AddSwift.cmake

include(macCatalystUtils)
include(SwiftList)
include(SwiftWindowsSupport)
include(SwiftAndroidSupport)
include(SwiftCXXUtils)

function(_swift_gyb_target_sources target scope)
 file(GLOB GYB_UNICODE_DATA ${SWIFT_SOURCE_DIR}/utils/UnicodeData/*)
 file(GLOB GYB_STDLIB_SUPPORT ${SWIFT_SOURCE_DIR}/utils/gyb_stdlib_support.py)
 file(GLOB GYB_SOURCEKIT_SUPPORT ${SWIFT_SOURCE_DIR}/utils/gyb_sourcekit_support/*.py)
 set(GYB_SOURCES
${SWIFT_SOURCE_DIR}/utils/gyb
${SWIFT_SOURCE_DIR}/utils/gyb.py
${SWIFT_SOURCE_DIR}/utils/GYBUnicodeDataUtils.py
${SWIFT_SOURCE_DIR}/utils/SwiftIntTypes.py
${GYB_UNICODE_DATA}
${GYB_STDLIB_SUPPORT}
${GYB_SYNTAX_SUPPORT}
${GYB_SOURCEKIT_SUPPORT})

 foreach(source${ARGN})
 get_filename_component(generated${source} NAME_WLE)
 get_filename_component(absolute${source} REALPATH)

 add_custom_command(OUTPUT${CMAKE_CURRENT_BINARY_DIR}/${generated}
COMMAND
${CMAKE_COMMAND} -E env $<TARGET_FILE:Python3::Interpreter> ${SWIFT_SOURCE_DIR}/utils/gyb -D CMAKE_SIZEOF_VOID_P=${CMAKE_SIZEOF_VOID_P}${SWIFT_GYB_FLAGS} -o ${CMAKE_CURRENT_BINARY_DIR}/${generated}.tmp ${absolute}
COMMAND
${CMAKE_COMMAND} -E copy_if_different ${CMAKE_CURRENT_BINARY_DIR}/${generated}.tmp ${CMAKE_CURRENT_BINARY_DIR}/${generated}
COMMAND
${CMAKE_COMMAND} -E remove ${CMAKE_CURRENT_BINARY_DIR}/${generated}.tmp
DEPENDS
${GYB_SOURCES}
${absolute})
 set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/${generated} PROPERTIES
GENERATEDTRUE)
 target_sources(${target}${scope}
${CMAKE_CURRENT_BINARY_DIR}/${generated})
 endforeach()
endfunction()

# SWIFTLIB_DIR is the directory in the build tree where Swift resource files
# should be placed. Note that $CMAKE_CFG_INTDIR expands to "." for
# single-configuration builds.
set(SWIFTLIB_DIR
"${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib/swift")
set(SWIFTSTATICLIB_DIR
"${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib/swift_static")

# SWIFTLIBEXEC_DIR is the directory in the build tree where Swift auxiliary
# executables should be placed.
set(SWIFTLIBEXEC_DIR
"${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/libexec/swift")

function(_compute_lto_flag option out_var)
 string(TOLOWER "${option}" lowercase_option)
 if (lowercase_option STREQUAL"full")
 set(${out_var}"-flto=full" PARENT_SCOPE)
 elseif (lowercase_option STREQUAL"thin")
 set(${out_var}"-flto=thin" PARENT_SCOPE)
 endif()
endfunction()

function(_set_target_prefix_and_suffix target kind sdk)
 precondition(target MESSAGE "target is required")
 precondition(kind MESSAGE "kind is required")
 precondition(sdk MESSAGE "sdk is required")

 if(sdk STREQUAL"ANDROID")
 if(kind STREQUAL"STATIC")
 set_target_properties(${target} PROPERTIES PREFIX"lib"SUFFIX".a")
 elseif(kind STREQUAL"SHARED")
 set_target_properties(${target} PROPERTIES PREFIX"lib"SUFFIX".so")
 endif()
 elseif(sdk STREQUAL"WINDOWS")
 if(kind STREQUAL"STATIC")
 set_target_properties(${target} PROPERTIES PREFIX""SUFFIX".lib")
 elseif(kind STREQUAL"SHARED")
 set_target_properties(${target} PROPERTIES PREFIX""SUFFIX".dll")
 endif()
 endif()
endfunction()

function(swift_get_host_triple out_var)
 if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)
 set(DEPLOYMENT_VERSION "${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_DEPLOYMENT_VERSION}")
 endif()

 if(SWIFT_HOST_VARIANT_SDK STREQUAL"ANDROID")
 set(DEPLOYMENT_VERSION ${SWIFT_ANDROID_API_LEVEL})
 endif()

 get_target_triple(target target_variant "${SWIFT_HOST_VARIANT_SDK}""${SWIFT_HOST_VARIANT_ARCH}"
 MACCATALYST_BUILD_FLAVOR ""
 DEPLOYMENT_VERSION "${DEPLOYMENT_VERSION}")

 set(${out_var}"${target}" PARENT_SCOPE)
endfunction()

# Usage:
# _add_host_variant_c_compile_link_flags(name)
function(_add_host_variant_c_compile_link_flags name)
# MSVC and gcc don't understand -target.
# clang-cl understands --target.
 if(CMAKE_C_COMPILER_ID MATCHES"Clang")
 if("${CMAKE_C_COMPILER_FRONTEND_VARIANT}"STREQUAL"MSVC") # clang-cl options
 target_compile_options(${name}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:--target=${SWIFT_HOST_TRIPLE}>)
 target_link_options(${name}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:--target=${SWIFT_HOST_TRIPLE}>)
 elseif("${SWIFT_HOST_VARIANT_SDK}"STREQUAL"EMSCRIPTEN") # emcc options
# some older emcc don't understand -target=<triple>
# FIXME: remove this when we no longer support Emscripten < 3.1.44
# https://github.com/emscripten-core/emscripten/pull/19840
 target_compile_options(${name}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:--target=${SWIFT_HOST_TRIPLE}>)
 target_link_options(${name}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-target=${SWIFT_HOST_TRIPLE}>)
 else()
 target_compile_options(${name}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-target;${SWIFT_HOST_TRIPLE}>)
 target_link_options(${name}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-target;${SWIFT_HOST_TRIPLE}>)
 endif()
 endif()

 if (CMAKE_Swift_COMPILER)
 target_compile_options(${name}PRIVATE $<$<COMPILE_LANGUAGE:Swift>:-target;${SWIFT_HOST_TRIPLE}>)
 endif()

 set(_sysroot
"${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_ARCH_${SWIFT_HOST_VARIANT_ARCH}_PATH}")
 if(SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_USE_ISYSROOT)
 target_compile_options(${name}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-isysroot;${_sysroot}>)
 elseif(NOT SWIFT_COMPILER_IS_MSVC_LIKE ANDNOT"${_sysroot}"STREQUAL"/")
 target_compile_options(${name}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:--sysroot=${_sysroot}>)
 endif()

 if(SWIFT_HOST_VARIANT_SDK STREQUAL"ANDROID")
# Make sure the Android NDK lld is used.
 swift_android_tools_path(${SWIFT_HOST_VARIANT_ARCH} tools_path)
 target_compile_options(${name}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-B${tools_path}>)
 endif()

 if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)
# We collate -F with the framework path to avoid unwanted deduplication
# of options by target_compile_options -- this way no undesired
# side effects are introduced should a new search path be added.
 target_compile_options(${name}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:
"-F${SWIFT_SDK_${SWIFT_HOST_VARIANT_ARCH}_PATH}/../../../Developer/Library/Frameworks"
 >)
 set_property(TARGET${name} PROPERTY OSX_ARCHITECTURES"${SWIFT_HOST_VARIANT_ARCH}")
 endif()

 _compute_lto_flag("${SWIFT_TOOLS_ENABLE_LTO}" _lto_flag_out)
 if (_lto_flag_out)
 target_compile_options(${name}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:${_lto_flag_out}>)
 target_link_options(${name}PRIVATE${_lto_flag_out})
 endif()

 if(SWIFT_ANALYZE_CODE_COVERAGE)
 set(_cov_flags $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-fprofile-instr-generate -fcoverage-mapping>)
 target_compile_options(${name}PRIVATE${_cov_flags})
 target_link_options(${name}PRIVATE${_cov_flags})
 endif()
endfunction()


function(_add_host_variant_c_compile_flags target)
 _add_host_variant_c_compile_link_flags(${target})

 is_build_type_optimized("${CMAKE_BUILD_TYPE}" optimized)
 if(optimized)
 if("${CMAKE_BUILD_TYPE}"STREQUAL"MinSizeRel")
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-Os>)
 else()
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-O2>)
 endif()

# Omit leaf frame pointers on x86 production builds (optimized, no debug
# info, and no asserts).
 is_build_type_with_debuginfo("${CMAKE_BUILD_TYPE}" debug)
 if(NOT debug ANDNOT LLVM_ENABLE_ASSERTIONS)
 if(SWIFT_HOST_VARIANT_ARCH MATCHES"i?86")
 if(NOT SWIFT_COMPILER_IS_MSVC_LIKE)
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-momit-leaf-frame-pointer>)
 else()
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:/Oy>)
 endif()
 endif()
 endif()
 else()
 if(NOT SWIFT_COMPILER_IS_MSVC_LIKE)
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-O0>)
 else()
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:/Od>)
 endif()
 endif()

# CMake automatically adds the flags for debug info if we use MSVC/clang-cl.
 if(NOT SWIFT_COMPILER_IS_MSVC_LIKE)
 is_build_type_with_debuginfo("${CMAKE_BUILD_TYPE}" debuginfo)
 if(debuginfo)
 _compute_lto_flag("${SWIFT_TOOLS_ENABLE_LTO}" _lto_flag_out)
 if(_lto_flag_out)
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-gline-tables-only>)
 else()
 target_compile_options(${target}PRIVATE${SWIFT_DEBUGINFO_NON_LTO_ARGS})
 endif()
 else()
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-g0>)
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:Swift>:-gnone>)
 endif()
 endif()

 if(SWIFT_HOST_VARIANT_SDK STREQUAL"WINDOWS")
# MSVC/clang-cl don't support -fno-pic or -fms-compatibility-version.
 if(NOT SWIFT_COMPILER_IS_MSVC_LIKE)
 target_compile_options(${target}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-fms-compatibility-version=1900 -fno-pic>)
 endif()

 target_compile_definitions(${target}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:LLVM_ON_WIN32 _CRT_SECURE_NO_WARNINGS _CRT_NONSTDC_NO_WARNINGS>)
 if(NOT"${CMAKE_C_COMPILER_ID}"STREQUAL"MSVC")
 target_compile_definitions(${target}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:_CRT_USE_BUILTIN_OFFSETOF>)
 endif()
# TODO(compnerd) permit building for different families
 target_compile_definitions(${target}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:_CRT_USE_WINAPI_FAMILY_DESKTOP_APP>)
 if(SWIFT_HOST_VARIANT_ARCH MATCHES arm)
 target_compile_definitions(${target}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:_ARM_WINAPI_PARTITION_DESKTOP_SDK_AVAILABLE>)
 endif()
 target_compile_definitions(${target}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:
# TODO(compnerd) handle /MT
 _MD
 _DLL
# NOTE: We assume that we are using VS 2015 U2+
 _ENABLE_ATOMIC_ALIGNMENT_FIX
# NOTE: We use over-aligned values for the RefCount side-table
# (see revision d913eefcc93f8c80d6d1a6de4ea898a2838d8b6f)
# This is required to build with VS2017 15.8+
 _ENABLE_EXTENDED_ALIGNED_STORAGE=1>)
 if(SWIFT_HOST_VARIANT_ARCH MATCHES"ARM64|aarch64")
 target_compile_options(${target}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-D_STD_ATOMIC_USE_ARM64_LDAR_STLR=0>)
 endif()

# msvcprt's std::function requires RTTI, but we do not want RTTI data.
# Emulate /GR-.
# TODO(compnerd) when moving up to VS 2017 15.3 and newer, we can disable
# RTTI again
 if(SWIFT_COMPILER_IS_MSVC_LIKE)
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:/GR->)
 else()
 target_compile_options(${target}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-frtti>
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>"SHELL:-Xclang -fno-rtti-data">)
 endif()

# NOTE: VS 2017 15.3 introduced this to disable the static components of
# RTTI as well. This requires a newer SDK though and we do not have
# guarantees on the SDK version currently.
 target_compile_definitions(${target}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:_HAS_STATIC_RTTI=0>)

# NOTE(compnerd) workaround LLVM invoking `add_definitions(-D_DEBUG)` which
# causes failures for the runtime library when cross-compiling due to
# undefined symbols from the standard library.
 if(NOTCMAKE_BUILD_TYPESTREQUAL"Debug")
 target_compile_options(${target}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-U_DEBUG>)
 endif()
 endif()

 if(SWIFT_HOST_VARIANT_SDK STREQUAL"ANDROID")
 if(SWIFT_HOST_VARIANT_ARCH STREQUAL"x86_64")
# NOTE(compnerd) Android NDK 21 or lower will generate library calls to
# `__sync_val_compare_and_swap_16` rather than lowering to the CPU's
# `cmpxchg16b` instruction as the `cx16` feature is disabled due to a bug
# in Clang. This is being fixed in the current master Clang and will
# hopefully make it into Clang 9.0. In the mean time, workaround this in
# the build.
 if(CMAKE_C_COMPILER_ID MATCHES Clang AND CMAKE_C_COMPILER_VERSION
VERSION_LESS 9.0.0)
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-mcx16>)
 endif()
 endif()
 endif()

 if(LLVM_ENABLE_ASSERTIONS)
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-UNDEBUG>)
 else()
 target_compile_definitions(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:NDEBUG>)
 endif()

 if(SWIFT_ENABLE_RUNTIME_FUNCTION_COUNTERS)
 target_compile_definitions(${target}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:SWIFT_ENABLE_RUNTIME_FUNCTION_COUNTERS>)
 endif()

 string(TOUPPER "${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_THREADING_PACKAGE}" _threading_package)
 target_compile_definitions(${target}PRIVATE
"SWIFT_THREADING_${_threading_package}")

 if((SWIFT_HOST_VARIANT_ARCH STREQUAL"armv7"OR
 SWIFT_HOST_VARIANT_ARCH STREQUAL"aarch64") AND
 (SWIFT_HOST_VARIANT_SDK STREQUAL"LINUX"OR
 SWIFT_HOST_VARIANT_SDK STREQUAL"ANDROID"))
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-funwind-tables>)
 endif()

 if(SWIFT_HOST_VARIANT_SDK STREQUAL"LINUX")
 if(SWIFT_HOST_VARIANT_ARCH STREQUAL"x86_64")
# this is the minimum architecture that supports 16 byte CAS, which is
# necessary to avoid a dependency to libatomic
 target_compile_options(${target}PRIVATE $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:-march=core2>)
 endif()
 endif()

# The LLVM backend is built with these defines on most 32-bit platforms,
# llvm/llvm-project@66395c9, which can cause incompatibilities with the Swift
# frontend if not built the same way.
 if("${SWIFT_HOST_VARIANT_ARCH}"MATCHES"armv6|armv7|i686"AND
NOT (SWIFT_HOST_VARIANT_SDK STREQUAL"ANDROID"AND SWIFT_ANDROID_API_LEVEL LESS 24))
 target_compile_definitions(${target}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:_LARGEFILE_SOURCE _FILE_OFFSET_BITS=64>)
 endif()

 target_compile_definitions(${target}PRIVATE
 $<$<AND:$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>,$<BOOL:${SWIFT_ENABLE_SWIFT_IN_SWIFT}>>:SWIFT_ENABLE_SWIFT_IN_SWIFT>)
endfunction()

function(_add_host_variant_link_flags target)
 _add_host_variant_c_compile_link_flags(${target})

 if(SWIFT_HOST_VARIANT_SDK STREQUAL"LINUX")
 target_link_libraries(${target}PRIVATE
 pthread
 dl)
 if("${SWIFT_HOST_VARIANT_ARCH}"MATCHES"armv5|armv6|armv7|i686")
 target_link_libraries(${target}PRIVATE atomic)
 endif()
 elseif(SWIFT_HOST_VARIANT_SDK STREQUAL"FREEBSD")
 target_link_libraries(${target}PRIVATE
 pthread)
 elseif(SWIFT_HOST_VARIANT_SDK STREQUAL"CYGWIN")
# No extra libraries required.
 elseif(SWIFT_HOST_VARIANT_SDK STREQUAL"WINDOWS")
# We don't need to add -nostdlib using MSVC or clang-cl, as MSVC and
# clang-cl rely on auto-linking entirely.
 if(NOT SWIFT_COMPILER_IS_MSVC_LIKE)
# NOTE: we do not use "/MD" or "/MDd" and select the runtime via linker
# options. This causes conflicts.
 target_link_options(${target}PRIVATE
 -nostdlib)
 endif()
 swift_windows_lib_for_arch(${SWIFT_HOST_VARIANT_ARCH}
${SWIFT_HOST_VARIANT_ARCH}_LIB)
 target_link_directories(${target}PRIVATE
 ${${SWIFT_HOST_VARIANT_ARCH}_LIB})

# NOTE(compnerd) workaround incorrectly extensioned import libraries from
# the Windows SDK on case sensitive file systems.
 target_link_directories(${target}PRIVATE
${CMAKE_BINARY_DIR}/winsdk_lib_${SWIFT_HOST_VARIANT_ARCH}_symlinks)
 elseif(SWIFT_HOST_VARIANT_SDK STREQUAL"HAIKU")
 target_link_libraries(${target}PRIVATE
 bsd)
 target_link_options(${target}PRIVATE
"SHELL:-Xlinker -Bsymbolic")
 elseif(SWIFT_HOST_VARIANT_SDK STREQUAL"ANDROID")
 target_link_libraries(${target}PRIVATE
 dl
log
# We need to add the math library, which is linked implicitly by libc++
 m)

# link against the custom C++ library
 swift_android_cxx_libraries_for_arch(${SWIFT_HOST_VARIANT_ARCH}
 cxx_link_libraries)
 target_link_libraries(${target}PRIVATE
${cxx_link_libraries})
 else()
# If lto is enabled, we need to add the object path flag so that the LTO code
# generator leaves the intermediate object file in a place where it will not
# be touched. The reason why this must be done is that on OS X, debug info is
# left in object files. So if the object file is removed when we go to
# generate a dsym, the debug info is gone.
 if (SWIFT_TOOLS_ENABLE_LTO)
 target_link_options(${target}PRIVATE
"SHELL:-Xlinker -object_path_lto"
"SHELL:-Xlinker ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/${target}-${SWIFT_HOST_VARIANT_SDK}-${SWIFT_HOST_VARIANT_ARCH}-lto${CMAKE_C_OUTPUT_EXTENSION}")
 endif()
 endif()

 if(NOT SWIFT_COMPILER_IS_MSVC_LIKE)
 if(SWIFT_USE_LINKER)
 target_link_options(${target}PRIVATE
 $<$<LINK_LANGUAGE:CXX>:-fuse-ld=${SWIFT_USE_LINKER}$<$<STREQUAL:${CMAKE_HOST_SYSTEM_NAME},Windows>:.exe>>)
 if (CMAKE_Swift_COMPILER)
 target_link_options(${target}PRIVATE
 $<$<LINK_LANGUAGE:Swift>:-use-ld=${SWIFT_USE_LINKER}$<$<STREQUAL:${CMAKE_HOST_SYSTEM_NAME},Windows>:.exe>>)
 endif()
 endif()
 endif()

# Enable dead stripping. Portions of this logic were copied from llvm's
# `add_link_opts` function (which, perhaps, should have been used here in the
# first place, but at this point it's hard to say whether that's feasible).
#
# TODO: Evaluate/enable -f{function,data}-sections --gc-sections for bfd,
# gold, and lld.
 if(NOTCMAKE_BUILD_TYPESTREQUAL"Debug"ANDCMAKE_SYSTEM_NAMEMATCHES Darwin)
 if (NOT SWIFT_DISABLE_DEAD_STRIPPING)
# See rdar://48283130: This gives 6MB+ size reductions for swift and
# SourceKitService, and much larger size reductions for sil-opt etc.
 target_link_options(${target}PRIVATE
"SHELL:-Xlinker -dead_strip")
 endif()
 endif()

 if(SWIFT_LINKER_SUPPORTS_NO_WARN_DUPLICATE_LIBRARIES)
 target_link_options(${target}PRIVATE
"SHELL:-Xlinker -no_warn_duplicate_libraries")
 endif()

# Enable build IDs
 if(SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_USE_BUILD_ID)
 target_link_options(${target}PRIVATE
"SHELL:-Xlinker --build-id=sha1")
 endif()

endfunction()

function(_add_swift_runtime_link_flags target relpath_to_lib_dir bootstrapping)
 if(NOT BOOTSTRAPPING_MODE)
 if (SWIFT_BUILD_SWIFT_SYNTAX)
 set(ASRLF_BOOTSTRAPPING_MODE "HOSTTOOLS")
 else()
 return()
 endif()
 else()
 set(ASRLF_BOOTSTRAPPING_MODE ${BOOTSTRAPPING_MODE})
 endif()

# RPATH where Swift runtime can be found.
 set(swift_runtime_rpath)

 if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)

 set(sdk_dir "${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_ARCH_${SWIFT_HOST_VARIANT_ARCH}_PATH}/usr/lib/swift")

# Note we only check this for bootstrapping, since you ought to
# be able to build using hosttools with the stdlib disabled.
 if(ASRLF_BOOTSTRAPPING_MODE MATCHES"BOOTSTRAPPING.*"AND SWIFT_STDLIB_SUPPORT_BACK_DEPLOYMENT)
# HostCompatibilityLibs is defined as an interface library that
# does not generate any concrete build target
# (https://cmake.org/cmake/help/latest/command/add_library.html#interface-libraries)
# In order to specify a dependency to it using `add_dependencies`
# we need to manually "expand" its underlying targets
 get_property(compatibility_libs
TARGET HostCompatibilityLibs
 PROPERTY INTERFACE_LINK_LIBRARIES)
 set(compatibility_libs_path
"${SWIFTLIB_DIR}/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}/${SWIFT_HOST_VARIANT_ARCH}")
 endif()

# If we found a swift compiler and are going to use swift code in swift
# host side tools but link with clang, add the appropriate -L paths so we
# find all of the necessary swift libraries on Darwin.
 if(ASRLF_BOOTSTRAPPING_MODE STREQUAL"HOSTTOOLS")
# Add in the toolchain directory so we can grab compatibility libraries
 get_filename_component(TOOLCHAIN_BIN_DIR ${SWIFT_EXEC_FOR_SWIFT_MODULES}DIRECTORY)
 get_filename_component(TOOLCHAIN_LIB_DIR "${TOOLCHAIN_BIN_DIR}/../lib/swift/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}"ABSOLUTE)
 target_link_directories(${target}PUBLIC${TOOLCHAIN_LIB_DIR})

# Add the SDK directory for the host platform.
 target_link_directories(${target}PRIVATE"${sdk_dir}")

# Include the abi stable system stdlib in our rpath.
 set(swift_runtime_rpath "/usr/lib/swift")

 elseif(ASRLF_BOOTSTRAPPING_MODE STREQUAL"CROSSCOMPILE-WITH-HOSTLIBS")

# Intentionally don't add the lib dir of the cross-compiled compiler, so that
# the stdlib is not picked up from there, but from the SDK.
# This requires to explicitly add all the needed compatibility libraries. We
# can take them from the current build.
 target_link_libraries(${target}PUBLIC HostCompatibilityLibs)

# Add the SDK directory for the host platform.
 target_link_directories(${target}PRIVATE"${sdk_dir}")

# A backup in case the toolchain doesn't have one of the compatibility libraries.
 target_link_directories(${target}PRIVATE
"${SWIFTLIB_DIR}/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}")

# Include the abi stable system stdlib in our rpath.
 set(swift_runtime_rpath "/usr/lib/swift")

 elseif(ASRLF_BOOTSTRAPPING_MODE STREQUAL"BOOTSTRAPPING-WITH-HOSTLIBS")
# Add the SDK directory for the host platform.
 target_link_directories(${target}PRIVATE"${sdk_dir}")

 if(compatibility_libs_path)
# A backup in case the toolchain doesn't have one of the compatibility libraries.
# We are using on purpose `add_dependencies` instead of `target_link_libraries`,
# since we want to ensure the linker is pulling the matching archives
# only if needed
 target_link_directories(${target}PRIVATE"${compatibility_libs_path}")
 add_dependencies(${target}${compatibility_libs})
 endif()

# Include the abi stable system stdlib in our rpath.
 set(swift_runtime_rpath "/usr/lib/swift")

 elseif(ASRLF_BOOTSTRAPPING_MODE STREQUAL"BOOTSTRAPPING")
# At build time link against the built swift libraries from the
# previous bootstrapping stage.
 get_bootstrapping_swift_lib_dir(bs_lib_dir "${bootstrapping}")
 target_link_directories(${target}PRIVATE${bs_lib_dir})

 if(compatibility_libs_path)
# Required to pick up the built libswiftCompatibility<n>.a libraries
# We are using on purpose `add_dependencies` instead of `target_link_libraries`,
# since we want to ensure the linker is pulling the matching archives
# only if needed
 target_link_directories(${target}PRIVATE"${compatibility_libs_path}")
 add_dependencies(${target}${compatibility_libs})
 endif()

# At runtime link against the built swift libraries from the current
# bootstrapping stage.
 set(swift_runtime_rpath "@loader_path/${relpath_to_lib_dir}/swift/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}")
 else()
 message(FATAL_ERROR "Unknown BOOTSTRAPPING_MODE '${ASRLF_BOOTSTRAPPING_MODE}'")
 endif()

# Workaround for a linker crash related to autolinking: rdar://77839981
 set_property(TARGET${target} APPEND_STRING PROPERTY
LINK_FLAGS" -lobjc ")

 elseif(SWIFT_HOST_VARIANT_SDK MATCHES"LINUX|ANDROID|OPENBSD|FREEBSD|WINDOWS")
 set(swiftrt "swiftImageRegistrationObject${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_OBJECT_FORMAT}-${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}-${SWIFT_HOST_VARIANT_ARCH}")
 if(ASRLF_BOOTSTRAPPING_MODE MATCHES"HOSTTOOLS|CROSSCOMPILE")
 if(ASRLF_BOOTSTRAPPING_MODE STREQUAL"HOSTTOOLS")
# At build time and run time, link against the swift libraries in the
# installed host toolchain.
 if(SWIFT_PATH_TO_SWIFT_SDK)
 set(swift_dir "${SWIFT_PATH_TO_SWIFT_SDK}/usr")
 else()
 get_filename_component(swift_bin_dir ${SWIFT_EXEC_FOR_SWIFT_MODULES}DIRECTORY)
 get_filename_component(swift_dir ${swift_bin_dir}DIRECTORY)
 endif()
 set(host_lib_dir "${swift_dir}/lib/swift/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}")
 else()
 set(host_lib_dir "${SWIFTLIB_DIR}/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}")
 endif()
 set(host_lib_arch_dir "${host_lib_dir}/${SWIFT_HOST_VARIANT_ARCH}")

 set(swiftrt "${host_lib_arch_dir}/swiftrt${CMAKE_C_OUTPUT_EXTENSION}")
 target_link_libraries(${target}PRIVATE${swiftrt})
 target_link_libraries(${target}PRIVATE"swiftCore")

 target_link_directories(${target}PRIVATE${host_lib_dir})
 target_link_directories(${target}PRIVATE${host_lib_arch_dir})

# At runtime, use swiftCore in the current toolchain.
# For building stdlib, LD_LIBRARY_PATH will be set to builder's stdlib
# FIXME: This assumes the ABI hasn't changed since the builder.
 set(swift_runtime_rpath "$ORIGIN/${relpath_to_lib_dir}/swift/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}")

 elseif(ASRLF_BOOTSTRAPPING_MODE STREQUAL"BOOTSTRAPPING")
# At build time link against the built swift libraries from the
# previous bootstrapping stage.
 if (NOT"${bootstrapping}"STREQUAL"0")
 get_bootstrapping_swift_lib_dir(bs_lib_dir "${bootstrapping}")
 target_link_directories(${target}PRIVATE${bs_lib_dir})
 target_link_libraries(${target}PRIVATE${swiftrt})
 target_link_libraries(${target}PRIVATE"swiftCore")
 endif()

# At runtime link against the built swift libraries from the current
# bootstrapping stage.
 set(swift_runtime_rpath "$ORIGIN/${relpath_to_lib_dir}/swift/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}")

 elseif(ASRLF_BOOTSTRAPPING_MODE STREQUAL"BOOTSTRAPPING-WITH-HOSTLIBS")
 message(FATAL_ERROR "BOOTSTRAPPING_MODE 'BOOTSTRAPPING-WITH-HOSTLIBS' not supported on Linux")
 else()
 message(FATAL_ERROR "Unknown BOOTSTRAPPING_MODE '${ASRLF_BOOTSTRAPPING_MODE}'")
 endif()
 else()
 target_link_directories(${target}PRIVATE
${SWIFT_PATH_TO_SWIFT_SDK}/usr/lib/swift/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}/${SWIFT_HOST_VARIANT_ARCH})
 endif()

 if(SWIFT_BUILD_SWIFT_SYNTAX)
# For the "end step" of bootstrapping configurations, we need to be
# able to fall back to the SDK directory for libswiftCore et al.
 if (BOOTSTRAPPING_MODE MATCHES"BOOTSTRAPPING.*")
 if (NOT"${bootstrapping}"STREQUAL"1")
 if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)
 target_link_directories(${target}PRIVATE"${sdk_dir}")

# Include the abi stable system stdlib in our rpath.
 set(swift_runtime_rpath "/usr/lib/swift")

# Add in the toolchain directory so we can grab compatibility libraries
 get_filename_component(TOOLCHAIN_BIN_DIR ${SWIFT_EXEC_FOR_SWIFT_MODULES}DIRECTORY)
 get_filename_component(TOOLCHAIN_LIB_DIR "${TOOLCHAIN_BIN_DIR}/../lib/swift/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}"ABSOLUTE)
 target_link_directories(${target}PUBLIC${TOOLCHAIN_LIB_DIR})
 else()
 get_filename_component(swift_bin_dir ${SWIFT_EXEC_FOR_SWIFT_MODULES}DIRECTORY)
 get_filename_component(swift_dir ${swift_bin_dir}DIRECTORY)
 set(host_lib_dir "${swift_dir}/lib/swift/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}")
 target_link_directories(${target}PRIVATE${host_lib_dir})

 set(swift_runtime_rpath "${host_lib_dir}")
 endif()
 endif()
 endif()
 if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS AND SWIFT_ALLOW_LINKING_SWIFT_CONTENT_IN_DARWIN_TOOLCHAIN)
 get_filename_component(TOOLCHAIN_BIN_DIR ${CMAKE_Swift_COMPILER}DIRECTORY)
 get_filename_component(TOOLCHAIN_LIB_DIR "${TOOLCHAIN_BIN_DIR}/../lib/swift/${SWIFT_SDK_${SWIFT_HOST_VARIANT_SDK}_LIB_SUBDIR}"ABSOLUTE)
 target_link_directories(${target} BEFORE PUBLIC${TOOLCHAIN_LIB_DIR})
 endif()
 if(SWIFT_HOST_VARIANT_SDK MATCHES"LINUX|ANDROID|OPENBSD|FREEBSD"AND SWIFT_USE_LINKER STREQUAL"lld")
 target_link_options(${target}PRIVATE"SHELL:-Xlinker -z -Xlinker nostart-stop-gc")
 endif()
 endif()

 set_property(TARGET${target} PROPERTY BUILD_WITH_INSTALL_RPATHYES)
 set_property(TARGET${target}APPEND PROPERTY INSTALL_RPATH"${swift_runtime_rpath}")
endfunction()

# Add a new Swift host library.
#
# Usage:
# add_swift_host_library(name
# [SHARED]
# [STATIC]
# [OBJECT]
# [LLVM_LINK_COMPONENTS comp1 ...]
# source1 [source2 source3 ...])
#
# name
# Name of the library (e.g., swiftParse).
#
# SHARED
# Build a shared library.
#
# STATIC
# Build a static library.
#
# OBJECT
# Build an object library
#
# LLVM_LINK_COMPONENTS
# LLVM components this library depends on.
#
# source1 ...
# Sources to add into this library.
function(add_swift_host_library name)
 set(options
 SHARED
STATIC
 OBJECT
 HAS_SWIFT_MODULES)
 set(single_parameter_options)
 set(multiple_parameter_options
 LLVM_LINK_COMPONENTS)

 cmake_parse_arguments(ASHL
"${options}"
"${single_parameter_options}"
"${multiple_parameter_options}"
${ARGN})
 set(ASHL_SOURCES ${ASHL_UNPARSED_ARGUMENTS})

 translate_flags(ASHL "${options}")

# Once the new Swift parser is linked, everything has Swift modules.
 if (SWIFT_BUILD_SWIFT_SYNTAX AND ASHL_SHARED)
 set(ASHL_HAS_SWIFT_MODULES ON)
 endif()

 if(NOT ASHL_SHARED ANDNOT ASHL_STATIC ANDNOT ASHL_OBJECT)
 message(FATAL_ERROR "One of SHARED/STATIC/OBJECT must be specified")
 endif()
 if(NOT ASHL_SHARED AND ASHL_HAS_SWIFT_MODULES)
 message(WARNING "Ignoring HAS_SWIFT_MODULES; it's only for SHARED libraries")
 endif()

# Using `support` llvm component ends up adding `-Xlinker /path/to/lib/libLLVMDemangle.a`
# to `LINK_FLAGS` but `libLLVMDemangle.a` is not added as an input to the linking ninja statement.
# As a workaround, include `demangle` component whenever `support` is mentioned.
 if("support"IN_LIST ASHL_LLVM_LINK_COMPONENTS)
 list(APPEND ASHL_LLVM_LINK_COMPONENTS "demangle")
 endif()

 if(ASHL_SHARED)
 set(libkind SHARED)
 elseif(ASHL_STATIC)
 set(libkind STATIC)
 elseif(ASHL_OBJECT)
 set(libkind OBJECT)
 endif()

 add_library(${name}${libkind}${ASHL_SOURCES})

 target_link_directories(${name}PUBLIC"${CMAKE_LIBRARY_OUTPUT_DIRECTORY}")

# Respect LLVM_COMMON_DEPENDS if it is set.
#
# LLVM_COMMON_DEPENDS if a global variable set in ./lib that provides targets
# such as swift-syntax or tblgen that all LLVM/Swift based tools depend on. If
# we don't have it defined, then do not add the dependency since some parts of
# swift host tools do not interact with LLVM/Swift tools and do not define
# LLVM_COMMON_DEPENDS.
 if (LLVM_COMMON_DEPENDS)
 add_dependencies(${name}${LLVM_COMMON_DEPENDS})
 endif()
 llvm_update_compile_flags(${name})
 swift_common_llvm_config(${name}${ASHL_LLVM_LINK_COMPONENTS})
 set_output_directory(${name}
 BINARY_DIR ${SWIFT_RUNTIME_OUTPUT_INTDIR}
 LIBRARY_DIR ${SWIFT_LIBRARY_OUTPUT_INTDIR})

 if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)
 set_target_properties(${name} PROPERTIES
INSTALL_NAME_DIR"@rpath")
 elseif(SWIFT_HOST_VARIANT_SDK STREQUAL"LINUX")
 set_target_properties(${name} PROPERTIES
INSTALL_RPATH"$ORIGIN")
 elseif(SWIFT_HOST_VARIANT_SDK STREQUAL"CYGWIN")
 set_target_properties(${name} PROPERTIES
INSTALL_RPATH"$ORIGIN:/usr/lib/swift/cygwin")
 elseif(SWIFT_HOST_VARIANT_SDK STREQUAL"ANDROID")
 set_target_properties(${name} PROPERTIES
INSTALL_RPATH"$ORIGIN")
 endif()

 set_target_properties(${name} PROPERTIES
BUILD_WITH_INSTALL_RPATHYES
FOLDER"Swift libraries")

 _add_host_variant_c_compile_flags(${name})
 _add_host_variant_link_flags(${name})
 _add_host_variant_c_compile_link_flags(${name})
 _set_target_prefix_and_suffix(${name}"${libkind}""${SWIFT_HOST_VARIANT_SDK}")

 if (ASHL_SHARED AND ASHL_HAS_SWIFT_MODULES)
 _add_swift_runtime_link_flags(${name}".""")
 endif()

# Set compilation and link flags.
 if(SWIFT_HOST_VARIANT_SDK STREQUAL"WINDOWS")
 swift_windows_include_for_arch(${SWIFT_HOST_VARIANT_ARCH}
${SWIFT_HOST_VARIANT_ARCH}_INCLUDE)
 target_include_directories(${name}SYSTEMPRIVATE
 ${${SWIFT_HOST_VARIANT_ARCH}_INCLUDE})

 if(libkind STREQUAL"SHARED")
 target_compile_definitions(${name}PRIVATE
 _WINDLL)
 endif()

 if(NOT CMAKE_C_COMPILER_ID STREQUAL"MSVC")
 swift_windows_get_sdk_vfs_overlay(ASHL_VFS_OVERLAY)
# Both clang and clang-cl on Windows set CMAKE_C_SIMULATE_ID to MSVC.
# We are using CMAKE_C_COMPILER_FRONTEND_VARIANT to detect the correct
# way to pass -Xclang arguments.
 if ("${CMAKE_C_COMPILER_FRONTEND_VARIANT}"STREQUAL"MSVC")
 target_compile_options(${name}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX>:SHELL:/clang:-Xclang /clang:-ivfsoverlay /clang:-Xclang /clang:${ASHL_VFS_OVERLAY}>)
 else()
 target_compile_options(${name}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:"SHELL:-Xclang -ivfsoverlay -Xclang ${ASHL_VFS_OVERLAY}">)

# MSVC doesn't support -Xclang. We don't need to manually specify
# the dependent libraries as `cl`/`clang-cl` does so.
 target_compile_options(${name}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:"SHELL:-Xclang --dependent-lib=oldnames">
# TODO(compnerd) handle /MT, /MTd
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:"SHELL:-Xclang --dependent-lib=msvcrt$<$<CONFIG:Debug>:d>">
 )
 endif()
 endif()

 set_target_properties(${name} PROPERTIES
NO_SONAMEYES)
 endif()

 set_target_properties(${name} PROPERTIES LINKER_LANGUAGE CXX)

 if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)
 target_link_options(${name}PRIVATE
"LINKER:-compatibility_version,1")
 if(SWIFT_COMPILER_VERSION)
 target_link_options(${name}PRIVATE
"LINKER:-current_version,${SWIFT_COMPILER_VERSION}")
 endif()

# For now turn off on Darwin swift targets, debug info if we are compiling a static
# library and set up an rpath so that if someone works around this by using
# shared libraries that in the short term we can find shared libraries.
 if (ASHL_STATIC)
 target_compile_options(${name}PRIVATE $<$<COMPILE_LANGUAGE:Swift>:-gnone>)
 endif()
 endif()

# If we are compiling in release or release with deb info, compile swift code
# with -cross-module-optimization enabled.
 target_compile_options(${name}PRIVATE
 $<$<AND:$<COMPILE_LANGUAGE:Swift>,$<OR:$<CONFIG:Release>,$<CONFIG:RelWithDebInfo>>>:-cross-module-optimization>)

 add_dependencies(dev ${name})
 if(NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
 swift_install_in_component(TARGETS ${name}
 ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}COMPONENT dev
 LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}COMPONENT dev
 RUNTIME DESTINATION bin COMPONENT dev)
 endif()

 swift_is_installing_component(dev is_installing)
 if(NOT is_installing)
 set_property(GLOBALAPPEND PROPERTY SWIFT_BUILDTREE_EXPORTS ${name})
 else()
 set_property(GLOBALAPPEND PROPERTY SWIFT_EXPORTS ${name})
 endif()
endfunction()

macro(add_swift_tool_subdirectory name)
 add_llvm_subdirectory(SWIFT TOOL ${name})
endmacro()

macro(add_swift_lib_subdirectory name)
 add_llvm_subdirectory(SWIFT LIB ${name})
endmacro()

# Add a new Swift host executable.
#
# Usage:
# add_swift_host_tool(name
# [HAS_SWIFT_MODULES | DOES_NOT_USE_SWIFT]
# [THINLTO_LD64_ADD_FLTO_CODEGEN_ONLY]
#
# [BOOTSTRAPPING 0|1]
# [SWIFT_COMPONENT component]
# [LLVM_LINK_COMPONENTS comp1 ...]
# source1 [source2 source3 ...])
#
# name
# Name of the executable (e.g., swift-frontend).
#
# HAS_SWIFT_MODULES
# Whether to link with SwiftCompilerSources library
#
# DOES_NOT_USE_SWIFT
# Do not link with swift runtime
#
# THINLTO_LD64_ADD_FLTO_CODEGEN_ONLY
# Opt-out of LLVM IR optimizations when linking ThinLTO with ld64
#
# BOOTSTRAPPING
# Bootstrapping stage.
#
# SWIFT_COMPONENT
# Installation component where this tool belongs to.
#
# LLVM_LINK_COMPONENTS
# LLVM components this library depends on.
#
# source1 ...
# Sources to add into this executable.
function(add_swift_host_tool executable)
 set(options HAS_SWIFT_MODULES DOES_NOT_USE_SWIFT THINLTO_LD64_ADD_FLTO_CODEGEN_ONLY)
 set(single_parameter_options SWIFT_COMPONENT BOOTSTRAPPING)
 set(multiple_parameter_options LLVM_LINK_COMPONENTS)

 cmake_parse_arguments(ASHT
"${options}"
"${single_parameter_options}"
"${multiple_parameter_options}"
${ARGN})

 precondition(ASHT_SWIFT_COMPONENT
 MESSAGE"Swift Component is required to add a host tool")

# Using `support` llvm component ends up adding `-Xlinker /path/to/lib/libLLVMDemangle.a`
# to `LINK_FLAGS` but `libLLVMDemangle.a` is not added as an input to the linking ninja statement.
# As a workaround, include `demangle` component whenever `support` is mentioned.
 if("support"IN_LIST ASHT_LLVM_LINK_COMPONENTS)
 list(APPEND ASHT_LLVM_LINK_COMPONENTS "demangle")
 endif()

 add_executable(${executable}${ASHT_UNPARSED_ARGUMENTS})
 _add_host_variant_c_compile_flags(${executable})
 _add_host_variant_link_flags(${executable})
 _add_host_variant_c_compile_link_flags(${executable})

# Force executables linker language to be CXX so that we do not link using the
# host toolchain swiftc.
 set_target_properties(${executable} PROPERTIES LINKER_LANGUAGE CXX)

# Respect LLVM_COMMON_DEPENDS if it is set.
#
# LLVM_COMMON_DEPENDS if a global variable set in ./lib that provides targets
# such as swift-syntax or tblgen that all LLVM/Swift based tools depend on. If
# we don't have it defined, then do not add the dependency since some parts of
# swift host tools do not interact with LLVM/Swift tools and do not define
# LLVM_COMMON_DEPENDS.
 if (LLVM_COMMON_DEPENDS)
 add_dependencies(${executable}${LLVM_COMMON_DEPENDS})
 endif()

 if(NOT"${ASHT_BOOTSTRAPPING}"STREQUAL"")
# Strip the "-bootstrapping<n>" suffix from the target name to get the base
# executable name.
 string(REGEX REPLACE "-bootstrapping.*""" executable_filename ${executable})
 set_target_properties(${executable}
 PROPERTIES OUTPUT_NAME${executable_filename})
 endif()

 set_target_properties(${executable} PROPERTIES
FOLDER"Swift executables")
 if(SWIFT_PARALLEL_LINK_JOBS)
 set_target_properties(${executable} PROPERTIES
 JOB_POOL_LINK swift_link_job_pool)
 endif()

# Once the new Swift parser is linked in, every host tool has Swift modules.
 if (SWIFT_BUILD_SWIFT_SYNTAX ANDNOT ASHT_DOES_NOT_USE_SWIFT)
 set(ASHT_HAS_SWIFT_MODULES ON)
 endif()

 if (ASHT_HAS_SWIFT_MODULES)
 _add_swift_runtime_link_flags(${executable}"../lib""${ASHT_BOOTSTRAPPING}")
 endif()

 llvm_update_compile_flags(${executable})
 swift_common_llvm_config(${executable}${ASHT_LLVM_LINK_COMPONENTS})

 get_bootstrapping_path(out_bin_dir
${SWIFT_RUNTIME_OUTPUT_INTDIR}"${ASHT_BOOTSTRAPPING}")
 get_bootstrapping_path(out_lib_dir
${SWIFT_LIBRARY_OUTPUT_INTDIR}"${ASHT_BOOTSTRAPPING}")
 set_output_directory(${executable}
 BINARY_DIR ${out_bin_dir}
 LIBRARY_DIR ${out_lib_dir})

 if(SWIFT_HOST_VARIANT_SDK STREQUAL"WINDOWS")
 swift_windows_include_for_arch(${SWIFT_HOST_VARIANT_ARCH}
${SWIFT_HOST_VARIANT_ARCH}_INCLUDE)
 target_include_directories(${executable}SYSTEMPRIVATE
 ${${SWIFT_HOST_VARIANT_ARCH}_INCLUDE})

# On Windows both clang-cl and clang simulate MSVC.
# We are using CMAKE_C_COMPILER_FRONTEND_VARIANT to distinguish
# clang from clang-cl.
 if(NOT"${CMAKE_C_COMPILER_ID}"STREQUAL"MSVC"ANDNOT"${CMAKE_C_COMPILER_FRONTEND_VARIANT}"STREQUAL"MSVC")
# MSVC doesn't support -Xclang. We don't need to manually specify
# the dependent libraries as `cl`/`clang-cl` does so.
 target_compile_options(${executable}PRIVATE
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:"SHELL:-Xclang --dependent-lib=oldnames">
# TODO(compnerd) handle /MT, /MTd
 $<$<COMPILE_LANGUAGE:C,CXX,OBJC,OBJCXX>:"SHELL:-Xclang --dependent-lib=msvcrt$<$<CONFIG:Debug>:d>">
 )
 endif()
 endif()

# Opt-out of OpenBSD BTCFI if instructed where it is enforced by default.
 if(SWIFT_HOST_VARIANT_SDK STREQUAL"OPENBSD"AND SWIFT_HOST_VARIANT_ARCH STREQUAL"aarch64"ANDNOT SWIFT_OPENBSD_BTCFI)
 target_link_options(${executable}PRIVATE"LINKER:-z,nobtcfi")
 endif()

 if(SWIFT_BUILD_SWIFT_SYNTAX)
 set(extra_relative_rpath "")
 if(NOT"${ASHT_BOOTSTRAPPING}"STREQUAL"")
 if(executable MATCHES"-bootstrapping")
 set(extra_relative_rpath "../")
 endif()
 endif()

 if(SWIFT_HOST_VARIANT_SDK IN_LIST SWIFT_DARWIN_PLATFORMS)
 set_property(
TARGET${executable}
APPEND PROPERTY INSTALL_RPATH
"@executable_path/../${extra_relative_rpath}lib/swift/host/compiler")
 else()
 set_property(
TARGET${executable}
APPEND PROPERTY INSTALL_RPATH
"$ORIGIN/../${extra_relative_rpath}lib/swift/host/compiler")
 endif()
 endif()

 if(ASHT_THINLTO_LD64_ADD_FLTO_CODEGEN_ONLY)
 string(CONCAT lto_codegen_only_link_options
"$<"
"$<AND:"