使兼容ocaml的，camlp4，PPX，节点，js_of_ocaml，ocamlbuild

安装npm和node，编译OCaml的文件与js_of_ocaml了错误后，因此我做了opam switch reinstall system：使兼容ocaml的，camlp4，PPX，节点，js_of_ocaml，ocamlbuild

: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没有工作了：

: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给出3.8.6; ocaml -version给出The OCaml toplevel, version 4.03.0。 js_of_ocaml --version是2.7，但是在opam swtich reinstall system之后，它给出了-bash: /Users/softtimur/.opam/system/bin/js_of_ocaml: No such file or directory。

有谁知道该怎么做才能使所有这些软件包兼容？

早些时候：这里是编译错误安装npm和node，后做opam switch reinstall system前：

: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'

另一种方式也给了一个错误：

: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函数来创建一个可以在web中调用的JS函数; 2）可以在Linux下的命令行中测试OCaml函数和字节码。

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应该产生T这样./T应返回hello。并且js_of_ocaml T -o cubes.js应该生成cubes.js，使得cubes.js的功能jsOneArgument可以很好地被其他JS或HTML文件调用。

之前我搞砸了包，./T回到Unimplemented Javascript primitive caml_pure_js_expr!，这就是为什么我安装npm，node，等...

来源

2016-05-16 SoftTimur

是不是'$节点cubes.js'就够了吗？ – zakki

你的意思是在命令行中运行'node cubes.js'吗？你能否详细说明一下？ – SoftTimur

是的。 node.js在Linux下的命令行中输出'hello'。 – zakki

我切换回OCaml的4.02.3：

opam switch 4.02.3

然后，

eval `opam config env`

然后，

opam install ppx_tools js_of_ocaml

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

然而，./T仍返回Unimplemented Javascript primitive caml_pure_js_expr!，我会打开另一个职位是...

来源

2016-05-19 09:15:31 SoftTimur

请注意它应该是''eval'opam config env''（反引号）或'eval $（opam config env）'（备用bash语法），简单的引号不会。 – gasche

确定...已更正... – SoftTimur

使兼容ocaml的，camlp4，PPX，节点，js_of_ocaml，ocamlbuild

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