doc: fix doxygen parsing of __attribute__

Ignore __attribute__ because it was wrongly parsed as an identifier.
This configuration is described in
	http://www.stack.nl/~dimitri/doxygen/manual/preprocessing.html

Reported-by: Cyril Cressent <cyril.cressent@intel.com>
Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>

diff --git a/doc/doxy-api.conf b/doc/doxy-api.conf
index 7ea692a..749db78 100644 (file)
--- a/doc/doxy-api.conf
+++ b/doc/doxy-api.conf
@@ -47,9 +47,13 @@ INPUT                   = doc/doxy-api-index.md \
 FILE_PATTERNS           = rte_*.h \
                           cmdline.h
 PREDEFINED              = __DOXYGEN__ \
+                          __attribute__(x)= \
                           RTE_MBUF_SCATTER_GATHER
 
 OPTIMIZE_OUTPUT_FOR_C   = YES
+ENABLE_PREPROCESSING    = YES
+MACRO_EXPANSION         = YES
+EXPAND_ONLY_PREDEF      = YES
 EXTRACT_STATIC          = YES
 HIDE_UNDOC_MEMBERS      = YES
 HIDE_UNDOC_CLASSES      = YES