Configure flag to use the 5.x runtime; make the 5.x runtime build

Author: mshinwell

backend/amd64/emit.mlp

@@ -1761,13 +1761,13 @@ let emit_instr fallthrough i =
       load_label_addr lbl_handler r11;
       I.push r11;
       cfi_adjust_cfa_offset 8;
-      I.push (domain_field Domainstate.Domain_exception_pointer);
+      I.push (domain_field Domainstate.Domain_exn_handler);
       cfi_adjust_cfa_offset 8;
-      I.mov rsp (domain_field Domainstate.Domain_exception_pointer);
+      I.mov rsp (domain_field Domainstate.Domain_exn_handler);
       stack_offset := !stack_offset + 16;
   | Lpoptrap ->
       emit_pop_trap_label ();
-      I.pop (domain_field Domainstate.Domain_exception_pointer);
+      I.pop (domain_field Domainstate.Domain_exn_handler);
       cfi_adjust_cfa_offset (-8);
       I.add (int 8) rsp;
       cfi_adjust_cfa_offset (-8);
@@ -1787,8 +1787,8 @@ let emit_instr fallthrough i =
           (* BACKPORT END *)
           record_frame Reg.Set.empty (Dbg_raise i.dbg)
       | Lambda.Raise_notrace ->
-          I.mov (domain_field Domainstate.Domain_exception_pointer) rsp;
-          I.pop (domain_field Domainstate.Domain_exception_pointer);
+          I.mov (domain_field Domainstate.Domain_exn_handler) rsp;
+          I.pop (domain_field Domainstate.Domain_exn_handler);
           I.pop r11;
           I.jmp r11
       end

configure.ac

@@ -1,6 +1,6 @@
 AC_PREREQ([2.69])
 AC_INIT([The Flambda backend for OCaml],
-        5.1.1+jst-runtime4,
+        5.1.1+jst,
         [[email protected]],
         [flambda_backend],
         [http://github.com/ocaml-flambda/flambda_backend])
@@ -36,6 +36,12 @@ AC_ARG_ENABLE([middle-end],
     [*], [AC_MSG_ERROR([Bad middle end (not closure, flambda or flambda2)])])],
   [AC_MSG_ERROR([--enable-middle-end=closure|flambda|flambda2 must be provided])])
 
+AC_ARG_ENABLE([runtime5],
+  [AS_HELP_STRING([--enable-runtime5],
+    [Use the OCaml 5 runtime])],
+  [runtime5_arg=--enable-runtime5],
+  [runtime5_arg=])
+
 AC_ARG_ENABLE([coverage],
   [AS_HELP_STRING([--enable-coverage],
     [Run compiler tests instrumented to output coverage data using bisect_ppx
@@ -62,7 +68,7 @@ AC_SUBST([legacy_layout])
 AC_DISABLE_OPTION_CHECKING
 
 AX_SUBDIRS_CONFIGURE([ocaml],
-  [$middle_end_arg,-C,--disable-ocamldoc,--disable-stdlib-manpages,--enable-ocamltest],
+  [$middle_end_arg,$runtime5_arg,-C,--disable-ocamldoc,--disable-stdlib-manpages,--enable-ocamltest],
   [],
   [],
   [])

ocaml/.gitignore

@@ -358,3 +358,6 @@ META
 /yacc/.gdb_history
 
 /otherlibs/dynlink/natdynlinkops
+
+dune.runtime_selection
+