALL_LIBDIR}")

‎Runtimes/Overlay/Cxx/std/CMakeLists.txt

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add_library(swiftCxxStdlib STATIC
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std.swift
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Chrono.swift
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String.swift)
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set_target_properties(swiftCxxStdlib PROPERTIES
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Swift_MODULE_NAME CxxStdlib)
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target_compile_options(swiftCxxStdlib PRIVATE
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"-strict-memory-safety"
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"-cxx-interoperability-mode=default"
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"SHELL:-enable-experimental-feature AllowUnsafeAttribute"
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# This flag is unnecessary when building with newer compilers that allow using
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# C++ symbols in resilient overlays (see f4204568).
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"SHELL:-enable-experimental-feature AssumeResilientCxxTypes"
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# The varying modularization of the C++ standard library on different
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# platforms makes it difficult to enable MemberImportVisibility for this
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# module
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"SHELL:-disable-upcoming-feature MemberImportVisibility"
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"SHELL:-Xfrontend -module-interface-preserve-types-as-written")
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target_link_libraries(swiftCxxStdlib PRIVATE
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cxxshim
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swift_Builtin_float
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$<$<PLATFORM_ID:Android>:swiftAndroid>)
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target_link_libraries(swiftCxxStdlib PRIVATE
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$<$<PLATFORM_ID:Linux>:libstdcxx)
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install(TARGETS swiftCxxStdlib
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EXPORT SwiftOverlayTargets
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ARCHIVE DESTINATION "${SwiftOverlay_INSTALL_LIBDIR}"
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LIBRARY DESTINATION "${SwiftOverlay_INSTALL_LIBDIR}"
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RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
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emit_swift_interface(swiftCxxStdlib)
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install_swift_interface(swiftCxxStdlib)
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embed_manifest(swiftCxxStdlib)

‎Runtimes/Resync.cmake

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@@ -110,6 +110,8 @@ copy_library_sources("linker-support" "public/ClangOverlays" "Overlay")
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message(STATUS "Clang[${StdlibSources}/public/ClangOverlays] -> ${CMAKE_CURRENT_LIST_DIR}/Overlay/clang")
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copy_files(public/ClangOverlays Overlay/clang FILES float.swift.gyb)
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copy_library_sources("Cxx" "public" "Overlay")
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# Android Overlay
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message(STATUS "Android modulemaps[${StdlibSources}/Platform] -> ${CMAKE_CURRENT_LIST_DIR}/Overlay/Android/clang")
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copy_files(public/Platform Overlay/Android/clang

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