制作兼容的ocaml, camlp4, ppx, node, js_of_ocaml, ocamlbuild

Question

安装 npm 和 node 后，用 js_of_ocaml 编译 OCaml 文件出错，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 给出 v6.1.0； npm --version 给出 3.8.6； ocaml -version 给出 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 npm 和 node 之后以及执行 opam switch reinstall system 之前的编译错误：

: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) 它包装一个 OCaml 函数来制作一个可以在 web 中调用的 JS 函数； 2) OCaml函数和字节码可以在Linux.

下的命令行中测试

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，这样 ./T 应该 return hello。而js_of_ocaml T -o cubes.js应该生成cubes.js，这样cubes.js的函数jsOneArgument就可以很好的被其他JS或者HTML文件调用。

在我弄乱软件包之前，./T return编辑了 Unimplemented Javascript primitive caml_pure_js_expr!，这就是我安装 npm、node 等的原因...

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，js_of_ocaml T -o cubes.js生成cubes.js。 node cubes.js return hello.

不过，./T还是returnUnimplemented Javascript primitive caml_pure_js_expr!，我打算再开一个post...

制作兼容的ocaml, camlp4, ppx, node, js_of_ocaml, ocamlbuild

Make compatible ocaml, camlp4, ppx, node, js_of_ocaml, ocamlbuild

ocaml

camlp4

opam

js-of-ocaml

ppx