build: cleanup some of the link rules

CMakeLists.txt

@@ -26,15 +26,6 @@ endif()
 
 option(BUILD_SHARED_LIBS "build shared libraries" ON)
 
-find_package(CURL CONFIG)
-if(CURL_FOUND)
-  include(CMakeExpandImportedTargets)
-  cmake_expand_imported_targets(CURL_LIBRARIES LIBRARIES CURL::libcurl)
-else()
-  find_package(CURL REQUIRED)
-endif()
-find_package(ICU COMPONENTS uc i18n REQUIRED)
-find_package(LibXml2 REQUIRED)
 find_package(dispatch CONFIG REQUIRED)
 
 include(SwiftSupport)

CoreFoundation/CMakeLists.txt

@@ -379,8 +379,7 @@ target_compile_definitions(CoreFoundation
                              $<$<COMPILE_LANGUAGE:ASM>:CF_CHARACTERSET_UNICODE_DATA_L="CharacterSets/CFUnicodeData-L.mapping">)
 target_include_directories(CoreFoundation
                            PRIVATE
-                             ${PROJECT_SOURCE_DIR}
-                             ${ICU_INCLUDE_DIR})
+                             ${PROJECT_SOURCE_DIR})
 target_link_libraries(CoreFoundation PRIVATE
   Threads::Threads
   ${CMAKE_DL_LIBS}
@@ -390,6 +389,11 @@ if(CMAKE_SYSTEM_NAME STREQUAL Android)
   target_link_libraries(CoreFoundation PRIVATE
     log)
 endif()
+if(NOT CMAKE_SYSTEM_NAME STREQUAL Darwin)
+  target_link_libraries(CoreFoundation PRIVATE
+    ICU::uc
+    ICU::i18n)
+endif()
 
 add_framework(CFURLSessionInterface
                 ${FRAMEWORK_LIBRARY_TYPE}
@@ -409,10 +413,10 @@ if(CMAKE_SYSTEM_NAME STREQUAL Windows)
                              PRIVATE
                                CURL_STATICLIB)
 endif()
-target_include_directories(CFURLSessionInterface PRIVATE
-  ${CURL_INCLUDE_DIRS})
-target_link_libraries(CFURLSessionInterface PRIVATE
-  ${CURL_LIBRARIES})
+if(NOT CMAKE_SYSTEM_NAME STREQUAL Darwin)
+  target_link_libraries(CFURLSessionInterface PRIVATE
+    CURL::libcurl)
+endif()
 
 add_framework(CFXMLInterface
                 ${FRAMEWORK_LIBRARY_TYPE}
@@ -427,10 +431,10 @@ add_framework(CFXMLInterface
               SOURCES
                 Parsing.subproj/CFXMLInterface.c)
 add_dependencies(CFXMLInterface CoreFoundation)
-target_include_directories(CFXMLInterface PRIVATE
-  ${LIBXML2_INCLUDE_DIR})
-target_link_libraries(CFXMLInterface PRIVATE
-  ${LIBXML2_LIBRARIES})
+if(NOT CMAKE_SYSTEM_NAME STREQUAL Darwin)
+  target_link_libraries(CFXMLInterface PRIVATE
+    LibXml2::LibXml2)
+endif()
 
 if(CMAKE_SYSTEM_NAME STREQUAL Windows)
   add_library(CoreFoundationResources OBJECT

Foundation/CMakeLists.txt

@@ -140,8 +140,6 @@ target_compile_definitions(Foundation PRIVATE
   DEPLOYMENT_RUNTIME_SWIFT)
 target_compile_options(Foundation PUBLIC
   "SHELL:-Xcc -F${CMAKE_BINARY_DIR}")
-target_compile_options(Foundation PRIVATE
-  "SHELL:-Xcc -I${ICU_INCLUDE_DIR}")
 if(CMAKE_SYSTEM_NAME STREQUAL Windows AND CMAKE_VERSION VERSION_LESS 3.16)
   # Work around for CMake 15 which doesn't link in the resource file
   # target properly
@@ -153,8 +151,6 @@ if(ENABLE_TESTING)
     -enable-testing)
 endif()
 target_link_libraries(Foundation PRIVATE
-  ${ICU_UC_LIBRARY}
-  ${ICU_I18N_LIBRARY}
   CoreFoundation
   uuid)
 target_link_libraries(Foundation PUBLIC
@@ -219,8 +215,6 @@ if(ENABLE_TESTING)
     -enable-testing)
 endif()
 target_link_libraries(FoundationNetworking PRIVATE
-  ${CURL_LIBRARIES}
-  ${ZLIB_LIBRARIES}
   Foundation
   CFURLSessionInterface)
 set_target_properties(FoundationNetworking PROPERTIES
@@ -245,7 +239,6 @@ if(ENABLE_TESTING)
     -enable-testing)
 endif()
 target_link_libraries(FoundationXML PRIVATE
-  ${LIBXML2_LIBRARIES}
   Foundation
   CFXMLInterface)
 set_target_properties(FoundationXML PROPERTIES