ocaml - 使兼容的 ocaml、camlp4、ppx、node、js_of_ocaml、ocamlbuild

Question

安装后npm和 node , 用 js_of_ocaml 编译 OCaml 文件给出了错误，因此我做了 opam switch reinstall system :

:testweb $ opam switch reinstall system
Your system compiler has been changed. Do you want to upgrade your OPAM installation ? [Y/n] y

=-=- Upgrading system -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  🐫 
[WARNING] base-ocamlbuild.base is not available because it requires OCaml >= 3.10 & < 4.03. Skipping.
[WARNING] camlp4.4.02+system is not available because your system doesn't comply with preinstalled &
      ocaml-version >= "4.02" & ocaml-version < "4.03". Skipping.
[WARNING] ppx_tools.4.02.3 is not available because your system doesn't comply with ocaml-version >=
      "4.02.0" & ocaml-version < "4.03.0". Skipping.
The following dependencies couldn't be met:
  - deriving -> camlp4
Your request can't be satisfied:
  - camlp4 is not available because your system doesn't comply with ocaml-version >= "4.04".

No solution found, exiting
The former package state can be restored with opam switch import "/Users/softtimur/.opam/backup/state-20160418124642.export" --switch system

然后，我意识到ocamlfind不再工作了:

:testweb $ ocamlfind ocamlc -package js_of_ocaml.ppx -linkpkg cubes.ml -o T
-bash: /Users/softtimur/.opam/system/bin/ocamlfind: No such file or directory

PS:node --version给 v6.1.0 ; npm --version给 3.8.6 ; ocaml -version给 The OCaml toplevel, version 4.03.0 .js_of_ocaml --version是 2.7 ，但在 opam swtich reinstall system 之后，它给出 -bash: /Users/softtimur/.opam/system/bin/js_of_ocaml: No such file or directory .

有谁知道如何使所有这些软件包兼容？

之前:这是安装后的编译错误npm和 node ，并在做之前 opam switch reinstall system :

:testweb $ ocamlfind ocamlc -package js_of_ocaml.ppx -linkpkg cubes.ml -o T
Failure("Ast_mapper: OCaml version mismatch or malformed input")
File "cubes.ml", line 1:
Error: Error while running external preprocessor
Command line: /Users/softtimur/.opam/system/lib/js_of_ocaml/./ppx_js '/var/folders/fn/0rmvqqbs4k76lg5g6b7kll100000gn/T/camlppxffe989' '/var/folders/fn/0rmvqqbs4k76lg5g6b7kll100000gn/T/camlppx02e06a'

另一种方式也报错:

:testweb $ ocamlfind ocamlc -package js_of_ocaml -syntax camlp4o -package js_of_ocaml.syntax -linkpkg -o cubes.byte cubes.ml
Fatal error: unknown C primitive `caml_is_printable'
File "cubes.ml", line 1:
Error: Error while running external preprocessor
Command line: camlp4 '-I' '/usr/local/lib/ocaml/camlp4' '-I' '/Users/softtimur/.opam/system/lib/js_of_ocaml' '-parser' 'o' '-parser' 'op' '-printer' 'p' 'pa_js.cmo'  'cubes.ml' > /var/folders/fn/0rmvqqbs4k76lg5g6b7kll100000gn/T/ocamlpp8b28e8

最初:
我最初的目标是编写和编译 cubes.ml这样 1) 它封装了一个 OCaml 函数来创建一个可以在 web 中调用的 JS 函数； 2)OCaml函数和字节码可以在Linux下命令行测试。
cubes.ml如下:

let () =
  let oneArgument (a: int) = a + 100 in
  Js.Unsafe.global##.jsOneArgument := Js.wrap_callback oneArgument;
  print_string "hello\n";
  exit 0

然后，ocamlfind ocamlc -package js_of_ocaml.ppx -linkpkg cubes.ml -o T应该生成 T使得 ./T应该返回 hello .和 js_of_ocaml T -o cubes.js应该生成 cubes.js使得函数 jsOneArgument的 cubes.js可以被其他 JS 或 HTML 文件调用。

在我弄乱包裹之前，./T返回 Unimplemented Javascript primitive caml_pure_js_expr! ，这就是为什么我安装了 npm , node ， 等等...

Answer 1

我切换回 OCaml 4.02.3:

opam switch 4.02.3

然后，

eval `opam config env`

然后，

opam install ppx_tools js_of_ocaml

结果，ocamlfind ocamlc -package js_of_ocaml.ppx -linkpkg cubes.ml -o T生成 T , 和 js_of_ocaml T -o cubes.js生成 cubes.js . node cubes.js确实返回 hello .

然而，./T仍然返回 Unimplemented Javascript primitive caml_pure_js_expr! ，我将为此打开另一个帖子......