diff --git a/docs/user/Doxyfile b/docs/user/Doxyfile
index 6720529b6c..2535a7a8aa 100644
--- a/docs/user/Doxyfile
+++ b/docs/user/Doxyfile
@@ -1502,13 +1502,13 @@ ENABLE_PREPROCESSING   = YES
 # compilation will be performed. Macro expansion can be done in a controlled
 # way by setting EXPAND_ONLY_PREDEF to YES.
 
-MACRO_EXPANSION        = NO
+MACRO_EXPANSION        = YES
 
 # If the EXPAND_ONLY_PREDEF and MACRO_EXPANSION tags are both set to YES
 # then the macro expansion is limited to the macros specified with the
 # PREDEFINED and EXPAND_AS_DEFINED tags.
 
-EXPAND_ONLY_PREDEF     = NO
+EXPAND_ONLY_PREDEF     = YES
 
 # If the SEARCH_INCLUDES tag is set to YES (the default) the includes files
 # pointed to by INCLUDE_PATH will be searched when a #include is found.
@@ -1537,7 +1537,8 @@ INCLUDE_FILE_PATTERNS  =
 # instead of the = operator.
 
 PREDEFINED             = __cplusplus \
-                         _SYS_TYPES_H
+                         _SYS_TYPES_H \
+                         __attribute__(x)=
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then
 # this tag can be used to specify a list of macro names that should be expanded.