diff --git a/include/wx/chartype.h b/include/wx/chartype.h
index ad8e4bffda..f75fc2805f 100644
--- a/include/wx/chartype.h
+++ b/include/wx/chartype.h
@@ -241,17 +241,28 @@
 /* a helper macro allowing to make another macro Unicode-friendly, see below */
 #define wxAPPLY_T(x) wxT(x)
 
-/* Unicode-friendly __FILE__, __DATE__ and __TIME__ analogs */
+/*
+   Unicode-friendly analogs of the standard __FILE__, DATE and TIME macros.
+
+   These macros exist only for backwards compatibility, there should be no
+   reason to use them in the new code, just use the standard macros instead.
+
+   Also note that we must not use the actual macro names for the two latter
+   ones, as doing this would prevent ccache from caching the results of
+   compiling any file including this header by default, rendering ccache
+   ineffective for wxWidgets programs. Hence the use of "##" below and avoiding
+   naming these macros in this comment.
+ */
 #ifndef __TFILE__
     #define __TFILE__ wxAPPLY_T(__FILE__)
 #endif
 
 #ifndef __TDATE__
-    #define __TDATE__ wxAPPLY_T(__DATE__)
+    #define __TDATE__ wxAPPLY_T(__ ## DATE__)
 #endif
 
 #ifndef __TTIME__
-    #define __TTIME__ wxAPPLY_T(__TIME__)
+    #define __TTIME__ wxAPPLY_T(__ ## TIME__)
 #endif
 
 #endif /* _WX_WXCHARTYPE_H_ */
diff --git a/src/common/utilscmn.cpp b/src/common/utilscmn.cpp
index 5c950471b1..4294dbb115 100644
--- a/src/common/utilscmn.cpp
+++ b/src/common/utilscmn.cpp
@@ -1405,6 +1405,12 @@ wxVersionInfo wxGetLibraryVersionInfo()
 #endif
                wxDEBUG_LEVEL,
 #if !wxUSE_REPRODUCIBLE_BUILD
+               // As explained in the comment near these macros definitions,
+               // ccache has special logic for detecting the use of __DATE__
+               // and __TIME__ macros, which doesn't apply to our own versions
+               // of them, hence this comment is needed just to mention the
+               // standard macro names and to ensure that ccache does _not_
+               // cache the results of compiling this file.
                __TDATE__,
                __TTIME__,
 #endif