flambda-backend: To upstream: use flambda_o3 attribute instead of -O3 in the Makefile for systhreads/

Author: mshinwell

otherlibs/systhreads/Makefile

@@ -38,9 +38,6 @@ CAMLOPT=$(BEST_OCAMLOPT) $(LIBS)
 
 MKLIB=$(CAMLRUN) $(ROOTDIR)/tools/ocamlmklib$(EXE)
 COMPFLAGS=-w +33..39 -warn-error A -g -bin-annot -safe-string
-ifeq "$(FLAMBDA)" "true"
-OPTCOMPFLAGS += -O3
-endif
 
 LIBNAME=threads
 

otherlibs/systhreads/event.ml

@@ -13,6 +13,8 @@
 (*                                                                        *)
 (**************************************************************************)
 
+[@@@ocaml.flambda_o3]
+
 (* Events *)
 type 'a basic_event =
   { poll: unit -> bool;

otherlibs/systhreads/thread.ml

@@ -16,6 +16,8 @@
 
 (* User-level threads *)
 
+[@@@ocaml.flambda_o3]
+
 type t
 
 external thread_initialize : unit -> unit = "caml_thread_initialize"

testsuite/tests/backtrace/callstack.reference

@@ -12,4 +12,4 @@ Raised by primitive operation at Callstack.f0 in file "callstack.ml", line 11, c
 Called from Callstack.f1 in file "callstack.ml", line 12, characters 27-32
 Called from Callstack.f2 in file "callstack.ml", line 13, characters 27-32
 Called from Callstack.f3 in file "callstack.ml", line 14, characters 27-32
-Called from Thread.create.(fun) in file "thread.ml", line 41, characters 8-14
+Called from Thread.create.(fun) in file "thread.ml", line 43, characters 8-14