flambda-backend: Add OCaml 4 feature macros (#1975)

ncik-roberts · web-flow · commit 0e380c9a7b69 · 2023-11-03T12:51:25.000Z
diff --git a/runtime4/caml/version.h.in b/runtime4/caml/version.h.in
@@ -22,3 +22,11 @@
 #undef OCAML_VERSION_EXTRA
 #undef OCAML_VERSION
 #undef OCAML_VERSION_STRING
+
+/* Macros defining differences between Jane Street's version of OCaml and
+   stock OCaml 5, which we will not port over to the OCaml 5 runtime.
+ */
+
+#define JANE_STREET_HAS_OCAML_4_GC
+#define JANE_STREET_HAS_OCAML_4_PRNG
+#define JANE_STREET_HAS_NO_DOMAINS
