| use std::env; |
| use std::path::{Path, PathBuf}; |
| use std::process::Command; |
| |
| fn main() { |
| let manifest_dir_opt = env::var_os("CARGO_MANIFEST_DIR").map(PathBuf::from); |
| let manifest_dir = manifest_dir_opt.as_deref().unwrap_or(Path::new("")); |
| |
| cc::Build::new() |
| .file(manifest_dir.join("src/cxx.cc")) |
| .cpp(true) |
| .cpp_link_stdlib(None) // linked via link-cplusplus crate |
| .std(cxxbridge_flags::STD) |
| .warnings_into_errors(cfg!(deny_warnings)) |
| .compile("cxxbridge1"); |
| |
| println!("cargo:rerun-if-changed=src/cxx.cc"); |
| println!("cargo:rerun-if-changed=include/cxx.h"); |
| println!("cargo:rustc-cfg=built_with_cargo"); |
| |
| if let Some(manifest_dir) = &manifest_dir_opt { |
| let cxx_h = manifest_dir.join("include").join("cxx.h"); |
| println!("cargo:HEADER={}", cxx_h.to_string_lossy()); |
| } |
| |
| if let Some(rustc) = rustc_version() { |
| if rustc.minor < 60 { |
| println!("cargo:warning=The cxx crate requires a rustc version 1.60.0 or newer."); |
| println!( |
| "cargo:warning=You appear to be building with: {}", |
| rustc.version, |
| ); |
| } |
| } |
| } |
| |
| struct RustVersion { |
| version: String, |
| minor: u32, |
| } |
| |
| fn rustc_version() -> Option<RustVersion> { |
| let rustc = env::var_os("RUSTC")?; |
| let output = Command::new(rustc).arg("--version").output().ok()?; |
| let version = String::from_utf8(output.stdout).ok()?; |
| let mut pieces = version.split('.'); |
| if pieces.next() != Some("rustc 1") { |
| return None; |
| } |
| let minor = pieces.next()?.parse().ok()?; |
| Some(RustVersion { version, minor }) |
| } |