ld.lld: error: undefined symbol: hashbrown::raw::Bucket...

[jyn514]

Problem

          ld.lld: error: undefined symbol: hashbrown::raw::Bucket$LT$T$GT$::as_mut::h17a5616906d4548a
          >>> referenced by map.rs:852 (/cargo/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.6.2/src/map.rs:852)
          >>>               rcc-51c66ac989f8d3c5.4ecfujcnmkq7jcjv.rcgu.o:(hashbrown::map::HashMap$LT$K$C$V$C$S$GT$::insert::ha9fbaa5b9f695ac0) in archive /home/joshua/.local/lib/cargo/target/debug/deps/librcc-51c66ac989f8d3c5.rlib
          
          ld.lld: error: undefined symbol: hashbrown::raw::RawTable$LT$T$GT$::reserve::h5da6b3a04cbac1f7
          >>> referenced by map.rs:583 (/cargo/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.6.2/src/map.rs:583)
          >>>               rcc-51c66ac989f8d3c5.4ecfujcnmkq7jcjv.rcgu.o:(hashbrown::map::HashMap$LT$K$C$V$C$S$GT$::reserve::h6e6157315bd86437) in archive /home/joshua/.local/lib/cargo/target/debug/deps/librcc-51c66ac989f8d3c5.rlib
          
          ld.lld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors)
          collect2: error: ld returned 1 exit status

Steps

I am not sure how to replicate this bug. I found it while compiling jyn514/saltwater@efc37d2 with --all-features. I think it might be related to incremental compilation? I have $CARGO_TARGET_DIR set to a global directory and it has a lot of junk in it, in case that matters. I tried rm -rf /home/joshua/.local/lib/cargo/target/debug/deps/*rcc* without success.

Output of cargo version:

cargo 1.43.0 (3532cf738 2020-03-17) (stable)

[jyn514]

I rebuilt with a clean cache and it fixed the issue 🤷

[alexcrichton]

I've transferred this issue to rust-lang/rust since this is unlikely to be a Cargo-specific issue, but thanks for the report!

[jyn514]

I have not run into this in a very long time, I'd be ok with closing it.