`iconv` linker errors on OSX

[AesaKamar]

In particular, I'm running from the Atom IDE engine.

The Atom integration invokes this command:

/Users/aesa/Code/Nix/haskell-ide-engine/.stack-work/install/x86_64-osx-nix/lts-11.17/8.2.2/libexec/x86_64-osx-ghc-8.2.2/cabal-helper-0.8.0.4/cabal-helper-wrapper \
"--with-ghc=/nix/store/akpfx4dwldj6s6rvnamnc24lkaxgrhl2-ghc-8.2.2/bin/ghc" \
"--with-ghc-pkg=/nix/store/akpfx4dwldj6s6rvnamnc24lkaxgrhl2-ghc-8.2.2/bin/ghc-pkg" \
"--with-cabal=cabal" \
"/Users/aesa/Code/Katas/Day19" \
"/Users/aesa/Code/Katas/Day19/.stack-work/dist/x86_64-osx-nix/Cabal-2.0.1.0" \
"package-db-stack" \
"flags" \
"compiler-version" \
"ghc-merged-pkg-options" \
"config-flags" \
"non-default-config-flags" \
"ghc-src-options" \
"ghc-pkg-options" \
"ghc-lang-options" \
"ghc-options" \
"source-dirs" \
"entrypoints" \
"needs-build-output"

The corresponding output from that operation is:

Linking /Users/aesa/.cache/cabal-helper/cabal-helper0.8.0.4-Cabal2.0.1.0 ...
clang-5.0: warning: argument unused during compilation: '-nopie' [-Wunused-command-line-argument]
clang-5.0: warning: argument unused during compilation: '-nopie' [-Wunused-command-line-argument]
Undefined symbols for architecture x86_64:
  "_iconv", referenced from:
      _hs_iconv in libHSbase-4.10.1.0.a(iconv.o)
     (maybe you meant: _base_GHCziIOziEncodingziIconv_iconvEncoding_closure, _base_GHCziIOziEncodingziIconv_iconvEncoding1_info , _base_GHCziIOziEncodingziIconv_iconvEncoding4_closure , _base_GHCziIOziEncodingziIconv_iconvEncoding7_closure , _base_GHCziIOziEncodingziIconv_iconvEncoding14_closure , _base_GHCziIOziEncodingziIconv_iconvEncoding4_info , _base_GHCziIOziEncodingziIconv_iconvEncoding6_closure , _hs_iconv , _base_GHCziIOziEncodingziIconv_iconvEncoding5_closure , _base_GHCziIOziEncodingziIconv_iconvEncoding8_info , _hs_iconv_open , _base_GHCziIOziEncodingziIconv_iconvEncoding10_closure , _hs_iconv_close , _base_GHCziIOziEncodingziIconv_iconvEncoding10_info , _base_GHCziIOziEncodingziIconv_iconvEncoding11_info , _base_GHCziIOziEncodingziIconv_iconvEncoding12_info , _base_GHCziIOziEncodingziIconv_iconvEncoding2_closure , _base_GHCziIOziEncodingziIconv_iconvEncoding2_info , _base_GHCziIOziEncodingziIconv_iconvEncoding_info , _base_GHCziIOziEncodingziIconv_iconvEncoding8_closure , _base_GHCziIOziEncodingziIconv_iconvEncoding9_closure , _base_GHCziIOziEncodingziIconv_iconvEncoding9_info , _base_GHCziIOziEncodingziIconv_iconvEncoding3_closure , _base_GHCziIOziEncodingziIconv_iconvEncoding6_info , _base_GHCziIOziEncodingziIconv_iconvEncoding12_closure , _base_GHCziIOziEncodingziIconv_iconvEncoding11_closure , _base_GHCziIOziEncodingziIconv_iconvEncoding14_info , _base_GHCziIOziEncodingziIconv_iconvEncoding7_info , _base_GHCziIOziEncodingziIconv_iconvEncoding13_bytes , _base_GHCziIOziEncodingziIconv_iconvEncoding1_closure )
  "_iconv_open", referenced from:
      _hs_iconv_open in libHSbase-4.10.1.0.a(iconv.o)
     (maybe you meant: _hs_iconv_open)
  "_iconv_close", referenced from:
      _hs_iconv_close in libHSbase-4.10.1.0.a(iconv.o)
     (maybe you meant: _hs_iconv_close)
  "_locale_charset", referenced from:
      _localeEncoding in libHSbase-4.10.1.0.a(PrelIOUtils.o)
ld: symbol(s) not found for architecture x86_64
clang-5.0: error: linker command failed with exit code 1 (use -v to see invocation)
`cc' failed in phase `Linker'. (Exit code: 1)

Worth Noting:
iconv --version

iconv (GNU libiconv 1.11)
Copyright (C) 2000-2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Bruno Haible.

And iconv is installed under /usr/bin/iconv
I guess it came with the system?

[AesaKamar]

I've also come across this stack overflow thread.

https://stackoverflow.com/questions/43359289/architecture-x86-64-while-running-haskell-code-haskell-osx-iconv

However, I don't know how to determine where the other libiconv dependencies might be, other than the binary.

Thanks in advance

[AesaKamar]

I've also followed along with the suggestions put forth in this issue thread
commercialhaskell/stack#825

But to no avail. /:

[PaulAtFormation]

👍

Having exactly the same issue with Nix 2.1, from which I've installed stack and cabal-install, and used them to build haskell-ide-engine from source, on macOS 10.13.6.

[AesaKamar]

I've also come across this (all the way back from 2011)
http://blog.omega-prime.co.uk/2011/01/28/solving-ghc-iconv-problems-on-os-x-10-6/

But I didn't have success in fixing the iconv linker error.

[lukel97]

@AesaKamar Can you check that /usr/lib/libiconv.dylib exists? And if it does that nm /usr/lib/libiconv.dylib | grep _locale_charset returns some address?

[AesaKamar]

• /usr/lib/libiconv.dylib does exist
• nm /usr/lib/libiconv.dylib | grep _locale_charset returns 0000000000014ac7 T _locale_charset

And which iconv yields /usr/bin/iconv

[lrworth]

FWIW, not directly related to haskell-ide-engine, but I've been having trouble building anything with cabal after installing it with Nix, and just got it working by introducing a -liconv to the build command. Adding this to my cabal file worked:

extra-libraries: iconv