[cmake] Only set deps for an ExternalProject if the type is executable or library

Summary:
cmake fails with an error when attempting to evaluate $<TARGET_FILE:tgt>
where `tgt` is defined via an `add_custom_target` and thus the `TYPE`
is `UTILITY`. Requesting a TARGET_FILE only works on an `EXECUTABLE`
or one of a few differetnt types of `X_LIBRARY` (e.g. added via
`add_library` or `add_executable`). The logic as implemented in cmake
is below:

  enum TargetType
  {
    EXECUTABLE,
    STATIC_LIBRARY,
    SHARED_LIBRARY,
    MODULE_LIBRARY,
    OBJECT_LIBRARY,
    UTILITY,
    GLOBAL_TARGET,
    INTERFACE_LIBRARY,
    UNKNOWN_LIBRARY
  };

  if (target->GetType() >= cmStateEnums::OBJECT_LIBRARY &&
      target->GetType() != cmStateEnums::UNKNOWN_LIBRARY) {
    ::reportError(context, content->GetOriginalExpression(),
                  "Target \"" + name +
                    "\" is not an executable or library.");
    return nullptr;
  }

This has always been the case back to at least 3.12 (furthest I
checked) but this is causing a new failure in cmake 3.17 while
evaluating ExternalProjectAdd.

Subscribers: mgorny, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77284

Author: lanza

llvm/cmake/modules/LLVMExternalProjectUtils.cmake

@@ -62,7 +62,17 @@ function(llvm_ExternalProject_Add name source_dir)
   foreach(tool ${ARG_TOOLCHAIN_TOOLS})
     if(TARGET ${tool})
       list(APPEND TOOLCHAIN_TOOLS ${tool})
-      list(APPEND TOOLCHAIN_BINS $<TARGET_FILE:${tool}>)
+
+      # $<TARGET_FILE:tgt> only works on add_executable or add_library targets
+      # The below logic mirrors cmake's own implementation
+      get_target_property(target_type "${tool}" TYPE)
+      if(NOT target_type STREQUAL "OBJECT_LIBRARY" AND
+         NOT target_type STREQUAL "UTILITY" AND
+         NOT target_type STREQUAL "GLOBAL_TARGET" AND
+         NOT target_type STREQUAL "INTERFACE_LIBRARY")
+        list(APPEND TOOLCHAIN_BINS $<TARGET_FILE:${tool}>)
+      endif()
+
     endif()
   endforeach()