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Add CMake build of SwiftPM dependencies
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‎CMakeLists.txt

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project(Foundation
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LANGUAGES C Swift)
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option(FOUNDATION_SWIFTPM_DEPS "build Windows SwiftPM dependencies via CMake" NO)
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if(FOUNDATION_SWIFTPM_DEPS)
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include(WindowsSwiftPMDependencies)
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_foundation_setup_windows_swiftpm_dependencies_target()
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return()
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endif()
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if(NOT SWIFT_SYSTEM_NAME)
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if(CMAKE_SYSTEM_NAME STREQUAL Darwin)
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set(SWIFT_SYSTEM_NAME macosx)

‎cmake/modules/WindowsSwiftPMDependencies.cmake

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##===----------------------------------------------------------------------===##
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##
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## This source file is part of the Swift open source project
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##
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## Copyright (c) 2025 Apple Inc. and the Swift project authors
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## Licensed under Apache License v2.0
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##
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## See LICENSE.txt for license information
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## See CONTRIBUTORS.md for the list of Swift project authors
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##
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## SPDX-License-Identifier: Apache-2.0
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##
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##===----------------------------------------------------------------------===##
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# Builds Windows CMake dependencies for a SwiftPM build (zlib, libxml, and curl)
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function(_foundation_setup_windows_swiftpm_dependencies_target)
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message(STATUS "Configuring Windows SwiftPM dependencies target")
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if(NOT CMAKE_HOST_SYSTEM_NAME STREQUAL Windows)
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message(FATAL_ERROR "Windows SwiftPM dependencies is only allowed on Windows hosts. Building on Linux does not require pre-building dependencies via CMake.")
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endif()
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include(ExternalProject)
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set(DEST_DIR "${CMAKE_BINARY_DIR}/windows-deps")
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ExternalProject_Add(zlib
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GIT_REPOSITORY https://github.com/madler/zlib.git
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GIT_TAG v1.3.1
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CMAKE_ARGS
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-DCMAKE_INSTALL_PREFIX=${DEST_DIR}/zlib
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-DBUILD_SHARED_LIBS=NO
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-DCMAKE_POSITION_INDEPENDENT_CODE=YES
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-DCMAKE_BUILD_TYPE=Release
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EXCLUDE_FROM_ALL YES
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)
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ExternalProject_Add(libxml
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GIT_REPOSITORY https://github.com/gnome/libxml2.git
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GIT_TAG v2.11.5
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CMAKE_ARGS
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-DCMAKE_INSTALL_PREFIX=${DEST_DIR}/libxml
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-DBUILD_SHARED_LIBS=NO
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-DLIBXML2_WITH_ICONV=NO
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-DLIBXML2_WITH_ICU=NO
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-DLIBXML2_WITH_LZMA=NO
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-DLIBXML2_WITH_PYTHON=NO
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-DLIBXML2_WITH_TESTS=NO
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-DLIBXML2_WITH_THREADS=YES
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-DLIBXML2_WITH_ZLIB=NO
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-DCMAKE_BUILD_TYPE=Release
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EXCLUDE_FROM_ALL YES
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)
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set(ZLIB_ROOT "${DEST_DIR}/zlib")
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set(ZLIB_LIBRARY_DIR "${ZLIB_ROOT}/lib")
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set(ZLIB_INCLUDE_DIR "${ZLIB_ROOT}/include")
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set(ZLIB_LIBRARY_PATH "${ZLIB_LIBRARY_DIR}/zlibstatic.lib")
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# Add a custom target for zlib's install step that curl can depend on
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ExternalProject_Add_StepTargets(zlib install)
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ExternalProject_Add(curl
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GIT_REPOSITORY https://github.com/curl/curl.git
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GIT_TAG curl-8_9_1
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CMAKE_ARGS
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-DCMAKE_INSTALL_PREFIX=${DEST_DIR}/curl
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-DBUILD_SHARED_LIBS=NO
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-DBUILD_TESTING=NO
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-DBUILD_CURL_EXE=NO
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-DCURL_CA_BUNDLE=none
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-DCURL_CA_FALLBACK=NO
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-DCURL_CA_PATH=none
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-DCURL_BROTLI=NO
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-DCURL_DISABLE_ALTSVC=NO
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-DCURL_DISABLE_AWS=YES
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-DCURL_DISABLE_BASIC_AUTH=NO
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-DCURL_DISABLE_BEARER_AUTH=NO
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-DCURL_DISABLE_COOKIES=NO
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-DCURL_DISABLE_DICT=YES
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-DCURL_DISABLE_DIGEST_AUTH=NO
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-DCURL_DISABLE_DOH=NO
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-DCURL_DISABLE_FILE=YES
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-DCURL_DISABLE_FORM_API=NO
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-DCURL_DISABLE_FTP=YES
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-DCURL_DISABLE_GETOPTIONS=NO
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-DCURL_DISABLE_GOPHER=YES
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-DCURL_DISABLE_HSTS=NO
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-DCURL_DISABLE_HTTP=NO
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-DCURL_DISABLE_HTTP_AUTH=NO
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-DCURL_DISABLE_IMAP=YES
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-DCURL_DISABLE_KERBEROS_AUTH=NO
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-DCURL_DISABLE_LDAP=YES
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-DCURL_DISABLE_LDAPS=YES
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-DCURL_DISABLE_MIME=NO
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-DCURL_DISABLE_MQTT=YES
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-DCURL_DISABLE_NEGOTIATE_AUTH=NO
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-DCURL_DISABLE_NETRC=NO
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-DCURL_DISABLE_NTLM=NO
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-DCURL_DISABLE_PARSEDATE=NO
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-DCURL_DISABLE_POP3=YES
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-DCURL_DISABLE_PROGRESS_METER=YES
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-DCURL_DISABLE_PROXY=NO
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-DCURL_DISABLE_RTSP=YES
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-DCURL_DISABLE_SHUFFLE_DNS=YES
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-DCURL_DISABLE_SMB=YES
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-DCURL_DISABLE_SMTP=YES
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-DCURL_DISABLE_SOCKETPAIR=YES
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-DCURL_DISABLE_SRP=NO
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-DCURL_DISABLE_TELNET=YES
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-DCURL_DISABLE_TFTP=YES
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-DCURL_DISABLE_VERBOSE_STRINGS=NO
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-DCURL_LTO=NO
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-DCURL_USE_BEARSSL=NO
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-DCURL_USE_GNUTLS=NO
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-DCURL_USE_GSSAPI=NO
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-DCURL_USE_LIBPSL=NO
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-DCURL_USE_LIBSSH=NO
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-DCURL_USE_LIBSSH2=NO
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-DCURL_USE_MBEDTLS=NO
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-DCURL_USE_OPENSSL=NO
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-DCURL_USE_SCHANNEL=YES
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-DCURL_USE_WOLFSSL=NO
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-DCURL_WINDOWS_SSPI=YES
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-DCURL_ZLIB=YES
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-DCURL_ZSTD=NO
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-DENABLE_ARES=NO
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-DENABLE_CURLDEBUG=NO
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-DENABLE_DEBUG=NO
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-DENABLE_IPV6=YES
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-DENABLE_MANUAL=NO
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-DENABLE_THREADED_RESOLVER=NO
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-DENABLE_UNICODE=YES
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-DENABLE_UNIX_SOCKETS=NO
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-DENABLE_WEBSOCKETS=YES
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-DHAVE_POLL_FINE=NO
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-DUSE_IDN2=NO
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-DUSE_MSH3=NO
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-DUSE_NGHTTP2=NO
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-DUSE_NGTCP2=NO
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-DUSE_QUICHE=NO
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-DUSE_WIN32_IDN=YES
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-DUSE_WIN32_LARGE_FILES=YES
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-DUSE_WIN32_LDAP=NO
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-DCMAKE_BUILD_TYPE=Release
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-DZLIB_ROOT=${ZLIB_ROOT}
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-DZLIB_LIBRARY=${ZLIB_LIBRARY_PATH}
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-DZLIB_INCLUDE_DIR=${ZLIB_INCLUDE_DIR}
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DEPENDS zlib-install
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EXCLUDE_FROM_ALL YES
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)
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set(LIBXML_LIBRARY_DIR "${DEST_DIR}/libxml/lib")
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set(LIBXML_INCLUDE_DIR "${DEST_DIR}/libxml/include/libxml2")
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ExternalProject_Get_Property(curl INSTALL_DIR)
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set(CURL_LIBRARY_DIR "${DEST_DIR}/curl/lib")
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set(CURL_INCLUDE_DIR "${DEST_DIR}/curl/include")
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message(STATUS "LIBXML_INCLUDE_PATH=${LIBXML_INCLUDE_DIR}")
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message(STATUS "LIBXML_LIBRARY_PATH=${LIBXML_LIBRARY_DIR}")
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message(STATUS "CURL_INCLUDE_PATH=${CURL_INCLUDE_DIR}")
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message(STATUS "CURL_LIBRARY_PATH=${CURL_LIBRARY_DIR}")
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message(STATUS "ZLIB_LIBRARY_PATH=${ZLIB_LIBRARY_DIR}")
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set(COMMENT "Windows dependencies have been built! Please setup your environment variables using the commands below:\n\nset LIBXML_INCLUDE_PATH=${LIBXML_INCLUDE_DIR}")
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ExternalProject_Add_StepTargets(libxml install)
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ExternalProject_Add_StepTargets(curl install)
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add_custom_target(WindowsSwiftPMDependencies
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DEPENDS libxml-install curl-install)
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add_custom_command(TARGET WindowsSwiftPMDependencies POST_BUILD
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COMMAND echo Please run the following commands to set environment variables for the SwiftPM build:)
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add_custom_command(TARGET WindowsSwiftPMDependencies POST_BUILD
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COMMAND echo:)
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add_custom_command(TARGET WindowsSwiftPMDependencies POST_BUILD
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COMMAND echo set LIBXML_INCLUDE_PATH=${LIBXML_INCLUDE_DIR})
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add_custom_command(TARGET WindowsSwiftPMDependencies POST_BUILD
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COMMAND echo set LIBXML_LIBRARY_PATH=${LIBXML_LIBRARY_DIR})
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add_custom_command(TARGET WindowsSwiftPMDependencies POST_BUILD
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COMMAND echo set CURL_INCLUDE_PATH=${CURL_INCLUDE_DIR})
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add_custom_command(TARGET WindowsSwiftPMDependencies POST_BUILD
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COMMAND echo set CURL_LIBRARY_PATH=${CURL_LIBRARY_DIR})
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add_custom_command(TARGET WindowsSwiftPMDependencies POST_BUILD
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COMMAND echo set ZLIB_LIBRARY_PATH=${ZLIB_LIBRARY_DIR})
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endfunction()

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