ceres-solver-sys 0.2.1

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(),
        ));
        println!("cargo:rustc-link-lib=static=glog");
        println!("cargo:rustc-link-lib=static=ceres");
    }
    #[cfg(not(feature = "source"))]
    {
        if let Ok(library) = pkg_config::Config::new()
            .range_version("3.3.4".."4.0.0")
            .probe("eigen3")
        {
            library.include_paths.into_iter().for_each(|path| {
                cc_build.include(path);
            });
        }
        match pkg_config::Config::new()
            .range_version("2.0.0".."3.0.0")
            .probe("ceres")
        {
            Ok(library) => library.include_paths.into_iter().for_each(|path| {
                cc_build.include(path);
            }),
            Err(_) => println!("cargo:rustc-link-lib=ceres"),
        }
    }
    cc_build.compile("ceres-solver-sys");
}