WIP: Add flag to use the LLVM sysroot

Author: antoyo

.github/workflows/ci.yml

@@ -96,6 +96,8 @@ jobs:
 
     - name: Build
       run: |
+        mkdir -p /home/runner/.rustup/toolchains/nightly-2026-04-29-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/codegen-backends/lib/x86_64-unknown-linux-gnu/
+        ln -s /usr/lib/libgccjit.so /home/runner/.rustup/toolchains/nightly-2026-04-29-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/codegen-backends/lib/x86_64-unknown-linux-gnu/libgccjit.so
         ./y.sh build --sysroot
         ./y.sh test --cargo-tests
 

build_system/src/config.rs

@@ -394,8 +394,8 @@ impl ConfigInfo {
             rustflags.push(format!("-Zcodegen-backend={backend}"));
         } else {
             rustflags.extend_from_slice(&[
-                "--sysroot".to_string(),
-                self.sysroot_path.clone(),
+                /*"--sysroot".to_string(),
+                self.sysroot_path.clone(),*/
                 format!("-Zcodegen-backend={}", self.cg_backend_path),
             ]);
         }