build.rs

extern crate cbindgen;

use std::env;

fn main() {
    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();

    cbindgen::Builder::new()
        .with_crate(crate_dir)
        .with_namespace("cbindgen_test")
        .with_language(cbindgen::Language::Cxx)
        .generate()
        .expect("Unable to generate bindings")
        .write_to_file("cbindgen_test.h");
}

Cargo.toml

[package]
name = "cbindgen_test"
version = "0.2.0"
authors = ["Geordon Worley <vadixidav@gmail.com>"]

[lib]
crate-type = ["staticlib"]

[profile]
panic = "abort"

[dependencies]

[build-dependencies]
cbindgen = "0.6.0"

conanfile.py

from conans import ConanFile, CMake, tools


class CbindgentestConan(ConanFile):
    name = "cbindgen_test"
    version = "0.2.0"
    description = "Test generated C++ bindings for Rust"
    settings = "os", "compiler", "build_type", "arch"
    no_copy_source = True

    def cargo_target(self):
        return "i686-pc-windows-msvc" if self.settings.arch == "x86" else "x86_64-pc-windows-msvc"

    def source(self):
        self.run(
            "git clone git@github.com:vadixidav/cbindgen_test.git . || git fetch")
        self.run("git checkout v{}".format(self.version))

    def build(self):
        flags = "-C target-feature={}crt-static".format(
            "+" if self.settings.compiler.runtime in ["MT", "MTd"] else "-")
        with tools.environment_append({"CARGO_TARGET_DIR": self.build_folder, "RUSTFLAGS": flags}):
            with tools.chdir(self.source_folder):
                debrel = "--release" if self.settings.build_type == "Release" else ""
                self.run(
                    "cargo build {} --target={}".format(debrel, self.cargo_target()))

    def package(self):
        mode = "debug" if self.settings.build_type == "Debug" else "release"
        out_dir = "{}/{}".format(self.cargo_target(), mode)
        self.copy("cbindgen_test.h", dst="include")
        self.copy("cbindgen_test.dll", dst="bin", src=out_dir, keep_path=False)
        self.copy("cbindgen_test.lib", dst="lib", src=out_dir, keep_path=False)
        self.copy("cbindgen_test.so", dst="lib", src=out_dir, keep_path=False)
        self.copy("cbindgen_test.dylib", dst="lib",
                  src=out_dir, keep_path=False)
        self.copy("cbindgen_test.a", dst="lib", src=out_dir, keep_path=False)

    def package_info(self):
        self.cpp_info.libs = tools.collect_libs(self)
        self.cpp_info.libs += ["Ws2_32", "Userenv"]

lib.rs

#[no_mangle]
pub extern "C" fn hello(a: i32) {
    println!("Hello, {}!", a);
}