Merge pull request swiftlang#23001 from compnerd/shims

SwiftShims: update shims copying logic

Author: compnerd

stdlib/public/SwiftShims/CMakeLists.txt

@@ -84,35 +84,7 @@ endif()
 # First extract the "version" used for Clang's resource directory.
 string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
   "${LLVM_PACKAGE_VERSION}")
-
-# Function to find LLVM or Clang headers
-function(find_llvm_clang_headers suffix description out_var)
-  file(TO_CMAKE_PATH "${SWIFT_PATH_TO_CLANG_BUILD}" PATH_TO_CLANG_BUILD)
-
-  set(headers_locations
-      "${LLVM_LIBRARY_DIR}${suffix}"
-      "${PATH_TO_CLANG_BUILD}/${CMAKE_CFG_INTDIR}/lib${suffix}"
-      "${PATH_TO_CLANG_BUILD}/${LLVM_BUILD_TYPE}/lib${suffix}")
-
-  set(headers_location)
-  foreach(loc ${headers_locations})
-    if(EXISTS "${loc}")
-      set(headers_location "${loc}")
-      set(${out_var} "${loc}" PARENT_SCOPE)
-      break()
-    endif()
-  endforeach()
-  if("${headers_location}" STREQUAL "")
-    message(FATAL_ERROR "${description} headers were not found in any of the following locations: ${headers_locations}")
-  endif()
-endfunction()
-
-if(SWIFT_BUILT_STANDALONE)
-  find_llvm_clang_headers("/clang/${CLANG_VERSION}" "Clang"
-    clang_headers_location)
-else() # NOT SWIFT_BUILT_STANDALONE
-  set(clang_headers_location "${LLVM_LIBRARY_DIR}/clang/${CLANG_VERSION}")
-endif()
+set(clang_headers_location "${LLVM_LIBRARY_OUTPUT_INTDIR}/clang/${CLANG_VERSION}")
 
 if("${CMAKE_SYSTEM_NAME}" STREQUAL "Windows")
   set(cmake_symlink_option "copy_directory")
@@ -152,7 +124,7 @@ swift_install_symlink_component(clang-resource-dir-symlink
 # Possibly install Clang headers under Clang's resource directory in case we
 # need to use a different version of the headers than the installed Clang. This
 # should be used in conjunction with clang-resource-dir-symlink.
-file(TO_CMAKE_PATH "${SWIFT_PATH_TO_CLANG_BUILD}"
+file(TO_CMAKE_PATH "${LLVM_LIBRARY_OUTPUT_INTDIR}"
   _SWIFT_SHIMS_PATH_TO_CLANG_BUILD)
 swift_install_in_component(clang-builtin-headers-in-clang-resource-dir
     DIRECTORY "${_SWIFT_SHIMS_PATH_TO_CLANG_BUILD}/lib/clang"