[infer] parse the classpath information from the javac command line

Summary: Pass the classpath infromation from the javac command line option file to allow the dection of errors accros Buck targets

Reviewed By: sblackshear

Differential Revision: D5018329

fbshipit-source-id: cf13198

infer/src/base/CommandLineOption.ml

@@ -777,9 +777,6 @@ let args_env_var = "INFER_ARGS"
 
 let extra_env_args = ref []
 
-let extend_env_args args =
-  extra_env_args := List.rev_append args !extra_env_args
-
 let extend_env_args args =
   extra_env_args := List.rev_append args !extra_env_args
 
@@ -792,8 +789,9 @@ let parse_args ~usage ?parse_all action args0 =
     then
       (* for now, we only need to parse -d. we could parse more if we wanted to, but we would risk
          incurring the wrath of ARGUMENT_LIST_TOO_LONG *)
-      let should_parse =
-        String.is_prefix ~prefix:"-" in
+      let should_parse = function
+        | "-d" | "-cp" | "-classpath" -> true
+        | _ -> false in
       let fname = String.slice arg 1 (String.length arg) in
       match In_channel.read_lines fname with
       | lines ->