Tests compilation fails with "Undefined symbols for architecture x86_64"

[fafhrd91]

Cannot compile tests. Started with 1.65, but I am not sure. I started to use GAT in my library. Reproducible on OSX, Linux, Windows.

Here is link to public build

  = note: Undefined symbols for architecture x86_64:
            "core::future::from_generator::h1dc043fb97652d62", referenced from:
                ntex_mqtt::v5::dispatcher::factory::_$u7b$$u7b$closure$u7d$$u7d$::hc1c12b2e69da9f3b in test_server_v5-71091bd1c6e9897d.6cnbfx9nzh3wubt.rcgu.o
            "core::future::from_generator::h21569d3b120a00ed", referenced from:
                ntex_mqtt::v5::dispatcher::factory::_$u7b$$u7b$closure$u7d$$u7d$::ha65332eee6
....

[fafhrd91]

tests work with "cargo llvm-cov" though

[Noratrieb]

Does it work on the latest nightly?
cc @Swatinem

[fafhrd91]

no, it doesn't

[Swatinem]

If it happens in 1.65, it predates my work to remove core::future::from_generator.

[Swatinem]

Although nightly would print a different linker error?

[fafhrd91]

yes, nightly produces different output

  = note: Undefined symbols for architecture x86_64:
            "core::future::identity_future::hc6c42408f0556a34", referenced from:
                subs::main::hfe24f8373e798c51 in subs-215ee2078c3fd6c3.2jehmlx5juwji94z.rcgu.o
            "ntex_rt::builder::SystemRunner::block_on::h8f82d2ac5177ec22", referenced from:
                subs::main::hfe24f8373e798c51 in subs-215ee2078c3fd6c3.2jehmlx5juwji94z.rcgu.o
          ld: symbol(s) not found for architecture x86_64
          clang: error: linker command failed with exit code 1 (use -v to see invocation)

[Swatinem]

            "ntex_rt::builder::SystemRunner::block_on::h8f82d2ac5177ec22", referenced from:
                subs::main::hfe24f8373e798c51 in subs-215ee2078c3fd6c3.2jehmlx5juwji94z.rcgu.o

That doesn’t involve any async internals, though it might include inlined things.

[fafhrd91]

here link to GitHub action with failures with different versions of rust

https://github.com/ntex-rs/ntex-mqtt/actions/runs/4053694163

[eholk]

It'd be good to get a smaller test case if possible! It may not be directly async related.