Add generic documentation

gcc/lang-specs.h

@@ -19,7 +19,9 @@ along with GCC; see the file COPYING3.  If not see
 {".elna",  "@elna", nullptr, 0, 0},
 {"@elna",
     "elna1 %i \
-    %{!Q:-quiet} \
+    %{!Q:-quiet} " DUMPS_OPTIONS("") " %{m*} %{aux-info*} \
+    %{g*} %{O*} %{W*&pedantic*} %{w} %{std*&ansi&trigraphs} \
+    %{pg:-p} %{p} %{f*} %{undef} \
     %{!fsyntax-only:%{S:%W{o*}%{!o*:-o %w%b.s}}} \
     %{fsyntax-only:-o %j} %{-param*} \
     %{!fsyntax-only:%(invoke_as)}",