Index: llvm/cmake/modules/AddLLVM.cmake
===================================================================
--- llvm/cmake/modules/AddLLVM.cmake
+++ llvm/cmake/modules/AddLLVM.cmake
@@ -855,7 +855,17 @@
 
   string(TOUPPER ${name} name_upper)
 
-  option(LLVM_${name_upper}_LINK_INTO_TOOLS "Statically link ${name} into tools (if available)" OFF)
+  if (WIN32)
+    # Dynamically linked pass plugins are not supported on Windows: the plugin
+    # DLL needs to specify for each symbol from the LLVM framework from which
+    # file it is imported, which in case of statically linked executables is
+    # different for each tool (opt, bugpoint, clang, ...).
+    # See llvm/lib/Transforms/Hello for an example that can be
+    # loaded (only) into opt.exe.
+    set(LLVM_${name_upper}_LINK_INTO_TOOLS ON)
+  else ()
+    option(LLVM_${name_upper}_LINK_INTO_TOOLS "Statically link ${name} into tools (if available)" OFF)
+  endif ()
 
   # process_llvm_pass_plugins takes care of the actual linking, just create an
   # object library as of now