Build error - hello-reason example - macOS host, iOS simulator target

[dboris]

Trying to build the hello-reason example under macOS 11.5.2:

% esy generate ios.simulator.x86_64
...
    Undefined symbols for architecture x86_64:
      "_libiconv", referenced from:
          _g_iconv in libglib-2.0.a(libglib_2_0_la-gconvert.o)
          _g_convert_with_iconv in libglib-2.0.a(libglib_2_0_la-gconvert.o)
          _g_convert_with_fallback in libglib-2.0.a(libglib_2_0_la-gconvert.o)
      "_libiconv_close", referenced from:
          _g_iconv_close in libglib-2.0.a(libglib_2_0_la-gconvert.o)
          _g_convert in libglib-2.0.a(libglib_2_0_la-gconvert.o)
          _g_convert_with_fallback in libglib-2.0.a(libglib_2_0_la-gconvert.o)
          _g_filename_display_name in libglib-2.0.a(libglib_2_0_la-gconvert.o)
      "_libiconv_open", referenced from:
          _g_iconv_open in libglib-2.0.a(libglib_2_0_la-gconvert.o)
    ld: symbol(s) not found for architecture x86_64
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    make[2]: *** [pkg-config] Error 1
    make[1]: *** [all-recursive] Error 1
    make: *** [all] Error 2
    error: command failed: 'make' (exited with 2)
    esy-build-package: exiting with errors above...
    
  building yarn-pkg-config@github:esy-ocaml/yarn-pkg-config#db3a0b63883606dd57c54a7158d560d6cba8cd79

[EduardoRFS]

Can you give me your esy.json? So that I can reproduce, but my bet is that it's some package which doesn't work well on macOS 11.5

[dboris]

I cloned this repo, then cd examples/hello-reason, then followed the readme to build it. I don't see esy.json in that dir. Below is the package.json:

{
  "name": "hello-reason",
  "version": "0.0.0",
  "esy": { "build": "dune build @all" },
  "scripts": { "start": "#{self.target_dir}/default/bin/hello.exe" },
  "dependencies": {
    "@opam/reason": "^3.7.0",
    "@opam/dune": "*",
    "@reason-native/console": "^0.1.0",
    "@reason-native/pastel": "^0.3.0",
    "ocaml": "4.12.x"
  },
  "resolutions": {
    "@esy-ocaml/reason":
      "EduardoRFS/reason:reason.json#35aa4df3de0daa60bdc1133dcf97855decac48f7"
  },
  "devDependencies": {
    "generate":
      "github:EduardoRFS/reason-mobile:generate.json#7ba258319b87943d2eb0d8fb84562d0afeb2d41f"
  }
}

On the other hand, there is an esy.lock dir in there. Am I not doing something right?

[EduardoRFS]

@dboris you're probably following it right, not sure why the problem is happening, my guest is that Apple did something again and I need to fix this.

[dboris]

This SO comment gives a hint. How can I tell esy to link to libiconv from a specific directiory?