diff --git a/docs/Doxyfile b/docs/Doxyfile
index 0ec4551..efa639d 100644
--- a/docs/Doxyfile
+++ b/docs/Doxyfile
@@ -1580,20 +1580,20 @@
 # evaluate all C-preprocessor directives found in the sources and include
 # files.
 
-ENABLE_PREPROCESSING   = NO
+ENABLE_PREPROCESSING   = YES
 
 # If the MACRO_EXPANSION tag is set to YES Doxygen will expand all macro
 # names in the source code. If set to NO (the default) only conditional
 # 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.
@@ -1621,7 +1621,7 @@
 # undefined via #undef or recursively expanded use the := operator
 # instead of the = operator.
 
-PREDEFINED             =
+PREDEFINED             = __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.