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Use fallback sysroot directory if we cannot find libgccjit.so in the explicit directory #811

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Merged
antoyo merged 1 commit into from
Nov 30, 2025
Merged

Use fallback sysroot directory if we cannot find libgccjit.so in the explicit directory #811

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20 changes: 17 additions & 3 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,7 @@ mod type_of;
use std::any::Any;
use std::ffi::CString;
use std::fmt::Debug;
use std::fs;
use std::ops::Deref;
use std::path::{Path, PathBuf};
use std::sync::atomic::{AtomicBool, Ordering};
Expand Down Expand Up @@ -180,14 +181,18 @@ pub struct GccCodegenBackend {

static LTO_SUPPORTED: AtomicBool = AtomicBool::new(false);

fn libgccjit_path(sysroot_path: &Path) -> PathBuf {
let sysroot_lib_dir = sysroot_path.join("lib");
sysroot_lib_dir.join("libgccjit.so")
}

fn load_libgccjit_if_needed(sysroot_path: &Path) {
if gccjit::is_loaded() {
// Do not load a libgccjit second time.
return;
}

let sysroot_lib_dir = sysroot_path.join("lib");
let libgccjit_target_lib_file = sysroot_lib_dir.join("libgccjit.so");
let libgccjit_target_lib_file = libgccjit_path(sysroot_path);
let path = libgccjit_target_lib_file.to_str().expect("libgccjit path");

let string = CString::new(path).expect("string to libgccjit path");
Expand All @@ -207,7 +212,16 @@ impl CodegenBackend for GccCodegenBackend {
}

fn init(&self, sess: &Session) {
load_libgccjit_if_needed(sess.opts.sysroot.path());
// We use all_paths() instead of only path() in case the path specified by --sysroot is
// invalid.
// This is the case for instance in Rust for Linux where they specify --sysroot=/dev/null.
for path in sess.opts.sysroot.all_paths() {
let libgccjit_target_lib_file = libgccjit_path(path);
if let Ok(true) = fs::exists(libgccjit_target_lib_file) {
load_libgccjit_if_needed(path);
break;
}
}

#[cfg(feature = "master")]
{
Expand Down