Simplify the life of people who want to help evaluating the impact of -dlcode on performance for AMD64 systems.

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@8870 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02

1 files changed, 9 insertions, 0 deletions

diff --git a/driver/optmain.ml b/driver/optmain.ml
index 69a2b5e48..cbb4cfee4 100644
--- a/driver/optmain.ml
+++ b/driver/optmain.ml
@@ -89,6 +89,15 @@ let show_config () =
 ;;
 
 let main () =
+  (* This is a temporary solution to help the community evaluate
+     the impact of -dlcode on performance for AMD64 systems (so that
+     3rd-party libraries can be recompiled with -dlcode without touching
+     their Makefiles).
+  begin
+    try if Sys.getenv "OCAML_DLCODE" <> "" then dlcode := true
+    with Not_found -> ();
+  end;
+
   native_code := true;
   c_compiler := Config.native_c_compiler;
   let ppf = Format.err_formatter in