Move libgccjit.so in the sysroot

This will be useful for the unification work of the handling of the
library between all Rust setups.

.github/workflows/failures.yml

@@ -54,8 +54,6 @@ jobs:
       if: matrix.libgccjit_version.gcc == 'libgccjit12.so'
       run: |
           echo 'gcc-path = "/usr/lib/gcc/x86_64-linux-gnu/12"' > config.toml
-          echo "LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/12" >> $GITHUB_ENV
-          echo "LD_LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/12" >> $GITHUB_ENV
 
     - name: Download artifact
       if: matrix.libgccjit_version.gcc != 'libgccjit12.so'

.github/workflows/gcc12.yml

@@ -51,12 +51,6 @@ jobs:
     - name: Setup path to libgccjit
       run: echo 'gcc-path = "/usr/lib/gcc/x86_64-linux-gnu/12"' > config.toml
 
-    - name: Set env
-      run: |
-        echo "workspace="$GITHUB_WORKSPACE >> $GITHUB_ENV
-        echo "LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/12" >> $GITHUB_ENV
-        echo "LD_LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/12" >> $GITHUB_ENV
-
     #- name: Cache rust repository
       ## We only clone the rust repository for rustc tests
       #if: ${{ contains(matrix.commands, 'rustc') }}

.github/workflows/stdarch.yml

@@ -59,9 +59,8 @@ jobs:
           sudo ln -s /usr/share/intel-sde/sde /usr/bin/sde
           sudo ln -s /usr/share/intel-sde/sde64 /usr/bin/sde64
 
-    - name: Set env
+    - name: Set config
       run: |
-        echo "workspace="$GITHUB_WORKSPACE >> $GITHUB_ENV
         echo 'download-gccjit = true' > config.toml
 
     - name: Build
@@ -69,12 +68,6 @@ jobs:
         ./y.sh prepare --only-libcore
         ./y.sh build --sysroot --release --release-sysroot
 
-    - name: Set env (part 2)
-      run: |
-        # Set the `LD_LIBRARY_PATH` and `LIBRARY_PATH` env variables...
-        echo "LD_LIBRARY_PATH="$(./y.sh info | grep -v Using) >> $GITHUB_ENV
-        echo "LIBRARY_PATH="$(./y.sh info | grep -v Using) >> $GITHUB_ENV
-
     - name: Clean
       if: ${{ !matrix.cargo_runner }}
       run: |

build_system/src/build.rs

@@ -1,7 +1,8 @@
 use std::collections::HashMap;
 use std::ffi::OsStr;
 use std::fs;
-use std::path::Path;
+use std::os::unix::fs::symlink;
+use std::path::{Path, PathBuf};
 
 use crate::config::{Channel, ConfigInfo};
 use crate::utils::{
@@ -100,6 +101,18 @@ fn cleanup_sysroot_previous_build(library_dir: &Path) {
 pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Result<(), String> {
     let start_dir = get_sysroot_dir();
 
+    // Symlink libgccjit.so to sysroot.
+    let lib_path = start_dir.join("sysroot").join("lib");
+    let libgccjit_path =
+        PathBuf::from(config.gcc_path.as_ref().expect("libgccjit should be set by this point"))
+            .join("libgccjit.so");
+    let libgccjit_in_sysroot_path = lib_path.join("libgccjit.so");
+    // First remove the file to be able to create the symlink even when the file already exists.
+    let _ = fs::remove_file(&libgccjit_in_sysroot_path);
+    create_dir(&lib_path)?;
+    symlink(libgccjit_path, libgccjit_in_sysroot_path)
+        .map_err(|error| format!("Cannot create symlink for libgccjit.so: {}", error))?;
+
     let library_dir = start_dir.join("sysroot_src").join("library");
     cleanup_sysroot_previous_build(&library_dir);
 
@@ -148,7 +161,7 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
     run_command_with_output_and_env(&args, Some(&sysroot_dir), Some(&env))?;
 
     // Copy files to sysroot
-    let sysroot_path = start_dir.join(format!("sysroot/lib/rustlib/{}/lib/", config.target_triple));
+    let sysroot_path = lib_path.join(format!("rustlib/{}/lib/", config.target_triple));
     // To avoid errors like "multiple candidates for `rmeta` dependency `core` found", we clean the
     // sysroot directory before copying the sysroot build artifacts.
     let _ = fs::remove_dir_all(&sysroot_path);
@@ -175,13 +188,6 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
 fn build_codegen(args: &mut BuildArg) -> Result<(), String> {
     let mut env = HashMap::new();
 
-    let gcc_path =
-        args.config_info.gcc_path.clone().expect(
-            "The config module should have emitted an error if the GCC path wasn't provided",
-        );
-    env.insert("LD_LIBRARY_PATH".to_string(), gcc_path.clone());
-    env.insert("LIBRARY_PATH".to_string(), gcc_path);
-
     if args.config_info.no_default_features {
         env.insert("RUSTFLAGS".to_string(), "-Csymbol-mangling-version=v0".to_string());
     }

build_system/src/config.rs

@@ -429,19 +429,6 @@ impl ConfigInfo {
         // display metadata load errors
         env.insert("RUSTC_LOG".to_string(), "warn".to_string());
 
-        let sysroot = current_dir
-            .join(get_sysroot_dir())
-            .join(format!("sysroot/lib/rustlib/{}/lib", self.target_triple));
-        let ld_library_path = format!(
-            "{target}:{sysroot}:{gcc_path}",
-            target = self.cargo_target_dir,
-            sysroot = sysroot.display(),
-            gcc_path = gcc_path,
-        );
-        env.insert("LIBRARY_PATH".to_string(), ld_library_path.clone());
-        env.insert("LD_LIBRARY_PATH".to_string(), ld_library_path.clone());
-        env.insert("DYLD_LIBRARY_PATH".to_string(), ld_library_path);
-
         // NOTE: To avoid the -fno-inline errors, use /opt/gcc/bin/gcc instead of cc.
         // To do so, add a symlink for cc to /opt/gcc/bin/gcc in our PATH.
         // Another option would be to add the following Rust flag: -Clinker=/opt/gcc/bin/gcc

build_system/src/test.rs

@@ -214,14 +214,6 @@ fn cargo_tests(test_env: &Env, test_args: &TestArg) -> Result<(), String> {
     // We don't want to pass things like `RUSTFLAGS`, since they contain the -Zcodegen-backend flag.
     // That would force `cg_gcc` to *rebuild itself* and only then run tests, which is undesirable.
     let mut env = HashMap::new();
-    env.insert(
-        "LD_LIBRARY_PATH".into(),
-        test_env.get("LD_LIBRARY_PATH").expect("LD_LIBRARY_PATH missing!").to_string(),
-    );
-    env.insert(
-        "LIBRARY_PATH".into(),
-        test_env.get("LIBRARY_PATH").expect("LIBRARY_PATH missing!").to_string(),
-    );
     env.insert(
         "CG_RUSTFLAGS".into(),
         test_env.get("CG_RUSTFLAGS").map(|s| s.as_str()).unwrap_or("").to_string(),
@@ -1276,11 +1268,6 @@ pub fn run() -> Result<(), String> {
 
     if !args.use_system_gcc {
         args.config_info.setup_gcc_path()?;
-        let gcc_path = args.config_info.gcc_path.clone().expect(
-            "The config module should have emitted an error if the GCC path wasn't provided",
-        );
-        env.insert("LIBRARY_PATH".to_string(), gcc_path.clone());
-        env.insert("LD_LIBRARY_PATH".to_string(), gcc_path);
     }
 
     build_if_no_backend(&env, &args)?;

src/lib.rs

@@ -72,7 +72,7 @@ use std::any::Any;
 use std::ffi::CString;
 use std::fmt::Debug;
 use std::ops::Deref;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Mutex};
 
@@ -180,13 +180,17 @@ pub struct GccCodegenBackend {
 
 static LTO_SUPPORTED: AtomicBool = AtomicBool::new(false);
 
-fn load_libgccjit_if_needed() {
+fn load_libgccjit_if_needed(sysroot_path: &Path) {
     if gccjit::is_loaded() {
         // Do not load a libgccjit second time.
         return;
     }
 
-    let string = CString::new("libgccjit.so").expect("string to libgccjit path");
+    let sysroot_lib_dir = sysroot_path.join("lib");
+    let libgccjit_target_lib_file = sysroot_lib_dir.join("libgccjit.so");
+    let path = libgccjit_target_lib_file.to_str().expect("libgccjit path");
+
+    let string = CString::new(path).expect("string to libgccjit path");
 
     if let Err(error) = gccjit::load(&string) {
         panic!("Cannot load libgccjit.so: {}", error);
@@ -202,12 +206,12 @@ impl CodegenBackend for GccCodegenBackend {
         "gcc"
     }
 
-    fn init(&self, _sess: &Session) {
+    fn init(&self, sess: &Session) {
-        load_libgccjit_if_needed();
+        load_libgccjit_if_needed(sess.opts.sysroot.path());
 
         #[cfg(feature = "master")]
         {
-            let target_cpu = target_cpu(_sess);
+            let target_cpu = target_cpu(sess);
 
             // Get the second TargetInfo with the correct CPU features by setting the arch.
             let context = Context::default();

tests/lang_tests_common.rs

@@ -2,11 +2,10 @@
 
 #![allow(clippy::uninlined_format_args)]
 
-use std::env::{self, current_dir};
+use std::env::current_dir;
 use std::path::{Path, PathBuf};
 use std::process::Command;
 
-use boml::Toml;
 use lang_tester::LangTester;
 use tempfile::TempDir;
 
@@ -23,29 +22,6 @@ pub fn main_inner(profile: Profile) {
     let current_dir = current_dir().expect("current dir");
     let current_dir = current_dir.to_str().expect("current dir").to_string();
 
-    let manifest_dir = Path::new(env!("CARGO_MANIFEST_DIR"));
-
-    let gcc_path = std::fs::read_to_string(manifest_dir.join("config.toml"))
-        .ok()
-        .and_then(|v| {
-            let toml = Toml::parse(&v).expect("Failed to parse `config.toml`");
-            toml.get_string("gcc-path").map(PathBuf::from).ok()
-        })
-        .unwrap_or_else(|| {
-            // then we try to retrieve it from the `target` folder.
-            let commit = include_str!("../libgccjit.version").trim();
-            Path::new("build/libgccjit").join(commit)
-        });
-
-    let gcc_path = Path::new(&gcc_path)
-        .canonicalize()
-        .expect("failed to get absolute path of `gcc-path`")
-        .display()
-        .to_string();
-    unsafe {
-        env::set_var("LD_LIBRARY_PATH", gcc_path);
-    }
-
     fn rust_filter(path: &Path) -> bool {
         path.is_file() && path.extension().expect("extension").to_str().expect("to_str") == "rs"
     }