XMake and Rust Cargo: error[E0464]: multiple candidates for rlib dependency crossbeam_channel found

[jfulem]

I have a project which uses Cargo.toml and it builds and runs OK when I build it as:
cargo build --release

I want to build it by xmake since we build other c++ packages by xmake.

So this is my xmake.lua:

add_rules("mode.release", "mode.debug")
add_requires("cargo::oscope", {configs = {cargo_toml = path.join(os.projectdir(), "Cargo.toml")}})

target("oscilloscope")
    set_kind("binary")
    set_values("rust.edition", "2021")
    add_files("src/main.rs")
    add_packages("cargo::oscope")

The Cargo.toml looks like this:

[package]
name = "oscw"
description = "TestWindow"
version = "0.1.0"
edition = "2021"

[dependencies]
anyhow = "1.0.86"
eframe = "0.29.1"
egui = "0.29.1"
flatbuffers = "24.3.25"
image = "0.25.1"
libloading = "0.8.4"
lazy_static = "1.5.0"
crossbeam-channel = "0.5.13"
tracing = "0.1.40"
tracing-subscriber = "0.3.18"
tracing-appender = "0.2.3"
tracing-error = "0.2.0"
circular-buffer = "0.1.7"
imageproc = "0.25.0"
zmq = "0.10.0"
sqlite = "0.36.1"
chrono = "0.4.38"
regex = "1.11.0"
egui-notify = "0.16.0"


[lints.clippy]
unwrap_used = "warn"

When I run xmake build it creates all packages in \build\.packages\c\cargo_oscope\latest\d4c040d256014d9ea8104c701aa61f7e\lib\

but then it fails in linking.release (rustc -C opt-level=3 --edition 2021 -L dependency ...)

error: error[E0464]: multiple candidates for `rlib` dependency `crossbeam_channel` found
 --> src\comm\zero.rs:9:5
  |
9 | use crossbeam_channel::Sender;
  |     ^^^^^^^^^^^^^^^^^
  |
  = note: candidate #1: \\?.\build\.packages\c\cargo_oscope\latest\d4c040d256014d9ea8104c701aa61f7e\lib\libcrossbeam_channel-661e98f10129356f.rlib
  = note: candidate #2: \\?\.\build\.packages\c\cargo_oscope\latest\d4c040d256014d9ea8104c701aa61f7e\lib\libcrossbeam_channel-878f8be69da6794f.rlib

Please, can you help me with this? Is using Cargo.toml the issue?

[waruqi]

please provide a whole project example as zip attachment

[jfulem]

just run: cargo build --release

[jfulem]

When I run it via xmake:

root@dfb3c7082e9e:/TestApp/target/release# ls
TestApp  TestApp.d  build  deps  examples  incremental
root@dfb3c7082e9e:/TestApp/target/release# cd ../..
root@dfb3c7082e9e:/TestApp# rustc --version
rustc 1.79.0 (129f3b996 2024-06-10)
root@dfb3c7082e9e:/TestApp# cargo --version
cargo 1.79.0 (ffa9cf99a 2024-06-03)
root@dfb3c7082e9e:/TestApp# nano xmake.lua
root@dfb3c7082e9e:/TestApp# xmake build
checking for platform ... linux
checking for architecture ... x86_64
updating repositories .. ok
note: install or modify (m) these packages (pass -y to skip confirm)?
in cargo:
  -> cargo::osco latest [cargo_toml:"/TestApp/Cargo.toml"]
please input: y (y/n/m)
y
  => install cargo::osco latest .. ok
[ 66%]: linking.release testview
error: error[E0464]: multiple candidates for `rlib` dependency `crossbeam_channel` found
 --> src/main.rs:1:5
  |
1 | use crossbeam_channel::{bounded, Receiver, Sender};
  |     ^^^^^^^^^^^^^^^^^
  |
  = note: candidate #1: /TestApp/build/.packages/c/cargo_osco/latest/ae658297b0e7409b8f47fcd6635303e3/lib/libcrossbeam_channel-3d29bf578a885c1c.rlib
  = note: candidate #2: /TestApp/build/.packages/c/cargo_osco/latest/ae658297b0e7409b8f47fcd6635303e3/lib/libcrossbeam_channel-6fc6c459a2a66425.rlib

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0464`.

warning: the arch "x86_64" is NOT a valid target triple, will be IGNORED and may cause compilation errors, please check it again
warning: add -v for getting more warnings ..

[waruqi]

egui/eframe/zmq also pulls in libcrossbeam_channel dependencies, resulting in two different libcrossbeam_channel s. Although I can do deduplication, I don't know which one to use.

Which one does cargo build use?

  frameworks = { 
    "/tmp/TestApp/build/.packages/c/cargo_osco/latest/2fcf08f91ae342fe8227d9bd59ff55ec/lib/libuuid-4d694bb5fde57583.rlib",
    "/tmp/TestApp/build/.packages/c/cargo_osco/latest/2fcf08f91ae342fe8227d9bd59ff55ec/lib/libegui-bc0e76e3a1783e6a.rlib",
    "/tmp/TestApp/build/.packages/c/cargo_osco/latest/2fcf08f91ae342fe8227d9bd59ff55ec/lib/libcrossbeam_channel-a08e766a4caa49c8.rlib",
    "/tmp/TestApp/build/.packages/c/cargo_osco/latest/2fcf08f91ae342fe8227d9bd59ff55ec/lib/libcrossbeam_channel-4965668fc61a4a90.rlib",
    "/tmp/TestApp/build/.packages/c/cargo_osco/latest/2fcf08f91ae342fe8227d9bd59ff55ec/lib/libzmq-b64c7b8a8eae756c.rlib",
    "/tmp/TestApp/build/.packages/c/cargo_osco/latest/2fcf08f91ae342fe8227d9bd59ff55ec/lib/libeframe-c7dba3963e5aa13b.rlib" 
  }

[jfulem]

Good question, but I don't know. There are 2 libcrossbeam_channel libraries identified, but effectively they are the same version and that's the key. One dep is from zmq and one is directly from Cargo.toml. So I would say in this case it does not matter.

[waruqi]

I don't know how I don't know how to choose it better. I can only simply remove duplicates. But at least it should be able to solve the current problem.

you can try again. xmake update -s dev

ruki@6ab70400e659:/tmp/TestApp$ xmake -rv
checking for rustc ... /home/ruki/.cargo/bin/rustc
checking for the rust compiler (rc) ... rustc
checking for /home/ruki/.cargo/bin/rustc ... ok
checking for flags (-C opt-level=3) ... ok
[ 66%]: linking.release testview
checking for rustc ... /home/ruki/.cargo/bin/rustc
checking for the rust linker (rcld) ... rustc
/home/ruki/.cargo/bin/rustc -C opt-level=3 --edition 2018 -L dependency=/tmp/TestApp/build/.packages/c/cargo_osco/latest/2fcf08f91ae342fe8227d9bd59ff55ec/lib --extern uuid=/tmp/TestApp/build/.packages/c/cargo_osco/latest/2fcf08f91ae342fe8227d9bd59ff55ec/lib/libuuid-4d694bb5fde57583.rlib --extern egui=/tmp/TestApp/build/.packages/c/cargo_osco/latest/2fcf08f91ae342fe8227d9bd59ff55ec/lib/libegui-bc0e76e3a1783e6a.rlib --extern crossbeam_channel=/tmp/TestApp/build/.packages/c/cargo_osco/latest/2fcf08f91ae342fe8227d9bd59ff55ec/lib/libcrossbeam_channel-a08e766a4caa49c8.rlib --extern zmq=/tmp/TestApp/build/.packages/c/cargo_osco/latest/2fcf08f91ae342fe8227d9bd59ff55ec/lib/libzmq-b64c7b8a8eae756c.rlib --extern eframe=/tmp/TestApp/build/.packages/c/cargo_osco/latest/2fcf08f91ae342fe8227d9bd59ff55ec/lib/libeframe-c7dba3963e5aa13b.rlib --crate-type=bin -o build/linux/x86_64/release/testview src/main.rs
[100%]: build ok, spent 11.69s

[jfulem]

I got two issues:

1. The TestApp cannot be compiled on windows due to this error: note: LINK : fatal error LNK1181: cannot open input file 'windows.0.52.0.lib'
2. In my real app I added a build.rs in Cargo.toml but it fails with: error: couldn't read build.rs: The system cannot find the file specified. (os error 2)

[waruqi]

We use Cargo.toml just to pull in dependencies, I don't know why you added build.rs .

xmake will create an empty rust project with Cargot.toml to parse libs.

xmake/xmake/modules/package/manager/cargo/install_package.lua

Line 89 in 796a3b9

os.cp(configs.cargo_toml, cargotoml)

so it's root directory is not project root directory. we cannot access build.rs file.

[jfulem]

OK, understood. I used vergen due to version and build date. I can change that and not to use build.rs

And the issue with windows.lib?

[waruqi]

This seems to be an old issue, but I don't know how to fix it yet.

We need to pass the windows libs path to rustc, but I don't know how to get it.

#4216

[jfulem]

This is unfortunate. It looks like I can't use xmake to build our rust project. I use it to build complex C++ projects with dependencies such as depthai-core, google mediapipe and opencv. It would be very nice to use one build system for all.