seppo/chkr/dune

;; https://discuss.ocaml.org/t/dune-how-to-link-statically-on-linux-not-on-others/8537/4?u=mro

(rule
 (with-stdout-to
  flags.sexp
  (run sh %{dep:gen_flags.sh})))

(rule
 (with-stdout-to
  version.ml
  ; (run echo "let dune_project_num = \"%{version:seppo}\"")
  (run sh %{dep:gen_version.sh} "%{version:seppo}" # ${build-number})
  ; https://github.com/ocaml/dune/issues/255#issuecomment-372077123
  ))

; https://stackoverflow.com/a/53325230/349514

(executable
 (name apchk)
 (public_name apchk)
 (package apchk)
 (libraries seppo_lib unix)
 (preprocess
  (pps lwt_ppx))
 ; https://discuss.ocaml.org/t/lwt-ppx-binary-footprint/11818/2
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; Prepare for static linking
 ;
 ; http://rgrinberg.com/posts/static-binaries-tutorial/
 ; https://discuss.ocaml.org/t/statically-link/1464/9
 ; Issue https://discuss.ocaml.org/t/statically-link/1464/13
 ; https://www.systutorials.com/how-to-statically-link-ocaml-programs/
 ;
 ; $ date
 ; Tue Mar 24 11:36:40 CET 2020
 ; $ uname -o -m
 ; x86_64 GNU/Linux
 ; $ cat /etc/issue
 ; Devuan GNU/Linux 1 \n \l
 ;
 ; # on Ubuntu Bionic note
 ; # https://github.com/ocaml/ocaml/issues/9131#issuecomment-599765888
 ; $ sudo add-apt-repository ppa:avsm/musl
 ;
 ; $ sudo apt-get install musl-tools
 ; $ eval (opam env)
 ; $ opam switch create 4.11.2+musl+static+flambda
 ; $ opam switch 4.11.2+musl+static+flambda
 ; $ eval (opam env)
 ; $ cat */deps | xargs opam install --yes
 ; $ make test clean build
 ; $ file _build/default/chkr/*.exe
 ; _build/default/chkr/apchk.exe: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, not stripped
 (flags
  (:include flags.sexp)))

(documentation
 (package apchk))