Issue with cargo tarpaulin

I am using cargo tarpaulin to generate code coverage. While everything compiles smoothly in tests and release mode, using tarpaulin results in a lot of errors.

I have replicated this in a fresh Ubuntu:22.04 docker container. With

rustc --version: rustc 1.71.1 (eb26296b5 2023-08-03)
opencv 4.7.0, opencv 4.8.0 (also each debug build mode)
opencv-rust version 0.70 up to the most recent one

This is the error output from cargo tarpaulin:

error.log

You can use this Dockerfile to recreate the error with a minimal example that only includes the opencv dependency, and does nothing else besides that.

# Use Ubuntu 22.04 as the base image
FROM ubuntu:22.04

ENV DEBIAN_FRONTEND=noninteractive
ENV OPENCV_VERSION=4.8.0

# Install necessary dependencies, OpenCV, and its development packages
RUN apt-get update && apt-get install -y \
    clang \
    libclang-dev \
    pkg-config \
    curl \
    build-essential \
    openssl \
    libssl-dev \
    cmake g++ wget unzip

# install opencv from scratch
WORKDIR /tmp

# Download opencv and opencv_contrib
RUN wget -O opencv.zip https://github.com/opencv/opencv/archive/refs/tags/${OPENCV_VERSION}.zip && \
    wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/refs/tags/${OPENCV_VERSION}.zip

# Unzip
RUN unzip opencv.zip && \
    unzip opencv_contrib.zip

WORKDIR /tmp/opencv-${OPENCV_VERSION}/build

# Configure the build
#RUN cmake -D CMAKE_BUILD_TYPE=RELEASE \
RUN cmake -D CMAKE_BUILD_TYPE=DEBUG \
          -D CMAKE_INSTALL_PREFIX=/usr/local \
          -D INSTALL_C_EXAMPLES=OFF \
          -D INSTALL_PYTHON_EXAMPLES=OFF \
          -D OPENCV_EXTRA_MODULES_PATH=/tmp/opencv_contrib-${OPENCV_VERSION}/modules \
          -D BUILD_EXAMPLES=OFF ..

# Build and install
RUN make -j$(nproc) && \
    make install && \
    ldconfig

# Set environment variables for dynamic linking and pkg-config path
ENV LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu:/usr/local/lib
ENV PKG_CONFIG_PATH=/usr/lib/x86_64-linux-gnu/pkgconfig:/usr/local/lib/pkgconfig

# Install Rust using rustup
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain stable -y
ENV PATH="/root/.cargo/bin:${PATH}"

# Create a new Rust project
WORKDIR /app
RUN cargo new rust_opencv_project

# Change working directory to the new Rust project
WORKDIR /app/rust_opencv_project

# Add OpenCV dependency to the Cargo.toml
RUN echo 'opencv = "0.83"' >> Cargo.toml

# Patch the Cargo.toml file
RUN echo "\n[patch.crates-io]" >> Cargo.toml && \
    echo "cc = { git = \"https://github.com/rust-lang/cc-rs.git\", version = \"1.0\", tag = \"1.0.79\" }" >> Cargo.toml

# Add use statement in src/main.rs
RUN sed -i '1i\use opencv::prelude::*;\n' src/main.rs

# Build the project to ensure it compiles successfully
RUN cargo build

# Install cargo-tarpaulin for code coverage
RUN cargo install cargo-tarpaulin

# Run cargo tarpaulin to generate code coverage
# I simply run the container and attach with bash, and run cargo tarpaulin myself, since
# this command will fail
#RUN cargo tarpaulin

twistedfall / opencv-rust

Issue with cargo tarpaulin #491