inventory breaks linking

[ckaran]

🐛 Bug Reports

I'm having linking errors when using v0.6.0-alpha.2 which I didn't have when using v0.6.0-alpha.1. The complete set of errors is at the end of this post, but the summary is that many python symbols are missing. I ran git bisect for all revisions between v0.6.0-alpha.1 and v0.6.0-alpha.2, and found that the first bad commit was ae8a37c.

🌍 Environment

• Your operating system and version:
  Linux EMANE 4.15.0-45-generic some of PyNumberProtocol methods are broken #48-Ubuntu SMP Tue Jan 29 16:28:13 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux, Ubuntu 18.04.
• Your python version:
  Python 3.7.1 [GCC 7.3.0]
• How did you install python (e.g. apt or pyenv)? Did you use a virtualenv?:
  Built from source, installed it to the default system location (/usr/local/bin/python3)
• Your rust version (rustc --version):
  rustc 1.34.0-nightly (4b1e39b7b 2019-02-05)
• Are you using the latest pyo3 version? Have you tried using latest master (replace version = "0.x.y" with git = "https://github.com/PyO3/pyo3")?
  I did try the latest master (9e53418) and the problem persisted (may have gotten worse, I didn't check the outputs between v0.6.0-alpha.2 and 9e53418).

💥 Reproducing

I tried creating a minimal example, but the minimal example fails to compile under v0.6.0-alpha.1 with the following:

error[E0119]: conflicting implementations of trait `pyo3::class::methods::PyMethodsProtocolImpl` for type `PyChannelIdentifier`:
  --> src/lib.rs:14:1
   |
14 | #[pymethods]
   | ^^^^^^^^^^^^
   |
   = note: conflicting implementation in crate `pyo3`:
           - impl<T> pyo3::class::methods::PyMethodsProtocolImpl for T;

error: aborting due to previous error

For more information about this error, try `rustc --explain E0119`.
error: Could not compile `pyo3_bug_report`.

And the same example compiles under v0.6.0-alpha.2, but fails to lead into python with the following
error:

cfkaran2@EMANE:~/Desktop/pyo3_bug_report/target/release$ python3
Python 3.7.1 (default, Nov 13 2018, 16:55:45) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyo3_bug_report
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dynamic module does not define module export function (PyInit_pyo3_bug_report)
>>> 

This is all very weird, because I can compile and load my regular code without any trouble. If you can tell me what to do to get around these bugs, I can create a new minimal example to show you.

Compiler output:

    Updating git repository `https://github.com/SergiusIW/collider-rs`
    Updating crates.io index
   Compiling semver-parser v0.7.0
   Compiling libc v0.2.48
   Compiling autocfg v0.1.2
   Compiling proc-macro2 v0.4.27
   Compiling memchr v2.1.3
   Compiling rand_core v0.4.0
   Compiling arrayvec v0.4.10
   Compiling cfg-if v0.1.6
   Compiling spin v0.4.10
   Compiling unicode-xid v0.1.0
   Compiling ucd-util v0.1.3
   Compiling nodrop v0.1.13
   Compiling regex v1.1.0
   Compiling proc-macro-hack-impl v0.4.1
   Compiling memoffset v0.2.1
   Compiling utf8-ranges v1.0.2
   Compiling scopeguard v0.3.3
   Compiling num-traits v0.2.6
   Compiling version_check v0.1.5
   Compiling remove_dir_all v0.5.1
   Compiling rayon-core v1.4.1
   Compiling byteorder v1.3.1
   Compiling fnv v1.0.6
   Compiling bit-vec v0.5.0
   Compiling quick-error v1.2.2
   Compiling rayon v1.0.3
   Compiling either v1.5.0
   Compiling bitflags v1.0.4
   Compiling spin v0.5.0
   Compiling rand_chacha v0.1.1
   Compiling rand v0.6.5
   Compiling semver v0.9.0
   Compiling crossbeam-utils v0.2.2
   Compiling rand_core v0.3.1
   Compiling rand_jitter v0.1.3
   Compiling lazy_static v1.2.0
   Compiling regex-syntax v0.6.5
   Compiling proc-macro-hack v0.4.1
   Compiling collider v0.3.1 (https://github.com/SergiusIW/collider-rs#56b667fb)
   Compiling bit-set v0.5.0
   Compiling rand_xorshift v0.1.1
   Compiling rand_isaac v0.1.1
   Compiling rand_hc v0.1.0
   Compiling thread_local v0.3.6
   Compiling rustc_version v0.2.3
   Compiling rand_os v0.1.2
   Compiling wait-timeout v0.1.5
   Compiling num_cpus v1.9.0
   Compiling quote v0.6.11
   Compiling mashup-impl v0.1.9
   Compiling crossbeam-epoch v0.3.1
   Compiling rand_pcg v0.1.1
   Compiling aho-corasick v0.6.9
   Compiling noisy_float v0.1.9
   Compiling syn v0.15.26
   Compiling mashup v0.1.9
   Compiling crossbeam-deque v0.2.0
   Compiling tempfile v3.0.5
   Compiling uuid v0.7.2
   Compiling pyo3 v0.6.0-alpha.2
   Compiling rusty-fork v0.2.1
   Compiling proptest v0.9.0
   Compiling ctor v0.1.7
   Compiling pyo3-derive-backend v0.6.0-alpha.2
   Compiling inventory-impl v0.1.3
   Compiling ghost v0.1.0
   Compiling proptest-derive v0.1.0
   Compiling inventory v0.1.3
   Compiling pyo3cls v0.6.0-alpha.2
   Compiling py_disc_model v0.1.0 (/home/cfkaran2/Documents/rust_learning/py_disc_model)
warning: unused import: `proptest_derive::Arbitrary`
 --> src/node.rs:2:5
  |
2 | use proptest_derive::Arbitrary;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: #[warn(unused_imports)] on by default

warning: unused import: `std::u128`
   --> src/py_broadcast.rs:161:9
    |
161 |     use std::u128;
    |         ^^^^^^^^^

warning: unreachable expression
   --> src/broadcast.rs:270:9
    |
270 |         Ok(())
    |         ^^^^^^
    |
    = note: #[warn(unreachable_code)] on by default

warning: unreachable expression
   --> src/broadcast.rs:283:9
    |
283 |         self.cancel()
    |         ^^^^^^^^^^^^^

warning: method is never used: `peek`
   --> src/broadcast_queue.rs:238:5
    |
238 |     pub fn peek(&mut self) -> Option<sync::Weak<sync::RwLock<Broadcast>>> {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: #[warn(dead_code)] on by default

warning: struct is never constructed: `ChannelMap`
  --> src/channel_map.rs:18:1
   |
18 | pub struct ChannelMap {
   | ^^^^^^^^^^^^^^^^^^^^^

warning: method is never used: `add_channel`
  --> src/channel_map.rs:35:5
   |
35 | /     pub fn add_channel(
36 | |         &mut self,
37 | |         identifier: &PyChannelIdentifier,
38 | |         disc_radius: N64,
...  |
54 | |         }
55 | |     }
   | |_____^

warning: method is never used: `time`
  --> src/channel_map.rs:57:5
   |
57 |     pub fn time(&self, identifier: &PyChannelIdentifier) -> R64 {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: method is never used: `min_time`
  --> src/channel_map.rs:61:5
   |
61 |     pub fn min_time(&self) -> R64 {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: method is never used: `next_time`
  --> src/channel_map.rs:68:5
   |
68 |     pub fn next_time(&mut self, identifier: &PyChannelIdentifier) -> N64 {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: method is never used: `min_next_time`
  --> src/channel_map.rs:75:5
   |
75 |     pub fn min_next_time(&mut self) -> N64 {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: method is never used: `set_time`
  --> src/channel_map.rs:82:5
   |
82 |     pub fn set_time(&mut self, time: R64) {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: method is never used: `add_object`
   --> src/channel_map.rs:86:5
    |
86  | /     pub fn add_object(
87  | |         &mut self,
88  | |         id: HbId,
89  | |         x: R64,
...   |
105 | |         output
106 | |     }
    | |_____^

warning: method is never used: `remove_object`
   --> src/channel_map.rs:108:5
    |
108 |     pub fn remove_object(&mut self, id: HbId) -> HashMap<PyChannelIdentifier, Vec<HbId>> {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: method is never used: `set_velocity`
   --> src/channel_map.rs:123:5
    |
123 |     pub fn set_velocity(&mut self, id: HbId, dx: R64, dy: R64) {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: method is never used: `overlaps_for`
   --> src/channel_map.rs:129:5
    |
129 | /     pub fn overlaps_for(
130 | |         &mut self,
131 | |         id: HbId,
132 | |     ) -> Result<HashMap<PyChannelIdentifier, Vec<HbId>>, &'static str> {
...   |
144 | |         Ok(output)
145 | |     }
    | |_____^

warning: method is never used: `is_overlapping`
   --> src/channel_map.rs:147:5
    |
147 | /     pub fn is_overlapping(
148 | |         &mut self,
149 | |         id_1: HbId,
150 | |         id_2: HbId,
...   |
163 | |         Ok(output)
164 | |     }
    | |_____^

warning: method is never used: `next`
   --> src/channel_map.rs:166:5
    |
166 |     pub fn next(&mut self) -> Result<HashMap<PyChannelIdentifier, DiscModelEvent>, &'static str> {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: method is never used: `active_broadcast_id`
   --> src/node.rs:155:5
    |
155 |     pub fn active_broadcast_id(&self) -> Option<Uuid> {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/home/cfkaran2/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.11863sguj591joq5.rcgu.o" "/home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.11cxq1hreicjj7gu.rcgu.o" "/home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.11ic285evicmowry.rcgu.o" "/home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.13yrd4yc0p5v0ff2.rcgu.o" "/home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.1501axo31ei5uuz0.rcgu.o" "/home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.155emv662l6szgvc.rcgu.o" 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"/home/cfkaran2/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-05f9079cfd1746c1.rlib" "-Wl,-Bdynamic" "-lutil" "-lutil" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-lutil"
  = note: /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.11cxq1hreicjj7gu.rcgu.o: In function `pyo3::types::sequence::PySequence::len':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/sequence.rs:22: undefined reference to `PySequence_Size'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.13yrd4yc0p5v0ff2.rcgu.o: In function `pyo3::buffer::PyBuffer::to_vec_impl':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/buffer.rs:511: undefined reference to `PyBuffer_ToContiguous'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.155emv662l6szgvc.rcgu.o: In function `pyo3::types::iterator::PyIterator::from_object':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/iterator.rs:41: undefined reference to `PyObject_GetIter'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.1o9vb60d1li1pm4h.rcgu.o: In function `pyo3::err::PyErr::restore':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/err.rs:313: undefined reference to `PyErr_Restore'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.2nk1uqi0hjog9fgk.rcgu.o: In function `<pyo3::types::PyObjectRef as pyo3::typeob::PyTypeInfo>::type_object':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/mod.rs:120: undefined reference to `PyBaseObject_Type'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.355dmqu1k616rg57.rcgu.o: In function `pyo3::typeob::initialize_type':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/typeob.rs:431: undefined reference to `PyType_Ready'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.3c04lz9zavoxerup.rcgu.o: In function `pyo3::types::num3::<impl pyo3::conversion::IntoPyObject for u64>::into_object':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/num3.rs:83: undefined reference to `PyLong_FromUnsignedLongLong'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.3k0iysqhdjzqsxri.rcgu.o: In function `pyo3::ffi3::boolobject::Py_True':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/ffi3/boolobject.rs:24: undefined reference to `_Py_TrueStruct'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.3k0iysqhdjzqsxri.rcgu.o: In function `pyo3::ffi3::boolobject::Py_False':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/ffi3/boolobject.rs:19: undefined reference to `_Py_FalseStruct'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.3p1wqi1qpd5d9bkg.rcgu.o: In function `pyo3::ffi3::object::PyObject_TypeCheck':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/ffi3/object.rs:633: undefined reference to `PyType_IsSubtype'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.3p1wqi1qpd5d9bkg.rcgu.o: In function `pyo3::ffi3::object::Py_DECREF':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/ffi3/object.rs:807: undefined reference to `_Py_Dealloc'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.40tbvrzwfep0hb.rcgu.o: In function `pyo3::types::list::<impl pyo3::conversion::IntoPyObject for alloc::vec::Vec<T>>::into_object':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/list.rs:177: undefined reference to `PyList_New'
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/list.rs:180: undefined reference to `PyList_SetItem'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.4q5p5ts4t254n5ip.rcgu.o: In function `pyo3::typeob::PyObjectAlloc::alloc':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/typeob.rs:(.text._ZN4pyo36typeob13PyObjectAlloc5alloc17h2167861739c26820E+0x1e): undefined reference to `PyType_GenericAlloc'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.4q5p5ts4t254n5ip.rcgu.o: In function `pyo3::typeob::PyObjectAlloc::dealloc':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/typeob.rs:217: undefined reference to `PyObject_CallFinalizerFromDealloc'
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/typeob.rs:227: undefined reference to `PyObject_GC_Del'
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/typeob.rs:229: undefined reference to `PyObject_Free'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/py_disc_model-4ba71619013ee10c.j3pyrqz5km6kme7.rcgu.o: In function `pyo3::ffi3::objectabstract::PyIter_Check':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/ffi3/objectabstract.rs:(.text._ZN4pyo34ffi314objectabstract12PyIter_Check17h87fd7b6d38df1f18E+0x4a): undefined reference to `_PyObject_NextNotImplemented'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.0.rcgu.o): In function `pyo3::err::PyErr::occurred':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/err.rs:143: undefined reference to `PyErr_Occurred'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.0.rcgu.o): In function `pyo3::err::PyErr::fetch':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/err.rs:154: undefined reference to `PyErr_Fetch'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.0.rcgu.o): In function `pyo3::err::panic_after_error':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/err.rs:507: undefined reference to `PyErr_Print'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.1.rcgu.o): In function `pyo3::ffi3::object::Py_DECREF':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/ffi3/object.rs:807: undefined reference to `_Py_Dealloc'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.1.rcgu.o): In function `pyo3::ffi3::object::Py_None':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/ffi3/object.rs:845: undefined reference to `_Py_NoneStruct'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.11.rcgu.o): In function `pyo3::buffer::PyBuffer::get':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/buffer.rs:171: undefined reference to `PyObject_GetBuffer'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.11.rcgu.o): In function `pyo3::buffer::PyBuffer::release':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/buffer.rs:589: undefined reference to `PyBuffer_Release'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.11.rcgu.o): In function `<pyo3::buffer::PyBuffer as core::ops::drop::Drop>::drop':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/buffer.rs:610: undefined reference to `PyBuffer_Release'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.13.rcgu.o): In function `pyo3::types::list::PyList::len':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/list.rs:40: undefined reference to `PyList_Size'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.13.rcgu.o): In function `pyo3::types::list::PyList::get_item':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/list.rs:54: undefined reference to `PyList_GetItem'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.15.rcgu.o): In function `pyo3::pythonrun::prepare_freethreaded_python::{{closure}}':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/pythonrun.rs:39: undefined reference to `Py_IsInitialized'
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/pythonrun.rs:42: undefined reference to `PyEval_ThreadsInitialized'
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/pythonrun.rs:53: undefined reference to `Py_InitializeEx'
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/pythonrun.rs:54: undefined reference to `PyEval_InitThreads'
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/pythonrun.rs:59: undefined reference to `PyEval_SaveThread'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.15.rcgu.o): In function `<pyo3::pythonrun::GILGuard as core::ops::drop::Drop>::drop':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/pythonrun.rs:104: undefined reference to `PyGILState_Release'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.15.rcgu.o): In function `pyo3::pythonrun::GILGuard::acquire':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/pythonrun.rs:249: undefined reference to `PyGILState_Ensure'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.15.rcgu.o): In function `<pyo3::types::iterator::PyIterator<'p> as core::iter::traits::iterator::Iterator>::next':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/iterator.rs:64: undefined reference to `PyIter_Next'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.15.rcgu.o): In function `<pyo3::types::sequence::PySequence as pyo3::conversion::PyTryFrom>::try_from':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/sequence.rs:281: undefined reference to `PySequence_Check'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.4.rcgu.o): In function `pyo3::typeob::PyRawObject::new':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/typeob.rs:103: undefined reference to `PyType_GenericAlloc'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.4.rcgu.o): In function `pyo3::types::dict::PyDict::len':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/dict.rs:59: undefined reference to `PyDict_Size'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.4.rcgu.o): In function `pyo3::types::dict::PyDict::get_item::{{closure}}':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/dict.rs:90: undefined reference to `PyDict_GetItem'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.4.rcgu.o): In function `pyo3::types::dict::PyDict::items':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/dict.rs:142: undefined reference to `PyDict_Items'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.5.rcgu.o): In function `pyo3::types::exceptions::UnicodeDecodeError::new_err':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/exceptions.rs:350: undefined reference to `PyUnicodeDecodeError_Create'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.5.rcgu.o): In function `<pyo3::types::exceptions::BufferError as pyo3::typeob::PyTypeObject>::type_object':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/exceptions.rs:252: undefined reference to `PyExc_BufferError'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.5.rcgu.o): In function `<pyo3::types::exceptions::OverflowError as pyo3::typeob::PyTypeObject>::type_object':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/exceptions.rs:252: undefined reference to `PyExc_OverflowError'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.5.rcgu.o): In function `<pyo3::types::exceptions::SystemError as pyo3::typeob::PyTypeObject>::type_object':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/exceptions.rs:252: undefined reference to `PyExc_SystemError'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.5.rcgu.o): In function `<pyo3::types::exceptions::TypeError as pyo3::typeob::PyTypeObject>::type_object':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/exceptions.rs:252: undefined reference to `PyExc_TypeError'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.5.rcgu.o): In function `<pyo3::types::exceptions::ValueError as pyo3::typeob::PyTypeObject>::type_object':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/exceptions.rs:252: undefined reference to `PyExc_ValueError'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.5.rcgu.o): In function `pyo3::types::num3::<impl pyo3::conversion::IntoPyObject for u8>::into_object':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/num3.rs:42: undefined reference to `PyLong_FromLong'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.5.rcgu.o): In function `pyo3::types::num3::<impl pyo3::conversion::FromPyObject<'source> for u8>::extract':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/num3.rs:51: undefined reference to `PyNumber_Index'
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/num3.rs:55: undefined reference to `PyLong_AsLong'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.5.rcgu.o): In function `pyo3::types::num3::<impl pyo3::conversion::FromPyObject<'source> for u64>::extract':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/num3.rs:92: undefined reference to `PyNumber_Index'
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/num3.rs:96: undefined reference to `PyLong_AsUnsignedLongLong'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.5.rcgu.o): In function `pyo3::types::num3::<impl pyo3::conversion::IntoPyObject for u128>::into_object':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/num_common.rs:64: undefined reference to `_PyLong_FromByteArray'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.5.rcgu.o): In function `pyo3::types::num3::<impl pyo3::conversion::FromPyObject<'source> for u128>::extract':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/num_common.rs:77: undefined reference to `PyNumber_Index'
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/num_common.rs:82: undefined reference to `_PyLong_AsByteArray'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.9.rcgu.o): In function `pyo3::types::string::PyString::new':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/string.rs:33: undefined reference to `PyUnicode_FromStringAndSize'
          /home/cfkaran2/Documents/rust_learning/py_disc_model/target/debug/deps/libpyo3-c9684dc350cc0a40.rlib(pyo3-c9684dc350cc0a40.pyo3.b3slq90h-cgu.9.rcgu.o): In function `pyo3::types::string::PyString::as_bytes':
          /home/cfkaran2/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.6.0-alpha.2/src/types/string.rs:56: undefined reference to `PyUnicode_AsUTF8AndSize'
          collect2: error: ld returned 1 exit status
          

error: aborting due to previous error

error: Could not compile `py_disc_model`.

To learn more, run the command again with --verbose.
cfkaran2@EMANE:~/Documents/rust_learning/py_disc_model$ 

[konstin]

I think we need to differentiate these problems more.

First you're writing:

I'm having linking errors when using v0.6.0-alpha.2 which I didn't have when using v0.6.0-alpha.1.

Then you say:

I tried creating a minimal example, but the minimal example fails to compile under v0.6.0-alpha.1 with the following:

This seems contradictory to me. It should always be possible to minimize without getting a specialization error.

Then you write about the following, which looks like it's a binary compiled with the wrong module name:

And the same example compiles under v0.6.0-alpha.2, but fails to lead into python with the following

ImportError: dynamic module does not define module export function (PyInit_pyo3_bug_report)

For the final linker error, please include the output of cargo build -vvv.

[ckaran]

I created a new project, completely separate from my original code-base, in the hopes of generating a truly minimal example. I'll start over again using my original codebase and culling down to the smallest amount of code that I can. I will send you the complete output, and once I have truly minimal example that shows the problems, I'll upload everything to GitHub.

[ckaran]

@konstin I've created a repository that explains and illustrates the bug that I'm having at https://github.com/ckaran/pyo3_issue_report_341. Please let me know if I can help further with this.

[kngwyu]

@ckaran
Could you please copy&paste the output of rustc -V?

[konstin]

With the help of the repo, I could minize it to the following code:

[package]
name = "py_disc_model"
version = "0.1.0"
authors = ["Cem Karan <cem.f.karan.civ@mail.mil>"]
edition = "2018"

[dependencies]
pyo3 = {version="=0.6.0-alpha.2", features = ["extension-module"] }

[lib]
name = "py_disc_model"
crate-type = ["cdylib"]

#![feature(specialization)]

use pyo3::prelude::*;

#[pyclass]
pub struct PyChannelIdentifier {}

#[pymethods]
impl PyChannelIdentifier {
    #[new]
    pub fn __new__(_obj: &PyRawObject) -> PyResult<()> {
        unimplemented!()
    }
}

#[pymodule]
fn py_disc_model(_py: Python, m: &PyModule) -> PyResult<()> {
    m.add_class::<PyChannelIdentifier>()?;

    Ok(())
}

So it seems that "invoking" inventory seems to break cargo test. This is actually the same issue as #340 with the same workaround. I'm confused that this did work before as there have always been problems with linking and tests. How inventory is able to break the linking is not explicable to me.

[ckaran]

@konstin Thank you for the prompt response and the work-around. I have no idea how it was working before, and stopped working. I know that when I did git bisect to find the bug, at each commit after ae8a37c the number of missing symbols increased. It may be useful to look at that commit to see if it did anything special.

That said, the workaround does work for me, even on my complete project (not just the minimized project).

@kngwyu rustc -V gives rustc 1.34.0-nightly (d17318011 2019-02-07)

[konstin]

I've gathered some more information on the problem. The following code block is the trimmed down macro expansion. cargo test with the extension-module feature will lead to to linking errors, unless we either remove the #[link_section = ".ctors"] or remove the content of the __wrap method. I think that we need to somehow submit references to the wrap functions in the ctors part, but without the linker believing that we need to resolve the python c api symbols for ctors.

#![feature(specialization)]

use pyo3::prelude::*;

pub struct PyChannelIdentifier {}

impl pyo3::type_object::PyTypeInfo for PyChannelIdentifier {
    type Type = PyChannelIdentifier;
    const NAME: &'static str = "PyChannelIdentifier";
    const DESCRIPTION: &'static str = "\u{0}";
    const SIZE: usize =
        { Self::OFFSET as usize + ::std::mem::size_of::<PyChannelIdentifier>() + 0 + 0 };
    const OFFSET: isize = {
        ((<pyo3::types::PyAny as pyo3::type_object::PyTypeInfo>::SIZE
            + ::std::mem::align_of::<PyChannelIdentifier>()
            - 1)
            / ::std::mem::align_of::<PyChannelIdentifier>()
            * ::std::mem::align_of::<PyChannelIdentifier>()) as isize
    };
    const FLAGS: usize = 0;
    type BaseType = pyo3::types::PyAny;
    #[inline]
    unsafe fn type_object() -> &'static mut pyo3::ffi::PyTypeObject {
        static mut TYPE_OBJECT: pyo3::ffi::PyTypeObject = pyo3::ffi::PyTypeObject_INIT;
        &mut TYPE_OBJECT
    }
}

impl pyo3::IntoPyObject for PyChannelIdentifier {
    fn into_object(self, py: pyo3::Python) -> pyo3::PyObject {
        pyo3::Py::new(py, self).unwrap().into_object(py)
    }
}

impl pyo3::type_object::PyObjectAlloc for PyChannelIdentifier {}

pub struct PyChannelIdentifierGeneratedPyo3Inventory {
    methods: &'static [pyo3::class::PyMethodDefType],
}

impl pyo3::class::methods::PyMethodsInventory for PyChannelIdentifierGeneratedPyo3Inventory {
    fn new(methods: &'static [pyo3::class::PyMethodDefType]) -> Self {
        Self { methods }
    }
    fn get_methods(&self) -> &'static [pyo3::class::PyMethodDefType] {
        self.methods
    }
}

impl pyo3::class::methods::PyMethodsInventoryDispatch for PyChannelIdentifier {
    type InventoryType = PyChannelIdentifierGeneratedPyo3Inventory;
}

impl ::inventory::Collect for PyChannelIdentifierGeneratedPyo3Inventory {
    fn registry() -> &'static ::inventory::Registry<Self> {
        static REGISTRY: ::inventory::Registry<PyChannelIdentifierGeneratedPyo3Inventory> =
            ::inventory::Registry::new();
        &REGISTRY
    }
}

impl PyChannelIdentifier {
    pub fn foo(&self) -> PyResult<()> {
        unimplemented!()
    }
}

unsafe extern "C" fn __wrap(_slf: *mut pyo3::ffi::PyObject) -> *mut pyo3::ffi::PyObject {
    let _pool = pyo3::GILPool::new();
    let _py = pyo3::Python::assume_gil_acquired();
    let _slf = _py.mut_from_borrowed_ptr::<PyChannelIdentifier>(_slf);
    let _result = { pyo3::derive_utils::IntoPyResult::into_py_result(_slf.foo()) };
    pyo3::callback::cb_convert(pyo3::callback::PyObjectCallbackConverter, _py, _result)
}

#[used]
#[allow(non_upper_case_globals)]
#[link_section = ".ctors"]
static __init8310110886103380135: extern "C" fn() = {
    extern "C" fn __init8310110886103380135() {
        pyo3::inventory::submit({
            {
                type TyInventory = <PyChannelIdentifier as pyo3::class::methods::PyMethodsInventoryDispatch>::InventoryType;
                <TyInventory as pyo3::class::methods::PyMethodsInventory>::new(&[
                    pyo3::class::PyMethodDefType::Method({
                        pyo3::class::PyMethodDef {
                            ml_name: "foo",
                            ml_meth: pyo3::class::PyMethodType::PyNoArgsFunction(__wrap),
                            ml_flags: pyo3::ffi::METH_NOARGS,
                            ml_doc: "\u{0}",
                        }
                    }),
                ])
            }
        });
    }
    __init8310110886103380135
};

#[cfg(test)]
mod tests {
    #[test]
    fn test() {}
}

[joshtriplett]

We're running into this in the wasmtime project: bytecodealliance/wasmtime#468