[doxygen] Added support for doxygen external search.
llvm-svn: 189509
diff --git a/clang/docs/doxygen.cfg.in b/clang/docs/doxygen.cfg.in
index ed9ffcb..497d4bf 100644
--- a/clang/docs/doxygen.cfg.in
+++ b/clang/docs/doxygen.cfg.in
@@ -1227,4 +1227,10 @@
# The SEARCHENGINE tag specifies whether or not a search engine should be
# used. If set to NO the values of all tags below this one will be ignored.
-SEARCHENGINE = NO
+SEARCHENGINE = @enable_server_based_search@
+
+EXTERNAL_SEARCH = @enable_external_search@
+
+EXTERNAL_SEARCH_ID = clang
+
+EXTRA_SEARCH_MAPPINGS = @extra_search_mappings@