[infer][build] detect unused code at compile time

Reviewed By: jvillard

Differential Revision: D5645750

fbshipit-source-id: 6775941

infer/src/jbuild.in

@@ -56,8 +56,8 @@ let sources =
   List.iter one_dir src_dirs ; !files
 
 let common_cflags =
-  let fatal_warnings = "+3+5+6+8+10+11+12+18+19+20+21+23+26+29+27+33+34+35+37+38+39+50+52+57" in
+  let fatal_warnings = "+3+5+6+8+10+11+12+18+19+20+21+23+26+29+27+32+33+34+35+37+38+39+50+52+57" in
-  let warnings = fatal_warnings ^ "-4-9-32-40-41-42-45-48" in
+  let warnings = fatal_warnings ^ "-4-9-40-41-42-45-48" in
   let common_flags =
     [ "-g"
     ; "-short-paths"