ceres-solver-sys 0.2.0

Unsafe Rust bindings for the Ceres Solver
Documentation 
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fn main() {
    println!("cargo:rerun-if-changed=src/lib.h");
    println!("cargo:rerun-if-changed=src/lib.cpp");
    println!("cargo:rerun-if-changed=src/lib.rs");

    let mut cc_build = cxx_build::bridge("src/lib.rs");
    cc_build.file("src/lib.cpp");
    cc_build.flag("-std=c++17");
    #[cfg(feature = "source")]
    {
        cc_build.includes(std::env::split_paths(
            &std::env::var("DEP_CERES_INCLUDE").unwrap(),
        ));
    }
    #[cfg(not(feature = "source"))]
    {
        // Helps on Ubuntu
        #[cfg(target_os = "linux")]
        {
            cc_build.include("/usr/include/eigen3");
        }
        // Helps on x86_64 macOS with Homebrew
        #[cfg(all(target_os = "macos", target_arch = "x86_64"))]
        {
            cc_build.include("/usr/local/include/eigen3");
        }
        // Helps on aarch64 macOS with Homebrew
        #[cfg(all(target_os = "macos", target_arch = "aarch64"))]
        {
            cc_build.include("/opt/homebrew/include/eigen3");
        }
    }
    cc_build.compile("ceres-solver-sys");

    #[cfg(feature = "source")]
    {
        println!("cargo:rustc-link-lib=static=ceres");
    }
    #[cfg(not(feature = "source"))]
    {
        if let Err(pkg_config_error) = pkg_config::Config::new()
            // the earliest version tested, it may work with elder versions
            .range_version("2.0.0".."3.0.0")
            .probe("ceres")
        {
            dbg!(pkg_config_error);
            println!("cargo:rustc-link-lib=ceres");
        }
    }
}