https://hydra.nixos.org/eval/1464629

This looks good but please don't merge until we can figure out the libiconv in iOS.

libiconv

This is very interesting, because today I discovered that after updating the channel I no longer can build even a trivial program that uses text on macOS (no cross-compiling involved):

Undefined symbols for architecture x86_64:
  "_iconv", referenced from:
      _hs_iconv in libHSbase-4.9.1.0.a(iconv.o)
     (maybe you meant: <...> )
  "_iconv_close", referenced from:
      _hs_iconv_close in libHSbase-4.9.1.0.a(iconv.o)
     (maybe you meant: _hs_iconv_close)
  "_iconv_open", referenced from:
      _hs_iconv_open in libHSbase-4.9.1.0.a(iconv.o)
     (maybe you meant: _hs_iconv_open)
  "_locale_charset", referenced from:
      _localeEncoding in libHSbase-4.9.1.0.a(PrelIOUtils.o)
ld: symbol(s) not found for architecture x86_64

If there are problems, cross or native, with base libraries, we should solve them another way.#42069 should cover.

@kirelagin Did you solve this problem?

@mpickering No, but I do plan to work on it this week, you can follow #42069.

I would suggest this be reverted until the problems are resolved.

arg max problems? I don't think this one is to blame, is it?

It could be actually which is very unfortunate because the depsBuildBuild things is definitely correct.

This patch is responsible for the problems mentioned in #42247 (comment) according to @kirelagin

@mpickering But are you sure it's not the separate setup db thing? That seemed much more likely to me.

I am not sure. I tried reverting the patch but it caused a lot of rebuilding so I haven't been able to confirm yet.

You should try this branch if you have a free machine & some extra time:

https://github.com/matthewbauer/nixpkgs/tree/ghc-macos-argmax-fix

@matthewbauer Starting the builds now...