Merge pull request #61258 from DougGregor/cmake-bootstrap-phase-0

[CMake] Bootstrap stage 0 also needs the host Swift libraries

Author: DougGregor

cmake/modules/AddSwift.cmake

@@ -575,7 +575,7 @@ function(_add_swift_runtime_link_flags target relpath_to_lib_dir bootstrapping)
     # For the "end step" of bootstrapping configurations on Darwin, need to be
     # able to fall back to the SDK directory for libswiftCore et al.
     if (BOOTSTRAPPING_MODE MATCHES "BOOTSTRAPPING.*")
-      if (bootstrapping STREQUAL "")
+      if (NOT "${bootstrapping}" STREQUAL "1")
         if(${SWIFT_HOST_VARIANT_SDK} IN_LIST SWIFT_DARWIN_PLATFORMS)
           target_link_directories(${target} PRIVATE "${sdk_dir}")
         endif()