build: adjust the build to wire up the library search path

This is needed to support Swift macros on Windows.

Author: compnerd

lldb/cmake/modules/AddLLDB.cmake

@@ -217,17 +217,22 @@ function(add_properties_for_swift_modules target reldir)
       # Workaround for a linker crash related to autolinking: rdar://77839981
       set_property(TARGET ${target} APPEND_STRING PROPERTY
                    LINK_FLAGS " -lobjc ")
+
+    set_property(TARGET ${target} APPEND PROPERTY BUILD_RPATH "${SWIFT_BUILD_RPATH}")
+    set_property(TARGET ${target} APPEND PROPERTY INSTALL_RPATH "${SWIFT_INSTALL_RPATH}")
     elseif (CMAKE_SYSTEM_NAME MATCHES "Linux|Android|OpenBSD|FreeBSD")
       string(REGEX MATCH "^[^-]*" arch ${LLVM_TARGET_TRIPLE})
       target_link_libraries(${target} PRIVATE swiftCore-linux-${arch})
       string(TOLOWER ${CMAKE_SYSTEM_NAME} platform)
       set(SWIFT_BUILD_RPATH "${LLDB_SWIFT_LIBS}/${platform}")
       set(SWIFT_INSTALL_RPATH "$ORIGIN/${reldir}lib/swift/${platform}")
+      set_property(TARGET ${target} APPEND PROPERTY BUILD_RPATH "${SWIFT_BUILD_RPATH}")
+      set_property(TARGET ${target} APPEND PROPERTY INSTALL_RPATH "${SWIFT_INSTALL_RPATH}")
+    elseif(CMAKE_SYSTEM_NAME MATCHES Windows)
+      target_link_directories(${target} PRIVATE
+        ${SWIFT_PATH_TO_SWIFT_SDK}/usr/lib/swift/Windows/x86_64)
     endif()
 
-    set_property(TARGET ${target} APPEND PROPERTY BUILD_RPATH "${SWIFT_BUILD_RPATH}")
-    set_property(TARGET ${target} APPEND PROPERTY INSTALL_RPATH "${SWIFT_INSTALL_RPATH}")
-
     if (SWIFT_SWIFT_PARSER)
       if (CMAKE_SYSTEM_NAME MATCHES "Darwin")
         set_property(TARGET ${target}

llvm/lib/Support/CMakeLists.txt

@@ -79,7 +79,7 @@ endif( MSVC OR MINGW )
 # Delay load shell32.dll if possible to speed up process startup.
 set (delayload_flags)
 if (MSVC)
-  set (delayload_flags delayimp -delayload:shell32.dll -delayload:ole32.dll)
+  set (delayload_flags $<$<NOT:$<LINK_LANGUAGE:Swift>>:delayimp -delayload:shell32.dll -delayload:ole32.dll>)
 endif()
 
 # Link Z3 if the user wants to build it.