Move the libgccjit.so file in a target directory

Since GCC is not multi-target, we need multiple libgccjit.so.
Our solution to have a directory per target so that we can have multiple
libgccjit.so.

Author: antoyo

compiler/rustc_codegen_gcc/src/lib.rs

@@ -181,18 +181,18 @@ pub struct GccCodegenBackend {
 
 static LTO_SUPPORTED: AtomicBool = AtomicBool::new(false);
 
-fn libgccjit_path(sysroot_path: &Path) -> PathBuf {
+fn libgccjit_path(sysroot_path: &Path, target_triple: &str) -> PathBuf {
     let sysroot_lib_dir = sysroot_path.join("lib");
-    sysroot_lib_dir.join("libgccjit.so")
+    sysroot_lib_dir.join(target_triple).join("libgccjit.so")
 }
 
-fn load_libgccjit_if_needed(sysroot_path: &Path) {
+fn load_libgccjit_if_needed(sysroot_path: &Path, target_triple: &str) {
     if gccjit::is_loaded() {
         // Do not load a libgccjit second time.
         return;
     }
 
-    let libgccjit_target_lib_file = libgccjit_path(sysroot_path);
+    let libgccjit_target_lib_file = libgccjit_path(sysroot_path, target_triple);
     let path = libgccjit_target_lib_file.to_str().expect("libgccjit path");
 
     let string = CString::new(path).expect("string to libgccjit path");
@@ -216,9 +216,9 @@ impl CodegenBackend for GccCodegenBackend {
         // 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);
+            let libgccjit_target_lib_file = libgccjit_path(path, &sess.target.llvm_target);
             if let Ok(true) = fs::exists(libgccjit_target_lib_file) {
-                load_libgccjit_if_needed(path);
+                load_libgccjit_if_needed(path, &sess.target.llvm_target);
                 break;
             }
         }

src/bootstrap/src/core/build_steps/gcc.rs

@@ -27,6 +27,7 @@ pub struct Gcc {
 #[derive(Clone)]
 pub struct GccOutput {
     pub libgccjit: PathBuf,
+    target: TargetSelection,
 }
 
 impl GccOutput {
@@ -46,7 +47,9 @@ impl GccOutput {
             format!("Cannot find libgccjit at {}", self.libgccjit.display())
         );
 
-        let dst = directory.join(target_filename);
+        let dest_dir = directory.join(self.target);
+        t!(fs::create_dir_all(&dest_dir));
+        let dst = dest_dir.join(target_filename);
         builder.copy_link(&actual_libgccjit_path, &dst, FileType::NativeLibrary);
     }
 }
@@ -70,7 +73,7 @@ impl Step for Gcc {
 
         // If GCC has already been built, we avoid building it again.
         let metadata = match get_gcc_build_status(builder, target) {
-            GccBuildStatus::AlreadyBuilt(path) => return GccOutput { libgccjit: path },
+            GccBuildStatus::AlreadyBuilt(path) => return GccOutput { libgccjit: path, target },
             GccBuildStatus::ShouldBuild(m) => m,
         };
 
@@ -80,14 +83,14 @@ impl Step for Gcc {
 
         let libgccjit_path = libgccjit_built_path(&metadata.install_dir);
         if builder.config.dry_run() {
-            return GccOutput { libgccjit: libgccjit_path };
+            return GccOutput { libgccjit: libgccjit_path, target };
         }
 
         build_gcc(&metadata, builder, target);
 
         t!(metadata.stamp.write());
 
-        GccOutput { libgccjit: libgccjit_path }
+        GccOutput { libgccjit: libgccjit_path, target }
     }
 }