Using a public module that uses a private module in main.rs causes linking errors

[fables-tales]

Copied from: https://stackoverflow.com/questions/29186299/compilation-linking-error-undefined-symbols-for-architecture-x86-64

I have no idea what I'm doing, this is my first serious attempt to do anything with rust.

I'm writing a project that this: line https://github.com/samphippen/rexchange/blob/master/src/lib.rs#L1 in it's lib.rs. When I typed cargo build I got the following output:

   $ cargo build --verbose
       Fresh log v0.2.5
       Fresh rustc-serialize v0.3.6
       Fresh libc v0.1.3
       Fresh rand v0.1.4
       Fresh uuid v0.1.11
   Compiling rexchange v0.0.1 (file:///Users/sam/dev/rexchange)
     Running `rustc src/main.rs --crate-name rexchange --crate-type bin -g --out-dir /Users/sam/dev/rexchange/target/debug --emit=dep-info,link -L dependency=/Users/sam/dev/rexchange/target/debug -L dependency=/Users/sam/dev/rexchange/target/debug/deps --extern uuid=/Users/sam/dev/rexchange/target/debug/deps/libuuid-f80da2be6e37bdc9.rlib --extern rexchange=/Users/sam/dev/rexchange/target/debug/librexchange-436e10ddf2e26a6f.rlib`
error: linking with `cc` failed: exit code: 1
note: "cc" "-m64" "-L" "/usr/local/lib/rustlib/x86_64-apple-darwin/lib" "-o" "/Users/sam/dev/rexchange/target/debug/rexchange" "/Users/sam/dev/rexchange/target/debug/rexchange.o" "-Wl,-force_load,/usr/local/lib/rustlib/x86_64-apple-darwin/lib/libmorestack.a" "-Wl,-dead_strip" "-nodefaultlibs" "/Users/sam/dev/rexchange/target/debug/librexchange-436e10ddf2e26a6f.rlib" "/Users/sam/dev/rexchange/target/debug/deps/libuuid-f80da2be6e37bdc9.rlib" "/Users/sam/dev/rexchange/target/debug/deps/librustc-serialize-6bb45c0d7c639d54.rlib" "/Users/sam/dev/rexchange/target/debug/deps/librand-6dfe5258ada5ebf2.rlib" "/Users/sam/dev/rexchange/target/debug/deps/liblibc-2a692f33a70517c8.rlib" "/usr/local/lib/rustlib/x86_64-apple-darwin/lib/libstd-4e7c5e5c.rlib" "/usr/local/lib/rustlib/x86_64-apple-darwin/lib/libcollections-4e7c5e5c.rlib" "/usr/local/lib/rustlib/x86_64-apple-darwin/lib/libunicode-4e7c5e5c.rlib" "/usr/local/lib/rustlib/x86_64-apple-darwin/lib/librand-4e7c5e5c.rlib" "/usr/local/lib/rustlib/x86_64-apple-darwin/lib/liballoc-4e7c5e5c.rlib" "/usr/local/lib/rustlib/x86_64-apple-darwin/lib/liblibc-4e7c5e5c.rlib" "/usr/local/lib/rustlib/x86_64-apple-darwin/lib/libcore-4e7c5e5c.rlib" "-L" "/Users/sam/dev/rexchange/target/debug" "-L" "/Users/sam/dev/rexchange/target/debug/deps" "-L" "/usr/local/lib/rustlib/x86_64-apple-darwin/lib" "-L" "/Users/sam/dev/rexchange/.rust/lib/x86_64-apple-darwin" "-L" "/Users/sam/dev/rexchange/lib/x86_64-apple-darwin" "-lc" "-lm" "-lSystem" "-lpthread" "-lc" "-lm" "-lcompiler-rt"
note: ld: warning: directory not found for option '-L/Users/sam/dev/rexchange/.rust/lib/x86_64-apple-darwin'
ld: warning: directory not found for option '-L/Users/sam/dev/rexchange/lib/x86_64-apple-darwin'
Undefined symbols for architecture x86_64:
  "orders::BidOrder::get_account_id::hbe8193f627eb0daf4ba", referenced from:
      main::h6e33cd0005718795haa in rexchange.o
  "orders::BidOrder::get_currency_price::hac0a15cbc8d29001Gba", referenced from:
      main::h6e33cd0005718795haa in rexchange.o
  "orders::BidOrder::get_commodity_amount::hce97000d2a1749beSba", referenced from:
      main::h6e33cd0005718795haa in rexchange.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

error: aborting due to previous error
Could not compile `rexchange`.

Caused by:
  Process didn't exit successfully: `rustc src/main.rs --crate-name rexchange --crate-type bin -g --out-dir /Users/sam/dev/rexchange/target/debug --emit=dep-info,link -L dependency=/Users/sam/dev/rexchange/target/debug -L dependency=/Users/sam/dev/rexchange/target/debug/deps --extern uuid=/Users/sam/dev/rexchange/target/debug/deps/libuuid-f80da2be6e37bdc9.rlib --extern rexchange=/Users/sam/dev/rexchange/target/debug/librexchange-4

I wasn't expecting this at all, my main.rs doesn't reference those symbols exactly: https://github.com/samphippen/rexchange/blob/master/src/main.rs and also I'd expect a rust error and not a linker level error from clang (if this is an error).

My Rust compiler version is:

$ rustc --version
rustc 1.0.0-nightly (3e4be02b8 2015-03-13) (built 2015-03-13)

My Cargo version is:

$ cargo --version
cargo 0.0.1-pre-nightly (66849de 2015-03-10) (built 2015-03-11)

marking the orders module as public fixed the issue.

[steveklabnik]

not exactly an ICE but close enough

[alexcrichton]

I believe this is a dupe of #16734, so closing in favor of that, but thanks for the report!