vtkcompiletools-config: write a depfile for macro detection

CMake/vtkcompiletools-config.cmake.in

@@ -14,11 +14,14 @@ include("${CMAKE_CURRENT_LIST_DIR}/${CMAKE_FIND_PACKAGE_NAME}-targets.cmake")
 include("${CMAKE_CURRENT_LIST_DIR}/${CMAKE_FIND_PACKAGE_NAME}-vtk-module-properties.cmake")
 
 set(_compile_tools_empty_input_file "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/${CMAKE_FIND_PACKAGE_NAME}_empty.h")
+set(_compile_tools_depfile "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/${CMAKE_FIND_PACKAGE_NAME}_macros.d")
 set(_compile_tools_output_file "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/${CMAKE_FIND_PACKAGE_NAME}_macros.h")
 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR
     CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   set(_compile_tools_command
     -dM -E
+    -MD -MF "${_compile_tools_depfile}"
+    -MT "${_compile_tools_output_file}"
     -o "${_compile_tools_output_file}"
     "${_compile_tools_empty_input_file}")
 else ()
@@ -47,6 +50,7 @@ if (_compile_tools_command)
               ${_compile_tools_command}
       DEPENDS "${CMAKE_CXX_COMPILER}"
               "${_compile_tools_empty_input_file}"
+      DEPFILE "${_compile_tools_depfile}"
       WORKING_DIRECTORY
               "${CMAKE_CURRENT_BINARY_DIR}"
       COMMENT "Detecting builtin compiler preprocessor defines for ${CMAKE_FIND_PACKAGE_NAME}")