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use std::path::PathBuf;
use anyhow::*;
use cargo::core::Workspace;
#[derive(Debug)]
pub struct Target {
pub arch: String,
pub os: String,
pub env: String,
pub verbatim: Option<std::ffi::OsString>,
}
impl Target {
pub fn new<T: AsRef<std::ffi::OsStr>>(target: Option<T>) -> Result<Self, anyhow::Error> {
let rustc = std::env::var("RUSTC").unwrap_or_else(|_| "rustc".into());
let mut cmd = std::process::Command::new(rustc);
cmd.arg("--print").arg("cfg");
if let Some(t) = target.as_ref() {
cmd.arg("--target").arg(t);
}
let out = cmd.output()?;
if out.status.success() {
fn match_re(re: regex::Regex, s: &str) -> String {
re.captures(s)
.map_or("", |cap| cap.get(1).unwrap().as_str())
.to_owned()
}
let arch_re = regex::Regex::new(r#"target_arch="(.+)""#).unwrap();
let os_re = regex::Regex::new(r#"target_os="(.+)""#).unwrap();
let env_re = regex::Regex::new(r#"target_env="(.+)""#).unwrap();
let s = std::str::from_utf8(&out.stdout).unwrap();
Ok(Target {
arch: match_re(arch_re, s),
os: match_re(os_re, s),
env: match_re(env_re, s),
verbatim: target.map(|v| v.as_ref().to_os_string()),
})
} else {
Err(anyhow!("Cannot run {:?}", cmd))
}
}
pub fn shared_object_link_args(
&self,
name: &str,
ws: &Workspace,
libdir: &PathBuf,
target_dir: &PathBuf,
) -> Vec<String> {
let mut lines = Vec::new();
let pkg = ws.current().unwrap();
let version = pkg.version();
let major = version.major;
let minor = version.minor;
let patch = version.patch;
let os = &self.os;
let env = &self.env;
if os == "linux" || os == "freebsd" || os == "dragonfly" || os == "netbsd" {
lines.push(format!("-Wl,-soname,lib{}.so.{}", name, major));
} else if os == "macos" {
let line = format!("-Wl,-install_name,{1}/lib{0}.{2}.{3}.{4}.dylib,-current_version,{2}.{3}.{4},-compatibility_version,{2}",
name, libdir.display(), major, minor, patch);
lines.push(line)
} else if os == "windows" && env == "gnu" {
lines.push(format!(
"-Wl,--output-def,{}",
target_dir.join(format!("{}.def", name)).display()
));
}
lines
}
}