Fails to compile when libiconv is installed via MacPorts [upstream]

[valin4tor]

How to reproduce:

1. Use an Apple Silicon Mac Install libiconv with MacPorts: sudo port install libiconv (or something which depends on it)
2. Run cargo install cargo-outdated or cargo install --locked cargo-outdated

Expected result:

The crate installs successfully

Actual result:

   Compiling cargo-outdated v0.9.14
error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-arch" "arm64" "-L" "/Users/david/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-apple-darwin/lib" "/var/folders/jr/q6_vllf57zd745fg100232y80000gn/T/cargo-installXrbgCB/release/deps/cargo_outdated-c4ee5d7a9cf983a4.cargo_outdated.41ebcblh-cgu.15.rcgu.o" "-o" "/var/folders/jr/q6_vllf57zd745fg100232y80000gn/T/cargo-installXrbgCB/release/deps/cargo_outdated-c4ee5d7a9cf983a4" "-Wl,-dead_strip" "-nodefaultlibs" "-L" "/var/folders/jr/q6_vllf57zd745fg100232y80000gn/T/cargo-installXrbgCB/release/deps" "-L" "/Library/Developer/CommandLineTools/usr/lib/clang/12.0.5/lib/darwin" "-L" "/var/folders/jr/q6_vllf57zd745fg100232y80000gn/T/cargo-installXrbgCB/release/build/curl-sys-2c9ba7d4862c5909/out/build" "-L" "/var/folders/jr/q6_vllf57zd745fg100232y80000gn/T/cargo-installXrbgCB/release/build/libnghttp2-sys-b4d6a653383d59d5/out/i/lib" "-L" "/var/folders/jr/q6_vllf57zd745fg100232y80000gn/T/cargo-installXrbgCB/release/build/libgit2-sys-501fff0ebabe1cac/out/build" "-L" "/var/folders/jr/q6_vllf57zd745fg100232y80000gn/T/cargo-installXrbgCB/release/build/libssh2-sys-abe7f7ce6f3d9fd3/out/build" "-L" "/opt/local/lib" "-L" "/Users/david/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-apple-darwin/lib" "/var/folders/jr/q6_vllf57zd745fg100232y80000gn/T/rustcEcBdGX/liblibgit2_sys-b602b1b169935df3.rlib" "/var/folders/jr/q6_vllf57zd745fg100232y80000gn/T/rustcEcBdGX/liblibssh2_sys-48ff383a0cab2867.rlib" "/var/folders/jr/q6_vllf57zd745fg100232y80000gn/T/rustcEcBdGX/libcurl_sys-9f992448e8dafaf8.rlib" "/var/folders/jr/q6_vllf57zd745fg100232y80000gn/T/rustcEcBdGX/liblibnghttp2_sys-a72e6424bf044ccd.rlib" "/Users/david/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-apple-darwin/lib/libcompiler_builtins-d11cefe128d6b458.rlib" "-framework" "CoreFoundation" "-liconv" "-framework" "Security" "-framework" "CoreFoundation" "-lssl" "-lcrypto" "-lclang_rt.osx" "-framework" "Security" "-framework" "CoreFoundation" "-lz" "-lSystem" "-lresolv" "-lc" "-lm"
  = note: Undefined symbols for architecture arm64:
            "_iconv", referenced from:
                _git_path_iconv in liblibgit2_sys-b602b1b169935df3.rlib(path.o)
               (maybe you meant: _git_path_iconv_init_precompose, _git_path_iconv_clear , _git_path_iconv )
            "_iconv_open", referenced from:
                _git_path_direach in liblibgit2_sys-b602b1b169935df3.rlib(path.o)
                _git_path_iconv_init_precompose in liblibgit2_sys-b602b1b169935df3.rlib(path.o)
                _git_path_diriter_init in liblibgit2_sys-b602b1b169935df3.rlib(path.o)
            "_iconv_close", referenced from:
                _git_path_direach in liblibgit2_sys-b602b1b169935df3.rlib(path.o)
                _git_path_iconv_clear in liblibgit2_sys-b602b1b169935df3.rlib(path.o)
                _git_path_diriter_free in liblibgit2_sys-b602b1b169935df3.rlib(path.o)
                _git_path_dirload in liblibgit2_sys-b602b1b169935df3.rlib(path.o)
          ld: symbol(s) not found for architecture arm64
          clang: error: linker command failed with exit code 1 (use -v to see invocation)


error: aborting due to previous error

error: failed to compile `cargo-outdated v0.9.14`, intermediate artifacts can be found at `/var/folders/jr/q6_vllf57zd745fg100232y80000gn/T/cargo-installXrbgCB`

System information:

OS: macOS 11.3 Beta (20E5172i)
CLT version: Command Line Tools for Xcode 12.5 beta
Rust version: rustc 1.50.0 (cb75ad5db 2021-02-10)

Search terms: arm64, Apple Silicon

[valin4tor]

I think this is what's going on: rust-lang/rust#36250 (comment) (I also have libiconv installed via MacPorts)

Will look through that thread to see what solutions are available - it seems like this crate isn't responsible for the problem, seeing as I've now also encountered it when attempting to install the cargo-edit crate

[valin4tor]

Aha, this is the root issue: rust-lang/git2-rs#263

Closing as this seems to be an upstream bug and I've now found a workaround, but feel free to reopen if required :)