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9428 :: Error when cross-compiling Nim with mingw

• Nlits (orginal) [2022-09-01T17:34:48+02:00] view original

  I get this error:

  /nix/store/ap7nr6hb3q9zhphcy2s2bmxvvv
  g1yzcq-nim-unwrapped-1.4.8/nim/lib/pu
  re/dynlib.nim(110, 25) Error: undecla
  red identifier:
  "getEnv'
  This might be caused by a recursive m
  odule dependency:
  /nix/store/ap7nr6hb3q9zhphcy2s2bmxvvV
  g1yzcq-nim-unwrapped-1.4.8/nim/lib/pu
  re/os.nim imports /nix/store/ap7nr6hb
  3q9zhphcy2s2bmxvvvg1yzcq-nim-unwrappe
  d-1.4.8/nim/lib/windows/winlean.nim
  /nix/store/ap7nr6hb3q9zhphcy2s2bmxvVV
  g1yzcq-nim-unwrapped-1.4.8/nim/lib/wi
  ndows/winlean.nim imports /nix/store/
  ap7nr6hb3q9zhphcy2s2bmxvvvg1yzcq-nim-
  unwrapped-1.4.8/nim/lib/pure/dynlib.nim
  /nix/store/ap7nr6hb3q9zhphcy2s2bmxvVV
  g1yzcq-nim-unwrapped-1.4.8/nim/lib/pu
  re/dynlib.nim imports /nix/store/ap7n
  r6hb3q9zhphcy2s2bmxvvvg1yzcq-nim-unwr
  apped-1.4.8/nim/lib/pure/os.nim
  Run

  When compiling with this cmd:

  nim compile -d:mingw path/to/myfile

  My imports in my file are:

  import std/httpclient
  import std/json
  import std/strformat
  import std/strutils
  import std/tables
  import std/os
  Run

  Why would this happen? This only affects cross-compiling, normal compiling works fine. Any help would be appreciated.

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• cyraxjoe (orginal) [2022-09-02T05:43:45+02:00] view original

  This is a problem that apparently is caused by a local patch that the NixOS devs are applying to nim.

  From a high-level view, it seems that the patch is trying to call getEnv while trying to resolve the mingw dynlib dependencies.

  To demonstrate you can give it a try with (this will compile nim without the patch):

  nix-shell -p 'nim-unwrapped.overrideAttrs (old: {patches = []; })' pkgsCross.mingwW64.buildPackages.gcc`

  Add a nim.cfg with the path to the bin dir of the mingw gcc: dirname $(which x86_64-w64-mingw32-gcc), resulting in something like:

  amd64.windows.gcc.path = "/nix/store/x4x1gjdxcfln8jprf6vfnkqplb361822-x86_64-w64-mingw32-stage-final-gcc-debug-wrapper-11.3.0/bin"

  And then compile as usual nim c -d:mingw <file.nim>

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