doc: speed up dot generation

dot supports generating multiple graphs in one run, that was not always
the case and Doxygen had a default of not using that feature.  Given it
got introduced in dot 1.8.10 and Wikimedia CI server has 2.26.x, I guess
it is safe to enable this.

End result, is less shell out overhead.

Change-Id: Ia07b430bd1af608bbe9c10eecbe2df3e0b9c74fc

diff --git a/maintenance/Doxyfile b/maintenance/Doxyfile
index b8c53e3..ffc8c3b 100644 (file)
--- a/maintenance/Doxyfile
+++ b/maintenance/Doxyfile
@@ -363,7 +363,7 @@ MSCFILE_DIRS           =
 DOT_GRAPH_MAX_NODES    = 50
 MAX_DOT_GRAPH_DEPTH    = 1000
 DOT_TRANSPARENT        = NO
-DOT_MULTI_TARGETS      = NO
+DOT_MULTI_TARGETS      = YES
 GENERATE_LEGEND        = YES
 DOT_CLEANUP            = YES