lokinet/cmake/StaticBuild.cmake

# cmake bits to do a full static build, downloading and building all dependencies.

# Most of these are CACHE STRINGs so that you can override them using -DWHATEVER during cmake
# invocation to override.

set(LOCAL_MIRROR "" CACHE STRING "local mirror path/URL for lib downloads")

set(OPENSSL_VERSION 1.1.1m CACHE STRING "openssl version")
set(OPENSSL_MIRROR ${LOCAL_MIRROR} https://www.openssl.org/source CACHE STRING "openssl download mirror(s)")
set(OPENSSL_SOURCE openssl-${OPENSSL_VERSION}.tar.gz)
set(OPENSSL_HASH SHA256=f89199be8b23ca45fc7cb9f1d8d3ee67312318286ad030f5316aca6462db6c96
    CACHE STRING "openssl source hash")

set(EXPAT_VERSION 2.4.4 CACHE STRING "expat version")
string(REPLACE "." "_" EXPAT_TAG "R_${EXPAT_VERSION}")
set(EXPAT_MIRROR ${LOCAL_MIRROR} https://github.com/libexpat/libexpat/releases/download/${EXPAT_TAG}
    CACHE STRING "expat download mirror(s)")
set(EXPAT_SOURCE expat-${EXPAT_VERSION}.tar.xz)
set(EXPAT_HASH SHA256=b5d25d6e373351c2ed19b562b4732d01d2589ac8c8e9e7962d8df1207cc311b8
    CACHE STRING "expat source hash")

set(UNBOUND_VERSION 1.14.0 CACHE STRING "unbound version")
set(UNBOUND_MIRROR ${LOCAL_MIRROR} https://nlnetlabs.nl/downloads/unbound CACHE STRING "unbound download mirror(s)")
set(UNBOUND_SOURCE unbound-${UNBOUND_VERSION}.tar.gz)
set(UNBOUND_HASH SHA256=6ef91cbf02d5299eab39328c0857393de7b4885a2fe7233ddfe3c124ff5a89c8
    CACHE STRING "unbound source hash")

set(SQLITE3_VERSION 3370200 CACHE STRING "sqlite3 version")
set(SQLITE3_MIRROR ${LOCAL_MIRROR} https://www.sqlite.org/2022
    CACHE STRING "sqlite3 download mirror(s)")
set(SQLITE3_SOURCE sqlite-autoconf-${SQLITE3_VERSION}.tar.gz)
set(SQLITE3_HASH SHA3_256=3764f471d188ef4e7a70a120f6cb80014dc50bb5fa53406b566508390a32e745
  CACHE STRING "sqlite3 source hash")

set(SODIUM_VERSION 1.0.18 CACHE STRING "libsodium version")
set(SODIUM_MIRROR ${LOCAL_MIRROR}
  https://download.libsodium.org/libsodium/releases
  https://github.com/jedisct1/libsodium/releases/download/${SODIUM_VERSION}-RELEASE
  CACHE STRING "libsodium mirror(s)")
set(SODIUM_SOURCE libsodium-${SODIUM_VERSION}.tar.gz)
set(SODIUM_HASH SHA512=17e8638e46d8f6f7d024fe5559eccf2b8baf23e143fadd472a7d29d228b186d86686a5e6920385fe2020729119a5f12f989c3a782afbd05a8db4819bb18666ef
  CACHE STRING "libsodium source hash")

set(ZMQ_VERSION 4.3.4 CACHE STRING "libzmq version")
set(ZMQ_MIRROR ${LOCAL_MIRROR} https://github.com/zeromq/libzmq/releases/download/v${ZMQ_VERSION}
    CACHE STRING "libzmq mirror(s)")
set(ZMQ_SOURCE zeromq-${ZMQ_VERSION}.tar.gz)
set(ZMQ_HASH SHA512=e198ef9f82d392754caadd547537666d4fba0afd7d027749b3adae450516bcf284d241d4616cad3cb4ad9af8c10373d456de92dc6d115b037941659f141e7c0e
    CACHE STRING "libzmq source hash")

set(LIBUV_VERSION 1.43.0 CACHE STRING "libuv version")
set(LIBUV_MIRROR ${LOCAL_MIRROR} https://dist.libuv.org/dist/v${LIBUV_VERSION}
    CACHE STRING "libuv mirror(s)")
set(LIBUV_SOURCE libuv-v${LIBUV_VERSION}.tar.gz)
set(LIBUV_HASH SHA256=90d72bb7ae18de2519d0cac70eb89c319351146b90cd3f91303a492707e693a4
    CACHE STRING "libuv source hash")

set(ZLIB_VERSION 1.2.11 CACHE STRING "zlib version")
set(ZLIB_MIRROR ${LOCAL_MIRROR} https://zlib.net
    CACHE STRING "zlib mirror(s)")
set(ZLIB_SOURCE zlib-${ZLIB_VERSION}.tar.gz)
set(ZLIB_HASH SHA512=73fd3fff4adeccd4894084c15ddac89890cd10ef105dd5e1835e1e9bbb6a49ff229713bd197d203edfa17c2727700fce65a2a235f07568212d820dca88b528ae
    CACHE STRING "zlib source hash")
  
set(CURL_VERSION 7.81.0 CACHE STRING "curl version")
set(CURL_MIRROR ${LOCAL_MIRROR} https://curl.haxx.se/download https://curl.askapache.com
  CACHE STRING "curl mirror(s)")
set(CURL_SOURCE curl-${CURL_VERSION}.tar.xz)
set(CURL_HASH SHA256=a067b688d1645183febc31309ec1f3cdce9213d02136b6a6de3d50f69c95a7d3
  CACHE STRING "curl source hash")

include(ExternalProject)

set(DEPS_DESTDIR ${CMAKE_BINARY_DIR}/static-deps)
set(DEPS_SOURCEDIR ${CMAKE_BINARY_DIR}/static-deps-sources)

include_directories(BEFORE SYSTEM ${DEPS_DESTDIR}/include)

file(MAKE_DIRECTORY ${DEPS_DESTDIR}/include)

set(deps_cc "${CMAKE_C_COMPILER}")
set(deps_cxx "${CMAKE_CXX_COMPILER}")
if(CMAKE_C_COMPILER_LAUNCHER)
  set(deps_cc "${CMAKE_C_COMPILER_LAUNCHER} ${deps_cc}")
endif()
if(CMAKE_CXX_COMPILER_LAUNCHER)
  set(deps_cxx "${CMAKE_CXX_COMPILER_LAUNCHER} ${deps_cxx}")
endif()


function(expand_urls output source_file)
  set(expanded)
  foreach(mirror ${ARGN})
    list(APPEND expanded "${mirror}/${source_file}")
  endforeach()
  set(${output} "${expanded}" PARENT_SCOPE)
endfunction()

function(add_static_target target ext_target libname)
  add_library(${target} STATIC IMPORTED GLOBAL)
  add_dependencies(${target} ${ext_target})
  set_target_properties(${target} PROPERTIES
    IMPORTED_LOCATION ${DEPS_DESTDIR}/lib/${libname}
  )
endfunction()



set(cross_host "")
set(cross_rc "")
if(CMAKE_CROSSCOMPILING)
  set(cross_host "--host=${ARCH_TRIPLET}")
  if (ARCH_TRIPLET MATCHES mingw AND CMAKE_RC_COMPILER)
    set(cross_rc "WINDRES=${CMAKE_RC_COMPILER}")
  endif()
endif()
if(ANDROID)
  set(android_toolchain_suffix linux-android)
  set(android_compiler_suffix linux-android23)
  if(CMAKE_ANDROID_ARCH_ABI MATCHES x86_64)
    set(android_machine x86_64)
    set(cross_host "--host=x86_64-linux-android")
    set(android_compiler_prefix x86_64)
    set(android_compiler_suffix linux-android23)
    set(android_toolchain_prefix x86_64)
    set(android_toolchain_suffix linux-android)
  elseif(CMAKE_ANDROID_ARCH_ABI MATCHES x86)
    set(android_machine i686)
    set(cross_host "--host=i686-linux-android")
    set(android_compiler_prefix i686)
    set(android_compiler_suffix linux-android23)
    set(android_toolchain_prefix i686)
    set(android_toolchain_suffix linux-android)
  elseif(CMAKE_ANDROID_ARCH_ABI MATCHES armeabi-v7a)
    set(android_machine armv7)
    set(cross_host "--host=armv7a-linux-androideabi")
    set(android_compiler_prefix armv7a)
    set(android_compiler_suffix linux-androideabi23)
    set(android_toolchain_prefix arm)
    set(android_toolchain_suffix linux-androideabi)
  elseif(CMAKE_ANDROID_ARCH_ABI MATCHES arm64-v8a)
    set(android_machine aarch64)
    set(cross_host "--host=aarch64-linux-android")
    set(android_compiler_prefix aarch64)
    set(android_compiler_suffix linux-android23)
    set(android_toolchain_prefix aarch64)
    set(android_toolchain_suffix linux-android)
  else()
    message(FATAL_ERROR "unknown android arch: ${CMAKE_ANDROID_ARCH_ABI}")
  endif()
  set(deps_cc "${CMAKE_ANDROID_NDK}/toolchains/llvm/prebuilt/linux-x86_64/bin/${android_compiler_prefix}-${android_compiler_suffix}-clang")
  set(deps_cxx "${CMAKE_ANDROID_NDK}/toolchains/llvm/prebuilt/linux-x86_64/bin/${android_compiler_prefix}-${android_compiler_suffix}-clang++")
  set(deps_ld "${CMAKE_ANDROID_NDK}/toolchains/llvm/prebuilt/linux-x86_64/bin/${android_compiler_prefix}-${android_toolchain_suffix}-ld")
  set(deps_ranlib "${CMAKE_ANDROID_NDK}/toolchains/llvm/prebuilt/linux-x86_64/bin/${android_toolchain_prefix}-${android_toolchain_suffix}-ranlib")
  set(deps_ar "${CMAKE_ANDROID_NDK}/toolchains/llvm/prebuilt/linux-x86_64/bin/${android_toolchain_prefix}-${android_toolchain_suffix}-ar")
endif()

set(deps_CFLAGS "-O2")
set(deps_CXXFLAGS "-O2")

if(WITH_LTO)
  set(deps_CFLAGS "${deps_CFLAGS} -flto")
endif()

if(APPLE)
  set(deps_CFLAGS "${deps_CFLAGS} -mmacosx-version-min=${CMAKE_OSX_DEPLOYMENT_TARGET}")
  set(deps_CXXFLAGS "${deps_CXXFLAGS} -mmacosx-version-min=${CMAKE_OSX_DEPLOYMENT_TARGET}")
endif()


if("${CMAKE_GENERATOR}" STREQUAL "Unix Makefiles")
  set(_make $(MAKE))
else()
  set(_make make)
endif()


# Builds a target; takes the target name (e.g. "readline") and builds it in an external project with
# target name suffixed with `_external`.  Its upper-case value is used to get the download details
# (from the variables set above).  The following options are supported and passed through to
# ExternalProject_Add if specified.  If omitted, these defaults are used:
set(build_def_DEPENDS "")
set(build_def_PATCH_COMMAND "")
set(build_def_CONFIGURE_COMMAND ./configure ${cross_host} --disable-shared --prefix=${DEPS_DESTDIR} --with-pic
    "CC=${deps_cc}" "CXX=${deps_cxx}" "CFLAGS=${deps_CFLAGS}" "CXXFLAGS=${deps_CXXFLAGS}" ${cross_rc})
set(build_def_BUILD_COMMAND ${_make})
set(build_def_INSTALL_COMMAND ${_make} install)
set(build_def_BUILD_BYPRODUCTS ${DEPS_DESTDIR}/lib/lib___TARGET___.a ${DEPS_DESTDIR}/include/___TARGET___.h)

function(build_external target)
  set(options DEPENDS PATCH_COMMAND CONFIGURE_COMMAND BUILD_COMMAND INSTALL_COMMAND BUILD_BYPRODUCTS)
  cmake_parse_arguments(PARSE_ARGV 1 arg "" "" "${options}")
  foreach(o ${options})
    if(NOT DEFINED arg_${o})
      set(arg_${o} ${build_def_${o}})
    endif()
  endforeach()
  string(REPLACE ___TARGET___ ${target} arg_BUILD_BYPRODUCTS "${arg_BUILD_BYPRODUCTS}")

  string(TOUPPER "${target}" prefix)
  expand_urls(urls ${${prefix}_SOURCE} ${${prefix}_MIRROR})
  ExternalProject_Add("${target}_external"
    DEPENDS ${arg_DEPENDS}
    BUILD_IN_SOURCE ON
    PREFIX ${DEPS_SOURCEDIR}
    URL ${urls}
    URL_HASH ${${prefix}_HASH}
    DOWNLOAD_NO_PROGRESS ON
    PATCH_COMMAND ${arg_PATCH_COMMAND}
    CONFIGURE_COMMAND ${arg_CONFIGURE_COMMAND}
    BUILD_COMMAND ${arg_BUILD_COMMAND}
    INSTALL_COMMAND ${arg_INSTALL_COMMAND}
    BUILD_BYPRODUCTS ${arg_BUILD_BYPRODUCTS}
  )
endfunction()

build_external(libuv
  CONFIGURE_COMMAND ./autogen.sh && ./configure ${cross_host} ${cross_rc} --prefix=${DEPS_DESTDIR} --with-pic --disable-shared --enable-static "CC=${deps_cc}" "CFLAGS=${deps_CFLAGS}"
  BUILD_BYPRODUCTS
    ${DEPS_DESTDIR}/lib/libuv.a
    ${DEPS_DESTDIR}/include/uv.h
  )
add_static_target(libuv libuv_external libuv.a)
target_link_libraries(libuv INTERFACE ${CMAKE_DL_LIBS})

  
build_external(zlib
  CONFIGURE_COMMAND ${CMAKE_COMMAND} -E env "CC=${deps_cc}" "CFLAGS=${deps_CFLAGS} -fPIC" ${cross_extra} ./configure --prefix=${DEPS_DESTDIR} --static
  BUILD_BYPRODUCTS
    ${DEPS_DESTDIR}/lib/libz.a
    ${DEPS_DESTDIR}/include/zlib.h
)
add_static_target(zlib zlib_external libz.a)


set(openssl_system_env "")
set(openssl_configure_command ./config)
if(CMAKE_CROSSCOMPILING)
  if(ARCH_TRIPLET STREQUAL x86_64-w64-mingw32)
    set(openssl_system_env SYSTEM=MINGW64 RC=${CMAKE_RC_COMPILER} AR=${ARCH_TRIPLET}-ar RANLIB=${ARCH_TRIPLET}-ranlib)
  elseif(ARCH_TRIPLET STREQUAL i686-w64-mingw32)
    set(openssl_system_env SYSTEM=MINGW32 RC=${CMAKE_RC_COMPILER} AR=${ARCH_TRIPLET}-ar RANLIB=${ARCH_TRIPLET}-ranlib)
  elseif(ANDROID)
    set(openssl_system_env SYSTEM=Linux MACHINE=${android_machine} LD=${deps_ld} RANLIB=${deps_ranlib} AR=${deps_ar})
    set(openssl_extra_opts no-asm)
  elseif(ARCH_TRIPLET STREQUAL mips64-linux-gnuabi64)
    set(openssl_system_env SYSTEM=Linux MACHINE=mips64)
    set(openssl_configure_command ./Configure linux64-mips64)
  elseif(ARCH_TRIPLET STREQUAL mips-linux-gnu)
    set(openssl_system_env SYSTEM=Linux MACHINE=mips)
  elseif(ARCH_TRIPLET STREQUAL mipsel-linux-gnu)
    set(openssl_system_env SYSTEM=Linux MACHINE=mipsel)
  elseif(ARCH_TRIPLET STREQUAL aarch64-linux-gnu)
    # cross compile arm64
    set(openssl_system_env SYSTEM=Linux MACHINE=aarch64)
  elseif(ARCH_TRIPLET MATCHES arm-linux)
    # cross compile armhf
    set(openssl_system_env SYSTEM=Linux MACHINE=armv4)
  elseif(ARCH_TRIPLET MATCHES powerpc64le)
    # cross compile ppc64le
    set(openssl_system_env SYSTEM=Linux MACHINE=ppc64le)
  endif()
elseif(CMAKE_C_FLAGS MATCHES "-march=armv7")
  # Help openssl figure out that we're building from armv7 even if on armv8 hardware:
  set(openssl_system_env SYSTEM=Linux MACHINE=armv7)
endif()


build_external(openssl
  CONFIGURE_COMMAND ${CMAKE_COMMAND} -E env CC=${deps_cc} ${openssl_system_env} ${openssl_configure_command}
    --prefix=${DEPS_DESTDIR} ${openssl_extra_opts} no-shared no-capieng no-dso no-dtls1 no-ec_nistp_64_gcc_128 no-gost
    no-heartbeats no-md2 no-rc5 no-rdrand no-rfc3779 no-sctp no-ssl-trace no-ssl2 no-ssl3
    no-static-engine no-tests no-weak-ssl-ciphers no-zlib no-zlib-dynamic "CFLAGS=${deps_CFLAGS}"
  INSTALL_COMMAND ${_make} install_sw
  BUILD_BYPRODUCTS
    ${DEPS_DESTDIR}/lib/libssl.a ${DEPS_DESTDIR}/lib/libcrypto.a
    ${DEPS_DESTDIR}/include/openssl/ssl.h ${DEPS_DESTDIR}/include/openssl/crypto.h
)
add_static_target(OpenSSL::SSL openssl_external libssl.a)
add_static_target(OpenSSL::Crypto openssl_external libcrypto.a)
if(WIN32)
  target_link_libraries(OpenSSL::Crypto INTERFACE "ws2_32;crypt32;iphlpapi")
endif()

set(OPENSSL_INCLUDE_DIR ${DEPS_DESTDIR}/include)
set(OPENSSL_CRYPTO_LIBRARY ${DEPS_DESTDIR}/lib/libcrypto.a ${DEPS_DESTDIR}/lib/libssl.a)
set(OPENSSL_VERSION 1.1.1)
set(OPENSSL_ROOT_DIR ${DEPS_DESTDIR})

build_external(expat
  CONFIGURE_COMMAND ./configure ${cross_host} --prefix=${DEPS_DESTDIR} --enable-static
  --disable-shared --with-pic --without-examples --without-tests --without-docbook --without-xmlwf
  "CC=${deps_cc}" "CFLAGS=${deps_CFLAGS}"
)
add_static_target(expat expat_external libexpat.a)


build_external(unbound
  DEPENDS openssl_external expat_external
  CONFIGURE_COMMAND ./configure ${cross_host} ${cross_rc} --prefix=${DEPS_DESTDIR} --disable-shared
  --enable-static --with-libunbound-only --with-pic
  --$<IF:$<BOOL:${WITH_LTO}>,enable,disable>-flto --with-ssl=${DEPS_DESTDIR}
  --with-libexpat=${DEPS_DESTDIR}
  "CC=${deps_cc}" "CFLAGS=${deps_CFLAGS}"
)
add_static_target(libunbound unbound_external libunbound.a)
if(NOT WIN32)
  set_target_properties(libunbound PROPERTIES INTERFACE_LINK_LIBRARIES "OpenSSL::SSL;OpenSSL::Crypto")
else()
  set_target_properties(libunbound PROPERTIES INTERFACE_LINK_LIBRARIES "OpenSSL::SSL;OpenSSL::Crypto;ws2_32;crypt32;iphlpapi")
endif()



build_external(sodium CONFIGURE_COMMAND ./configure ${cross_host} ${cross_rc} --prefix=${DEPS_DESTDIR} --disable-shared
          --enable-static --with-pic "CC=${deps_cc}" "CFLAGS=${deps_CFLAGS}")
add_static_target(sodium sodium_external libsodium.a)

build_external(sqlite3)
add_static_target(sqlite3 sqlite3_external libsqlite3.a)


if(ARCH_TRIPLET MATCHES mingw)
  option(WITH_WEPOLL "use wepoll zmq poller (crashy)" OFF)
  if(WITH_WEPOLL)
    set(zmq_extra --with-poller=wepoll)
  endif()
endif()

if(CMAKE_CROSSCOMPILING AND ARCH_TRIPLET MATCHES mingw)
  set(zmq_patch
    PATCH_COMMAND ${PROJECT_SOURCE_DIR}/contrib/apply-patches.sh ${PROJECT_SOURCE_DIR}/contrib/patches/libzmq-mingw-wepoll.patch ${PROJECT_SOURCE_DIR}/contrib/patches/libzmq-mingw-closesocket.patch)
endif()

build_external(zmq
  DEPENDS sodium_external
  ${zmq_patch}
  CONFIGURE_COMMAND ./configure ${cross_host} --prefix=${DEPS_DESTDIR} --enable-static --disable-shared
    --disable-curve-keygen --enable-curve --disable-drafts --disable-libunwind --with-libsodium
    --without-pgm --without-norm --without-vmci --without-docs --with-pic --disable-Werror --disable-libbsd ${zmq_extra}
    "CC=${deps_cc}" "CXX=${deps_cxx}" "CFLAGS=${deps_CFLAGS} -fstack-protector" "CXXFLAGS=${deps_CXXFLAGS} -fstack-protector"
    "sodium_CFLAGS=-I${DEPS_DESTDIR}/include" "sodium_LIBS=-L${DEPS_DESTDIR}/lib -lsodium"
)
add_static_target(libzmq zmq_external libzmq.a)

set(libzmq_link_libs "sodium")
if(CMAKE_CROSSCOMPILING AND ARCH_TRIPLET MATCHES mingw)
  list(APPEND libzmq_link_libs iphlpapi)
endif()

set_target_properties(libzmq PROPERTIES
  INTERFACE_LINK_LIBRARIES "${libzmq_link_libs}"
  INTERFACE_COMPILE_DEFINITIONS "ZMQ_STATIC")

set(curl_extra)
if(WIN32)
  set(curl_ssl_opts --without-ssl --with-schannel)
elseif(APPLE)
  set(curl_ssl_opts --without-ssl --with-secure-transport)
  if(IOS)
    # This CPP crap shouldn't be necessary but is because Apple's toolchain is trash
    set(curl_extra "LDFLAGS=-L${DEPS_DESTDIR}/lib -isysroot ${CMAKE_OSX_SYSROOT}" CPP=cpp)
  endif()
else()
  set(curl_ssl_opts --with-ssl=${DEPS_DESTDIR})
  set(curl_extra "LIBS=-pthread")
endif()

set(curl_arches default)
set(curl_lib_outputs)
if(IOS)
  # On iOS things get a little messy: curl won't build a multi-arch library (with `clang -arch arch1
  # -arch arch2`) so we have to build them separately then glue them together if we're building
  # multiple.
  set(curl_arches ${CMAKE_OSX_ARCHITECTURES})
  list(GET curl_arches 0 curl_arch0)
  list(LENGTH CMAKE_OSX_ARCHITECTURES num_arches)
endif()

foreach(curl_arch ${curl_arches})
  set(curl_target_suffix "")
  set(curl_prefix "${DEPS_DESTDIR}")
  if(curl_arch STREQUAL "default")
    set(curl_cflags_extra "")
  elseif(IOS)
    set(cflags_extra " -arch ${curl_arch}")
    if(num_arches GREATER 1)
      set(curl_target_suffix "-${curl_arch}")
      set(curl_prefix "${DEPS_DESTDIR}/tmp/${curl_arch}")
    endif()
  else()
    message(FATAL_ERROR "unexpected curl_arch=${curl_arch}")
  endif()

  build_external(curl
    TARGET_SUFFIX ${curl_target_suffix}
    DEPENDS openssl_external zlib_external
    CONFIGURE_COMMAND ./configure ${cross_host} ${cross_extra} --prefix=${curl_prefix} --disable-shared
    --enable-static --disable-ares --disable-ftp --disable-ldap --disable-laps --disable-rtsp
    --disable-dict --disable-telnet --disable-tftp --disable-pop3 --disable-imap --disable-smb
    --disable-smtp --disable-gopher --disable-manual --disable-libcurl-option --enable-http
    --enable-ipv6 --disable-threaded-resolver --disable-pthreads --disable-verbose --disable-sspi
    --enable-crypto-auth --disable-ntlm-wb --disable-tls-srp --disable-unix-sockets --disable-cookies
    --enable-http-auth --enable-doh --disable-mime --enable-dateparse --disable-netrc --without-libidn2
    --disable-progress-meter --without-brotli --with-zlib=${DEPS_DESTDIR} ${curl_ssl_opts}
    --without-librtmp --disable-versioned-symbols --enable-hidden-symbols
    --without-zsh-functions-dir --without-fish-functions-dir
    --without-nghttp3 --without-zstd
    "CC=${deps_cc}" "CFLAGS=${deps_noarch_CFLAGS}${cflags_extra}" ${curl_extra}
    BUILD_COMMAND true
    INSTALL_COMMAND ${_make} -C lib install && ${_make} -C include install
    BUILD_BYPRODUCTS
      ${curl_prefix}/lib/libcurl.a
      ${curl_prefix}/include/curl/curl.h
  )
  list(APPEND curl_lib_targets curl${curl_target_suffix}_external)
  list(APPEND curl_lib_outputs ${curl_prefix}/lib/libcurl.a)
endforeach()

message(STATUS "TARGETS: ${curl_lib_targets}")

if(IOS AND num_arches GREATER 1)
  # We are building multiple architectures for different iOS devices, so we need to glue the
  # separate libraries into one. (Normally multiple -arch values passed to clang does this for us,
  # but curl refuses to build that way).
  add_custom_target(curl_external
    COMMAND lipo ${curl_lib_outputs} -create -output ${DEPS_DESTDIR}/libcurl.a
    COMMAND ${CMAKE_COMMAND} -E copy_directory ${DEPS_DESTDIR}/tmp/${curl_arch0}/include/curl ${DEPS_DESTDIR}/include/curl
    BYPRODUCTS ${DEPS_DESTDIR}/lib/libcurl.a ${DEPS_DESTDIR}/include/curl/curl.h
    DEPENDS ${curl_lib_targets})
endif()

add_static_target(CURL::libcurl curl_external libcurl.a)
set(libcurl_link_libs zlib)
if(CMAKE_CROSSCOMPILING AND ARCH_TRIPLET MATCHES mingw)
  list(APPEND libcurl_link_libs crypt32)
elseif(APPLE)
  list(APPEND libcurl_link_libs "-framework Security -framework CoreFoundation")
endif()
set_target_properties(CURL::libcurl PROPERTIES
  INTERFACE_LINK_LIBRARIES "${libcurl_link_libs}"
  INTERFACE_COMPILE_DEFINITIONS "CURL_STATICLIB")