File otp_src_20.0-rc1-lib-compile-abstract-compress.patch of Package erlang
diff -Ndurp otp_src_20.0-rc1/lib/compiler/src/compile.erl otp_src_20.0-rc1-lib-compile-abstract-compress/lib/compiler/src/compile.erl
--- otp_src_20.0-rc1/lib/compiler/src/compile.erl	2017-05-04 18:05:27.000000000 +0300
+++ otp_src_20.0-rc1-lib-compile-abstract-compress/lib/compiler/src/compile.erl	2017-05-06 23:34:30.389510749 +0300
@@ -1327,7 +1327,7 @@ debug_info(#compile{module=Module,mod_op
 	    false -> {erl_abstract_code,{none,AbstOpts},Opts1};
 	    true -> {erl_abstract_code,{Abst,AbstOpts},[debug_info | Opts1]}
 	end,
-    DebugInfo = erlang:term_to_binary({debug_info_v1,Backend,Metadata}, [compressed]),
+    DebugInfo = erlang:term_to_binary({debug_info_v1,Backend,Metadata}, [{compressed, 9}]),
 
     case member(encrypt_debug_info, Opts2) of
 	true ->