Build: Use imported target `LibArchive::LibArchive` instead of variables

Modules/FindLibArchive.cmake

@@ -26,6 +26,9 @@ The module defines the following ``IMPORTED`` targets:
 .. versionadded:: 3.6
   Support for new libarchive 3.2 version string format.
 
+.. versionadded:: 3.17
+  Provides an imported target.
+
 #]=======================================================================]
 
 find_path(LibArchive_INCLUDE_DIR

Source/CMakeLists.txt

@@ -743,7 +743,6 @@ target_include_directories(
     "${CMake_BINARY_DIR}/Source"
     "${CMake_SOURCE_DIR}/Source"
     "${CMake_SOURCE_DIR}/Source/LexerParser"
-    ${CMAKE_TAR_INCLUDES}
     ${CMake_HAIKU_INCLUDE_DIRS}
   )
 target_link_libraries(
@@ -752,8 +751,8 @@ target_link_libraries(
     cmstd
     cmsys
     EXPAT::EXPAT
+    LibArchive::LibArchive
     ZLIB::ZLIB
-    ${CMAKE_TAR_LIBRARIES}
     ${CMAKE_CURL_LIBRARIES}
     ${CMAKE_JSONCPP_LIBRARIES}
     ${CMAKE_LIBUV_LIBRARIES}

Source/Modules/CMakeBuildUtilities.cmake

@@ -259,12 +259,16 @@ if(CMAKE_USE_SYSTEM_LIBARCHIVE)
   if(NOT LibArchive_FOUND)
     message(FATAL_ERROR "CMAKE_USE_SYSTEM_LIBARCHIVE is ON but LibArchive is not found!")
   endif()
-  set(CMAKE_TAR_INCLUDES ${LibArchive_INCLUDE_DIRS})
-  set(CMAKE_TAR_LIBRARIES ${LibArchive_LIBRARIES})
+  # NOTE `FindLibArchive` got imported targets support since 3.17
+  if (NOT TARGET LibArchive::LibArchive)
+    add_library(LibArchive::LibArchive UNKNOWN IMPORTED)
+    set_target_properties(LibArchive::LibArchive PROPERTIES
+      IMPORTED_LOCATION "${LibArchive_LIBRARIES}"
+      INTERFACE_INCLUDE_DIRECTORIES "${LibArchive_INCLUDE_DIRS}")
+  endif ()
 else()
   set(EXPAT_INCLUDE_DIR ${CMAKE_EXPAT_INCLUDES})
   set(EXPAT_LIBRARY ${CMAKE_EXPAT_LIBRARIES})
-  add_compile_definitions(LIBARCHIVE_STATIC)
   set(ENABLE_MBEDTLS OFF)
   set(ENABLE_NETTLE OFF)
   if(DEFINED CMAKE_USE_OPENSSL)
@@ -300,8 +304,9 @@ else()
   set(ENABLE_SAFESEH "" CACHE INTERNAL "libarchive: No /SAFESEH linker flag")
   set(WINDOWS_VERSION "WIN7" CACHE INTERNAL "libarchive: Set Windows version to use (Windows only)")
   add_subdirectory(Utilities/cmlibarchive)
+  add_library(LibArchive::LibArchive ALIAS cmlibarchive)
+  target_compile_definitions(cmlibarchive INTERFACE LIBARCHIVE_STATIC)
   CMAKE_SET_TARGET_FOLDER(cmlibarchive "Utilities/3rdParty")
-  set(CMAKE_TAR_LIBRARIES cmlibarchive ${BZIP2_LIBRARIES})
 endif()
 
 #---------------------------------------------------------------------