[cmake,flags] print all configuration flags

Since we do not know wich configuration will be build with
multiconfiguration generators print out all C_FLAGS_XXX and
CXX_FLAGS_XXX variables

cmake/CleaningConfigureFile.cmake

@@ -4,8 +4,44 @@
 # Handy if the generated files might have changed
 #
 
-function(cleaning_configure_file SRC DST)
+include(CFlagsToVar)
+
+function(cleaning_configure_file RSRC RDST)
+  get_filename_component(SRC "${RSRC}" ABSOLUTE BASE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+  get_filename_component(DST "${RDST}" ABSOLUTE BASE_DIR ${CMAKE_CURRENT_BINARY_DIR})
+  get_filename_component(DST_DIR "${DST}" DIRECTORY)
+  if(CMAKE_CONFIGURATION_TYPES)
+    foreach(CFG ${CMAKE_CONFIGURATION_TYPES})
+      set(CURRENT_BUILD_CONFIG ${CFG})
+      cflagstovar(CURRENT_C_FLAGS ${CURRENT_BUILD_CONFIG})
+      configure_file(${SRC} ${DST}_${CFG} ${ARGN})
+      unset(CURRENT_BUILD_CONFIG)
+      unset(CURRENT_C_FLAGS)
+    endforeach()
+  else()
+    # We call this also from CMake scripts without a CMAKE_BUILD_TYPE
+    # Fall back to an explicitly unsupported build type to point out something is wrond
+    # if this variable is used during such a call
+    if(CMAKE_BUILD_TYPE)
+      set(CURRENT_BUILD_CONFIG ${CMAKE_BUILD_TYPE})
+    else()
+      set(CURRENT_BUILD_CONFIG "InvalidBuildType")
+    endif()
+    cflagstovar(CURRENT_C_FLAGS ${CURRENT_BUILD_CONFIG})
+    configure_file(${SRC} ${DST}_${CMAKE_BUILD_TYPE} ${ARGN})
+    unset(CURRENT_BUILD_CONFIG)
+    unset(CURRENT_C_FLAGS)
+  endif()
+
   configure_file(${SRC} ${DST} ${ARGN})
-  set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_CLEAN_FILES ${DST})
-  set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${SRC} ${DST})
+
+  string(SHA256 DST_HASH "${DST}")
+  if(NOT TARGET ct-${DST_HASH})
+    add_custom_target(
+      ct-${DST_HASH} ALL COMMAND ${CMAKE_COMMAND} "-E" "make_directory" "${DST_DIR}"
+      COMMAND ${CMAKE_COMMAND} "-E" "copy" "${DST}_$<CONFIG>" "${DST}" COMMAND ${CMAKE_COMMAND} "-E" "sha256sum"
+                                                                               "${DST}_$<CONFIG>" > ${DST}.hash
+      DEPENDS ${DST} BYPRODUCTS ${DST}.hash
+    )
+  endif()
 endfunction()