On Fri, Oct 21, 2022 at 12:10:43AM +0800, guiHua wrote: Is that LDFLAGS actually valid? You might try putting -pie into CFLAGS, and I don't know if -Wl has any effect at all. I'm not certain why, but I can tell you that caml_local_roots is a symbol in the OCaml runtime: $ cat > hello.ml print_endline "hello, world" $ ocamlopt hello.ml -o hello $ ./hello hello, world $ nm hello | grep caml_local_roots 0000000000000024 a domain_field_caml_local_roots It's actually defined here: https://github.com/ocaml/ocaml/blob/trunk/runtime/caml/memory.h#L238 (The "domain_field_" prefix is something to do with multicore, it used to be a global variable, but now is stored per-thread.) What distro is this? Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW