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use pathdiff::diff_paths;
use rustc_data_structures::fx::FxHashSet;
use std::env;
use std::fs;
use std::path::{Path, PathBuf};
pub struct RPathConfig<'a> {
pub libs: &'a [&'a Path],
pub out_filename: PathBuf,
pub is_like_osx: bool,
pub has_rpath: bool,
pub linker_is_gnu: bool,
}
pub fn get_rpath_flags(config: &mut RPathConfig<'_>) -> Vec<String> {
// No rpath on windows
if !config.has_rpath {
return Vec::new();
}
debug!("preparing the RPATH!");
let rpaths = get_rpaths(config);
let mut flags = rpaths_to_flags(&rpaths);
if config.linker_is_gnu {
// Use DT_RUNPATH instead of DT_RPATH if available
flags.push("-Wl,--enable-new-dtags".to_owned());
// Set DF_ORIGIN for substitute $ORIGIN
flags.push("-Wl,-z,origin".to_owned());
}
flags
}
fn rpaths_to_flags(rpaths: &[String]) -> Vec<String> {
let mut ret = Vec::with_capacity(rpaths.len()); // the minimum needed capacity
for rpath in rpaths {
if rpath.contains(',') {
ret.push("-Wl,-rpath".into());
ret.push("-Xlinker".into());
ret.push(rpath.clone());
} else {
ret.push(format!("-Wl,-rpath,{}", &(*rpath)));
}
}
ret
}
fn get_rpaths(config: &mut RPathConfig<'_>) -> Vec<String> {
debug!("output: {:?}", config.out_filename.display());
debug!("libs:");
for libpath in config.libs {
debug!(" {:?}", libpath.display());
}
// Use relative paths to the libraries. Binaries can be moved
// as long as they maintain the relative relationship to the
// crates they depend on.
let rpaths = get_rpaths_relative_to_output(config);
debug!("rpaths:");
for rpath in &rpaths {
debug!(" {}", rpath);
}
// Remove duplicates
minimize_rpaths(&rpaths)
}
fn get_rpaths_relative_to_output(config: &mut RPathConfig<'_>) -> Vec<String> {
config.libs.iter().map(|a| get_rpath_relative_to_output(config, a)).collect()
}
fn get_rpath_relative_to_output(config: &mut RPathConfig<'_>, lib: &Path) -> String {
// Mac doesn't appear to support $ORIGIN
let prefix = if config.is_like_osx { "@loader_path" } else { "$ORIGIN" };
let cwd = env::current_dir().unwrap();
let mut lib = fs::canonicalize(&cwd.join(lib)).unwrap_or_else(|_| cwd.join(lib));
lib.pop(); // strip filename
let mut output = cwd.join(&config.out_filename);
output.pop(); // strip filename
let output = fs::canonicalize(&output).unwrap_or(output);
let relative = path_relative_from(&lib, &output)
.unwrap_or_else(|| panic!("couldn't create relative path from {:?} to {:?}", output, lib));
// FIXME (#9639): This needs to handle non-utf8 paths
format!("{}/{}", prefix, relative.to_str().expect("non-utf8 component in path"))
}
// This routine is adapted from the *old* Path's `path_relative_from`
// function, which works differently from the new `relative_from` function.
// In particular, this handles the case on unix where both paths are
// absolute but with only the root as the common directory.
fn path_relative_from(path: &Path, base: &Path) -> Option<PathBuf> {
diff_paths(path, base)
}
fn minimize_rpaths(rpaths: &[String]) -> Vec<String> {
let mut set = FxHashSet::default();
let mut minimized = Vec::new();
for rpath in rpaths {
if set.insert(rpath) {
minimized.push(rpath.clone());
}
}
minimized
}
#[cfg(all(unix, test))]
mod tests;
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