cpp-id-data.h (UC): Was U, conflicts with U...
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=b6baa67d7947f

Index: libcpp/macro.c
--- libcpp/macro.c.orig
+++ libcpp/macro.c
@@ -154,7 +154,7 @@ _cpp_builtin_macro_text (cpp_reader *pfile, cpp_hashno
 		  {
 		    cpp_errno (pfile, CPP_DL_WARNING,
 			"could not determine file timestamp");
-		    pbuffer->timestamp = U"\"??? ??? ?? ??:??:?? ????\"";
+		    pbuffer->timestamp = UC"\"??? ??? ?? ??:??:?? ????\"";
 		  }
 	      }
 	  }
@@ -252,8 +252,8 @@ _cpp_builtin_macro_text (cpp_reader *pfile, cpp_hashno
 	      cpp_errno (pfile, CPP_DL_WARNING,
 			 "could not determine date and time");
 		
-	      pfile->date = U"\"??? ?? ????\"";
-	      pfile->time = U"\"??:??:??\"";
+	      pfile->date = UC"\"??? ?? ????\"";
+	      pfile->time = UC"\"??:??:??\"";
 	    }
 	}
 
