cannot find function ... in module $crate::sys

[yuyidegit]

1. Operating system:windows 11 23H2
2. The way you installed OpenCV: vcpkg install llvm:x64-windows opencv4[contrib,nonfree]:x64-windows
3. OpenCV version: 4.7.0
4. rustc version:1.71.0
5. Attach the full output of the following command from your project directory:

   RUST_BACKTRACE=full cargo build -vv 

build.log

[twistedfall]

Can you please try using version 0.83 of the crate to see if it fixes your build issue?

[yuyidegit]

I have tried 0.83 and set VCPKGRS_DYNAMIC to "1",but get a lot of link error
build2.log

[leng-yue]

Can you please try using version 0.83 of the crate to see if it fixes your build issue?

I met the same issue, and rolling back to 0.83 solved it.

[twistedfall]

@leng-yue @yuyidegit Did you by any chance try running cargo clean before building with 0.84 to see if it solves the issue?

[leng-yue]

@twistedfall After cleaning, the 0.84.4 works now.
Update: this bug is not solved, and it seems the error only occurs in the release build.

[twistedfall]

Thanks for checking, I'm investigating!

[yuyidegit]

After cleaning, use 0.84.4 and set VCPKGRS_DYNAMIC to "1",get a lot of link error just like use 0.83,but in wsl it works @twistedfall .

[foxzool]

I have same error with windows 11, vcpkg opencv 4.8, VCPKGRS_DYNAMIC = 1
It's only work on 0.84.3
0.84.3-work.txt
0.84.5-master-not-work.txt
0.84.4-not-work.txt

[chriskyndrid]

+1, I run into this regularly on x64 Linux, specifically Fedora 37. I'm running the latest bindings:

694 |             unsafe { sys::std_vectorLintG_inputOutputArray(self.as_raw_mut_VectorOfi32(), ocvrs_return.as_mut_ptr()) };
     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: a function with a similar name exists: `std_vectorLfloatG_inputOutputArray`

Interestingly when I do cargo clean, 2-5 times, I'll eventually get a successful compilation. I don't really understand why a compilation will eventually work, subject to (n) number of cargo clean's and recompilation attempts.

I did not encounter this issue until I recently did a cargo update and ran into #480. Pinning to version:

[dependencies.opencv]
version = "0.84.5" #correct cc version --- see https://github.com/twistedfall/opencv-rust/issues/480 for upgrading
features = ["clang-runtime", "photo", "imgcodecs", "imgproc"]

Resolved the hang issue, but not this. I speculated perhaps the build process wasn't complete when the rust compiler proceeds resulting in those missing functions.

opencv version is 4.6(stock with Fedora 37)

[twistedfall]

@chriskyndrid I have tried reproducing this issue in a fresh Fedora 37 docker container. I installed git, clang, opencv and opencv-devel into it. And I installed rust using rustup. In a new cargo project with the following Cargo.toml:

[package]
name = "opencv-test"
version = "0.1.0"
edition = "2021"

[dependencies]
opencv = { version = "0.84.5", features = ["clang-runtime", "photo", "imgcodecs", "imgproc"]}

and main.rs:

use opencv::core;
use opencv::prelude::*;
use opencv::types::*;

fn main() {
    println!("Hello, world!");
    println!("{}", core::get_build_information().unwrap());
    let v = VectorOfi32::new();
    dbg!(v);
}

I have tried numerous (about 10) times to trigger this issue in both debug and release mode by running cargo clean; cargo run -vv and I haven't encountered an issue in any of the tries.

Will it possible for you to share the full build log cargo build -vv for both failed and successful build?

[chriskyndrid]

@twistedfall thanks for getting back to me and your work on this crate.

I will see what I can do. The project is quite large(it's a full fledged ERP system WIP with a lot of dependencies, ancillary functionality, etc). It's also made slightly more difficult as the problem is transient. As an example I just did a non -vv run build and was greeted with:

error[E0425]: cannot find function `std_vectorLintG_outputArray` in module `sys`
     |
3681 |             unsafe { sys::std_vectorLintG_outputArray(self.as_raw_mut_VectorOfi32(), ocvrs_return.as_mut_ptr()) };
     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: a function with a similar name exists: `std_vectorLfloatG_outputArray`
     |
     |
3505 |         pub fn std_vectorLfloatG_outputArray(instance: *mut c_void, ocvrs_return: *mut Result<*mut c_void>);
     |         ---------------------------------------------------------------------------------------------------- similarly named function `std_vectorLfloatG_outputArray` defined here

error[E0425]: cannot find function `std_vectorLintG_inputOutputArray` in module `sys`
     |
3694 |             unsafe { sys::std_vectorLintG_inputOutputArray(self.as_raw_mut_VectorOfi32(), ocvrs_return.as_mut_ptr()) };
     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: a function with a similar name exists: `std_vectorLfloatG_inputOutputArray`
     |3
     |
3506 |         pub fn std_vectorLfloatG_inputOutputArray(instance: *mut c_void, ocvrs_return: *mut Result<*mut c_void>);
     |         --------------------------------------------------------------------------------------------------------- similarly named function `std_vectorLfloatG_inputOutputArray` defined here

etc....

Of course adjusting my run script to include -vv, and built fine. I'll keep running cargo clean && cargo run -vv and see if I can get a good capture.

[twistedfall]

This issue should now be fixed in 0.85.3