FIX -nostdlib editor tooling

Author: bobzhang

jscomp/bsb/bsb_merlin_gen.ml

@@ -87,11 +87,20 @@ let output_merlin_namespace buffer ns=
     Buffer.add_string buffer "-open ";
     Buffer.add_string buffer x 
 
+(* Literals.dash_nostdlib::
+   FIX editor tooling, note merlin does not need -nostdlib since we added S and B
+   RLS will add -I for those cmi files,  
+   Some consistency check is needed
+   Unless we tell the editor to peek those cmi for auto-complete and others for building which is too
+   complicated
+*)      
 let bsc_flg_to_merlin_ocamlc_flg bsc_flags  =
-  merlin_flg ^ 
-  String.concat Ext_string.single_space 
-    (List.filter (fun x -> not (Ext_string.starts_with x bs_flg_prefix )) ( 
-     Literals.dash_nostdlib::bsc_flags)) 
+  let flags = (List.filter (fun x -> not (Ext_string.starts_with x bs_flg_prefix )) ( 
+     bsc_flags)) in 
+  if flags <> [] then    
+    merlin_flg ^ 
+    String.concat Ext_string.single_space flags
+  else ""
 
 (* No need for [-warn-error] in merlin  *)     
 let warning_to_merlin_flg (warning: Bsb_warning.t ) : string=