nimforum mirror - Nimler not working on macOS

JSONBash (orginal) [2022-02-13T09:01:25+01:00] view original

I am looking to get the nimler module (https://github.com/wltsmrz/nimler) working on macOS and when executing the compile step I get the following errors:

Undefined symbols for architecture x86_64:
  "_enif_get_long", referenced from:
      _fromTerm__nim95elixir95test_43 in @mnim_elixir_test.nim.c.o
  "_enif_make_badarg", referenced from:
      _zadd__nim95elixir95test_33 in @mnim_elixir_test.nim.c.o
  "_enif_make_long", referenced from:
      _toTerm__OOZOOZOOZOOZOOZOnimbleZpkgsZnimler4552O54O48ZnimlerZcodec_146 in @mnim_elixir_test.nim.c.o
ld: symbol(s) not found for architecture x86_64

I am not super experienced in C or Nim so some help would be appreciated :)

elcritch (orginal) [2022-02-14T23:39:13+01:00] view original

I tested it, and couldn't figure out what was wrong. I believe it may be some change in either Erlang headers or Nim's C compiler flags or Clang. Looks like there's an issue for it https://github.com/wltsmrz/nimler/issues/20.

sls1005 (orginal) [2022-02-15T04:51:13+01:00] view original

It looks like that a C library was not linked. An error reported by ld means it can compile but cannot link. Try to tell the compiler which library to link by using some --passL.

JSONBash (orginal) [2022-02-15T22:56:15+01:00] view original

yeah but there has not been activity for a couple months, and I wanted to see if I could get it working for myself

JSONBash (orginal) [2022-02-15T23:24:24+01:00] view original

I believe that is done by the library:

'clang   -shared -o /Users/JSONBash/work/monto/elixir/nim-elixir-test/src/libnim_elixir_test.dylib
/Users/JSONBash/.cache/nim/nim_elixir_test_d/stdlib_digitsutils.nim.c.o
/Users/JSONBash/.cache/nim/nim_elixir_test_d/stdlib_assertions.nim.c.o
/Users/JSONBash/.cache/nim/nim_elixir_test_d/stdlib_dollars.nim.c.o
/Users/JSONBash/.cache/nim/nim_elixir_test_d/stdlib_system.nim.c.o
/Users/JSONBash/.cache/nim/nim_elixir_test_d/stdlib_posix.nim.c.o
/Users/JSONBash/.cache/nim/nim_elixir_test_d/stdlib_times.nim.c.o
/Users/JSONBash/.cache/nim/nim_elixir_test_d/@mnim_elixir_test.nim.c.o  -lm -lm  -dynamiclib  -ldl'

This is where the linker fails

JSONBash (orginal) [2022-02-16T02:58:43+01:00] view original

I solved getting it to work on my mac with M1, thanks to treeform for helping with the nimble file. My project is named nim_elixir_test, so for anyone in the future you should just need to change that name:

task bindings, "Generate Bindings":
  proc compile(libName: string, flags = "") =
    exec "nim c -f " & flags & " -d:release --app:lib --gc:arc -d:nimlerGenWrapper --passL:'- undefined dynamic_lookup' --out:" & libName & " --outdir:bindings/generated src/nim_elixir_test.nim"
  
  when defined(windows):
    compile "nim_elixir-test.dll"
  
  elif defined(macosx):
    compile "libnim_elixir_test.dylib.arm", "--cpu:arm64 -l:'-target arm64-apple-macos11' -t:'-target arm64-apple-macos11'"
    compile "libnim_elixir_test.dylib.x64", "--cpu:amd64 -l:'-target x86_64-apple-macos10.12' -t:'-target x86_64-apple-macos10.12'"
    exec "lipo bindings/generated/libnim_elixir_test.dylib.arm bindings/generated/libnim_elixir_test.dylib.x64 -output bindings/generated/libnim_elixir_test.dylib -create"
    exec "mv bindings/generated/libnim_elixir_test.dylib src/libnim_elixir_test.dylib.arm.so && mv bindings/generated/NumberAdder.ex src/NumberAdder.ex"
  
  else:
    compile "libnim_elixir_test.so"

The important parts to note:

in the compile, the passL flag gets over the undefined symbols and will lookup at runtime

in the macosx block, it is compiling with x86_64 and arm64 targets then using lipo to build a single one with both supported architectures

the moving is putting the lib back in the src to be called with NumberAdder.ex file

I had to rename my .dylib to be .dylib.arm.so because that is what the Nif wanted, yours might be different

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8908 :: Nimler not working on macOS