[vcpkg baseline][vcpkg toolchain] Fix toolchain usage with CMake <= 3…

….19 (#23410)

* Fix toolchain usage with CMake <= 3.19

* Add quotes

* Merge Neumann-A:fix_tools_selection into dg0yt:cmake-3.19-quirk

Co-authored-by: JackBoosY <yuzaiyang@beyondsoft.com>

scripts/buildsystems/vcpkg.cmake

@@ -518,17 +518,22 @@ if(VCPKG_MANIFEST_MODE AND VCPKG_MANIFEST_INSTALL AND NOT Z_VCPKG_CMAKE_IN_TRY_C
 endif()
 
 option(VCPKG_SETUP_CMAKE_PROGRAM_PATH "Enable the setup of CMAKE_PROGRAM_PATH to vcpkg paths" ON)
-cmake_dependent_option(VCPKG_USE_HOST_TOOLS "Setup CMAKE_PROGRAM_PATH to use host tools" ON "NOT VCPKG_HOST_TRIPLET STREQUAL \"\"" OFF)
+set(VCPKG_CAN_USE_HOST_TOOLS OFF)
+if(DEFINED VCPKG_HOST_TRIPLET AND NOT VCPKG_HOST_TRIPLET STREQUAL "")
+ set(VCPKG_CAN_USE_HOST_TOOLS ON)
+endif()
+cmake_dependent_option(VCPKG_USE_HOST_TOOLS "Setup CMAKE_PROGRAM_PATH to use host tools" ON "VCPKG_CAN_USE_HOST_TOOLS" OFF)
+unset(VCPKG_CAN_USE_HOST_TOOLS)
 
 if(VCPKG_SETUP_CMAKE_PROGRAM_PATH)
  set(tools_base_path "${VCPKG_INSTALLED_DIR}/${VCPKG_TARGET_TRIPLET}/tools")
  if(VCPKG_USE_HOST_TOOLS)
  set(tools_base_path "${VCPKG_INSTALLED_DIR}/${VCPKG_HOST_TRIPLET}/tools")
  endif()
  list(APPEND CMAKE_PROGRAM_PATH "${tools_base_path}")
- file(GLOB_RECURSE Z_VCPKG_TOOLS_DIRS "${tools_base_path}/*")
+ file(GLOB_RECURSE Z_VCPKG_TOOLS_DIRS LIST_DIRECTORIES true "${tools_base_path}/*")
  file(GLOB_RECURSE Z_VCPKG_TOOLS_FILES LIST_DIRECTORIES false "${tools_base_path}/*")
- list(REMOVE_ITEM Z_VCPKG_TOOLS_DIRS ${Z_VCPKG_TOOLS_FILES})
+ list(REMOVE_ITEM Z_VCPKG_TOOLS_DIRS ${Z_VCPKG_TOOLS_FILES} "") # need at least one item for REMOVE_ITEM if CMake <= 3.19
  list(FILTER Z_VCPKG_TOOLS_DIRS EXCLUDE REGEX "/debug/")
  foreach(Z_VCPKG_TOOLS_DIR IN LISTS Z_VCPKG_TOOLS_DIRS)
  list(APPEND CMAKE_PROGRAM_PATH "${Z_VCPKG_TOOLS_DIR}")