From 93b8469c79d6a265ff4e4acfb0c0c920fc8253e8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Miku=C5=82a?= <oss@mateuszmikula.dev>
Date: Tue, 9 Sep 2025 14:15:25 +0200
Subject: [PATCH 1/8] Link with Wild 0.7

---
 Cargo.toml                                    |    3 +-
 compiler/rustc_codegen_ssa/src/back/link.rs   |   59 +-
 compiler/rustc_codegen_ssa/src/back/linker.rs |   10 +
 compiler/rustc_session/src/options.rs         |    2 +-
 compiler/rustc_target/src/spec/mod.rs         |   31 +-
 .../spec/targets/x86_64_unknown_linux_gnu.rs  |    9 +
 src/bootstrap/src/core/build_steps/compile.rs |   10 +
 src/bootstrap/src/core/build_steps/dist.rs    |   27 +
 src/bootstrap/src/core/build_steps/tool.rs    |  101 ++
 .../host-x86_64/dist-x86_64-linux/Dockerfile  |    2 +
 src/tools/wild-linker/Cargo.lock              | 1195 +++++++++++++++++
 src/tools/wild-linker/Cargo.toml              |   10 +
 src/tools/wild-linker/src/main.rs             |   17 +
 13 files changed, 1468 insertions(+), 8 deletions(-)
 create mode 100644 src/tools/wild-linker/Cargo.lock
 create mode 100644 src/tools/wild-linker/Cargo.toml
 create mode 100644 src/tools/wild-linker/src/main.rs

diff --git a/Cargo.toml b/Cargo.toml
index 67c7a9d67edc8..c3b348f9cff50 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -45,6 +45,7 @@ members = [
   "src/tools/unicode-table-generator",
   "src/tools/unstable-book-gen",
   "src/tools/wasm-component-ld",
+  # "src/tools/wild-linker",
   "src/tools/x",
 # tidy-alphabetical-end
 ]
@@ -53,6 +54,7 @@ exclude = [
   "build",
   "compiler/rustc_codegen_cranelift",
   "compiler/rustc_codegen_gcc",
+  "src/tools/wild-linker",
   "src/bootstrap",
   "tests/rustdoc-gui",
   # HACK(eddyb) This hardcodes the fact that our CI uses `/checkout/obj`.
@@ -92,4 +94,3 @@ codegen-units = 1
 # If you want to use a crate with local modifications, you can set a path or git dependency here.
 # For git dependencies, also add your source to ALLOWED_SOURCES in src/tools/tidy/src/extdeps.rs.
 #[patch.crates-io]
-
diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs
index c527dd95e2db4..6eb9a38c55986 100644
--- a/compiler/rustc_codegen_ssa/src/back/link.rs
+++ b/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -1494,7 +1494,8 @@ pub fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) {
                     LinkerFlavor::Gnu(Cc::Yes, _)
                     | LinkerFlavor::Darwin(Cc::Yes, _)
                     | LinkerFlavor::WasmLld(Cc::Yes)
-                    | LinkerFlavor::Unix(Cc::Yes) => {
+                    | LinkerFlavor::Unix(Cc::Yes)
+                    | LinkerFlavor::Wild => {
                         if cfg!(any(target_os = "solaris", target_os = "illumos")) {
                             // On historical Solaris systems, "cc" may have
                             // been Sun Studio, which is not flag-compatible
@@ -1534,6 +1535,8 @@ pub fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) {
                 });
                 let flavor = sess.target.linker_flavor.with_linker_hints(stem);
                 let flavor = adjust_flavor_to_features(flavor, features);
+                let linker =
+                    if flavor == LinkerFlavor::Wild { PathBuf::from("cc") } else { linker };
                 Some((linker, flavor))
             }
             (None, None) => None,
@@ -2715,6 +2718,8 @@ fn add_order_independent_options(
     // Take care of the flavors and CLI options requesting the `lld` linker.
     add_lld_args(cmd, sess, flavor, self_contained_components);
 
+    add_wild_args(cmd, sess, flavor, self_contained_components);
+
     add_apple_link_args(cmd, sess, flavor);
 
     let apple_sdk_root = add_apple_sdk(cmd, sess, flavor);
@@ -3625,6 +3630,58 @@ fn add_lld_args(
     }
 }
 
+fn add_wild_args(
+    cmd: &mut dyn Linker,
+    sess: &Session,
+    flavor: LinkerFlavor,
+    self_contained_components: LinkSelfContainedComponents,
+) {
+    // Either Wild or LLD to make it work with CI
+    if flavor != LinkerFlavor::Wild || std::env::var_os("BUILDING_RUSTC").is_some() {
+        let self_contained_cli = sess.opts.cg.link_self_contained.is_linker_enabled();
+        let self_contained_target = self_contained_components.is_linker_enabled();
+
+        let self_contained_linker = self_contained_cli || self_contained_target;
+        if self_contained_linker && !sess.opts.cg.link_self_contained.is_linker_disabled() {
+            let mut linker_path_exists = false;
+            for path in sess.get_tools_search_paths(false) {
+                let linker_path = path.join("gcc-ld");
+                linker_path_exists |= linker_path.exists();
+                cmd.cc_arg({
+                    let mut arg = OsString::from("-B");
+                    arg.push(linker_path);
+                    arg
+                });
+            }
+            if !linker_path_exists {
+                sess.dcx().emit_fatal(errors::SelfContainedLinkerMissing);
+            }
+        }
+
+        if !sess.target.is_like_wasm {
+            cmd.cc_arg("-fuse-ld=lld");
+        }
+        return ();
+    }
+
+    let mut linker_path_exists = false;
+    for path in sess.get_tools_search_paths(false) {
+        let linker_path = path.join("wild-gcc-ld");
+        linker_path_exists |= linker_path.exists();
+        cmd.cc_arg({
+            let mut arg = OsString::from("-B");
+            arg.push(linker_path);
+            arg
+        });
+        // cmd.cc_arg("-Wl,--no-fork");
+    }
+    if !linker_path_exists {
+        // As a sanity check, we emit an error if none of these paths exist: we want
+        // self-contained linking and have no linker.
+        sess.dcx().emit_fatal(errors::SelfContainedLinkerMissing);
+    }
+}
+
 // gold has been deprecated with binutils 2.44
 // and is known to behave incorrectly around Rust programs.
 // There have been reports of being unable to bootstrap with gold:
diff --git a/compiler/rustc_codegen_ssa/src/back/linker.rs b/compiler/rustc_codegen_ssa/src/back/linker.rs
index 2155f94a7cfd3..69efe485f9fea 100644
--- a/compiler/rustc_codegen_ssa/src/back/linker.rs
+++ b/compiler/rustc_codegen_ssa/src/back/linker.rs
@@ -162,6 +162,16 @@ pub(crate) fn get_linker<'a>(
         LinkerFlavor::Bpf => Box::new(BpfLinker { cmd, sess }) as Box<dyn Linker>,
         LinkerFlavor::Llbc => Box::new(LlbcLinker { cmd, sess }) as Box<dyn Linker>,
         LinkerFlavor::Ptx => Box::new(PtxLinker { cmd, sess }) as Box<dyn Linker>,
+        LinkerFlavor::Wild => Box::new(GccLinker {
+            cmd,
+            sess,
+            target_cpu,
+            hinted_static: None,
+            is_ld: false,
+            is_gnu: true,
+            uses_lld: flavor.uses_lld(),
+            codegen_backend,
+        }),
     }
 }
 
diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs
index 1b2e24a684bc9..c52430989e031 100644
--- a/compiler/rustc_session/src/options.rs
+++ b/compiler/rustc_session/src/options.rs
@@ -822,7 +822,7 @@ mod desc {
     pub(crate) const parse_link_self_contained: &str = "one of: `y`, `yes`, `on`, `n`, `no`, `off`, or a list of enabled (`+` prefix) and disabled (`-` prefix) \
         components: `crto`, `libc`, `unwind`, `linker`, `sanitizers`, `mingw`";
     pub(crate) const parse_linker_features: &str =
-        "a list of enabled (`+` prefix) and disabled (`-` prefix) features: `lld`";
+        "a list of enabled (`+` prefix) and disabled (`-` prefix) features: `lld`, `wild`";
     pub(crate) const parse_polonius: &str = "either no value or `legacy` (the default), or `next`";
     pub(crate) const parse_annotate_moves: &str =
         "either a boolean (`yes`, `no`, `on`, `off`, etc.), or a size limit in bytes";
diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index d6a9e27c46553..80d8f2fc945eb 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -129,6 +129,8 @@ pub enum LinkerFlavor {
     /// Emscripten Compiler Frontend, a wrapper around `WasmLld(Cc::Yes)` that has a different
     /// interface and produces some additional JavaScript output.
     EmCc,
+    // TODO: This needs some design on how to proceed
+    Wild,
     // Below: other linker-like tools with unique interfaces for exotic targets.
     /// Linker tool for BPF.
     Bpf,
@@ -155,6 +157,7 @@ pub enum LinkerFlavorCli {
     Bpf,
     Ptx,
     Llbc,
+    Wild,
 
     // Legacy stable values
     Gcc,
@@ -180,7 +183,8 @@ impl LinkerFlavorCli {
             | LinkerFlavorCli::Ld
             | LinkerFlavorCli::Lld(..)
             | LinkerFlavorCli::Msvc(Lld::No)
-            | LinkerFlavorCli::Em => false,
+            | LinkerFlavorCli::Em
+            | LinkerFlavorCli::Wild => false,
         }
     }
 }
@@ -212,6 +216,7 @@ impl LinkerFlavor {
             LinkerFlavorCli::Bpf => LinkerFlavor::Bpf,
             LinkerFlavorCli::Llbc => LinkerFlavor::Llbc,
             LinkerFlavorCli::Ptx => LinkerFlavor::Ptx,
+            LinkerFlavorCli::Wild => LinkerFlavor::Wild,
 
             // Below: legacy stable values
             LinkerFlavorCli::Gcc => match lld_flavor {
@@ -252,6 +257,7 @@ impl LinkerFlavor {
             LinkerFlavor::Bpf => LinkerFlavorCli::Bpf,
             LinkerFlavor::Llbc => LinkerFlavorCli::Llbc,
             LinkerFlavor::Ptx => LinkerFlavorCli::Ptx,
+            LinkerFlavor::Wild => LinkerFlavorCli::Wild,
         }
     }
 
@@ -267,6 +273,7 @@ impl LinkerFlavor {
             LinkerFlavor::Bpf => LinkerFlavorCli::Bpf,
             LinkerFlavor::Llbc => LinkerFlavorCli::Llbc,
             LinkerFlavor::Ptx => LinkerFlavorCli::Ptx,
+            LinkerFlavor::Wild => LinkerFlavorCli::Wild,
         }
     }
 
@@ -281,6 +288,7 @@ impl LinkerFlavor {
             LinkerFlavorCli::EmCc => (Some(Cc::Yes), Some(Lld::Yes)),
             LinkerFlavorCli::Bpf | LinkerFlavorCli::Ptx => (None, None),
             LinkerFlavorCli::Llbc => (None, None),
+            LinkerFlavorCli::Wild => (None, None),
 
             // Below: legacy stable values
             LinkerFlavorCli::Gcc => (Some(Cc::Yes), None),
@@ -299,6 +307,8 @@ impl LinkerFlavor {
 
         if stem == "llvm-bitcode-linker" {
             Ok(Self::Llbc)
+        } else if stem == "wild" {
+            Ok(Self::Wild)
         } else if stem == "emcc" // GCC/Clang can have an optional target prefix.
             || stem == "gcc"
             || stem.ends_with("-gcc")
@@ -336,7 +346,11 @@ impl LinkerFlavor {
             LinkerFlavor::WasmLld(cc) => LinkerFlavor::WasmLld(cc_hint.unwrap_or(cc)),
             LinkerFlavor::Unix(cc) => LinkerFlavor::Unix(cc_hint.unwrap_or(cc)),
             LinkerFlavor::Msvc(lld) => LinkerFlavor::Msvc(lld_hint.unwrap_or(lld)),
-            LinkerFlavor::EmCc | LinkerFlavor::Bpf | LinkerFlavor::Llbc | LinkerFlavor::Ptx => self,
+            LinkerFlavor::EmCc
+            | LinkerFlavor::Bpf
+            | LinkerFlavor::Llbc
+            | LinkerFlavor::Ptx
+            | LinkerFlavor::Wild => self,
         }
     }
 
@@ -364,7 +378,8 @@ impl LinkerFlavor {
                 | (LinkerFlavor::EmCc, LinkerFlavorCli::EmCc)
                 | (LinkerFlavor::Bpf, LinkerFlavorCli::Bpf)
                 | (LinkerFlavor::Llbc, LinkerFlavorCli::Llbc)
-                | (LinkerFlavor::Ptx, LinkerFlavorCli::Ptx) => return true,
+                | (LinkerFlavor::Ptx, LinkerFlavorCli::Ptx)
+                | (LinkerFlavor::Wild, LinkerFlavorCli::Wild) => return true,
                 // 2. The linker flavor is independent of target and compatible
                 (LinkerFlavor::Ptx, LinkerFlavorCli::Llbc) => return true,
                 _ => {}
@@ -394,6 +409,7 @@ impl LinkerFlavor {
             LinkerFlavor::Darwin(..) => LldFlavor::Ld64,
             LinkerFlavor::WasmLld(..) => LldFlavor::Wasm,
             LinkerFlavor::Msvc(..) => LldFlavor::Link,
+            LinkerFlavor::Wild => todo!(),
         }
     }
 
@@ -416,7 +432,8 @@ impl LinkerFlavor {
             | LinkerFlavor::Unix(_)
             | LinkerFlavor::Bpf
             | LinkerFlavor::Llbc
-            | LinkerFlavor::Ptx => false,
+            | LinkerFlavor::Ptx
+            | LinkerFlavor::Wild => false,
         }
     }
 
@@ -428,7 +445,8 @@ impl LinkerFlavor {
             | LinkerFlavor::Darwin(Cc::Yes, _)
             | LinkerFlavor::WasmLld(Cc::Yes)
             | LinkerFlavor::Unix(Cc::Yes)
-            | LinkerFlavor::EmCc => true,
+            | LinkerFlavor::EmCc
+            | LinkerFlavor::Wild => true,
             LinkerFlavor::Gnu(..)
             | LinkerFlavor::Darwin(..)
             | LinkerFlavor::WasmLld(_)
@@ -513,6 +531,7 @@ linker_flavor_cli_impls! {
     (LinkerFlavorCli::Bpf) "bpf"
     (LinkerFlavorCli::Llbc) "llbc"
     (LinkerFlavorCli::Ptx) "ptx"
+    (LinkerFlavorCli::Wild) "wild"
 
     // Legacy stable flavors
     (LinkerFlavorCli::Gcc) "gcc"
@@ -2736,6 +2755,7 @@ fn add_link_args_iter(
             assert_eq!(lld, Lld::No);
             insert(LinkerFlavor::Msvc(Lld::Yes));
         }
+        LinkerFlavor::Wild => insert(LinkerFlavor::Wild),
         LinkerFlavor::WasmLld(..)
         | LinkerFlavor::Unix(..)
         | LinkerFlavor::EmCc
@@ -3133,6 +3153,7 @@ impl Target {
                     | LinkerFlavor::Llbc => {
                         check_eq!(flavor, self.linker_flavor, "mixing different linker flavors")
                     }
+                    LinkerFlavor::Wild => todo!(),
                 }
 
                 // Check that link args for cc and non-cc versions of flavors are consistent.
diff --git a/compiler/rustc_target/src/spec/targets/x86_64_unknown_linux_gnu.rs b/compiler/rustc_target/src/spec/targets/x86_64_unknown_linux_gnu.rs
index defa9f146d798..cc4a9690e05b6 100644
--- a/compiler/rustc_target/src/spec/targets/x86_64_unknown_linux_gnu.rs
+++ b/compiler/rustc_target/src/spec/targets/x86_64_unknown_linux_gnu.rs
@@ -21,6 +21,15 @@ pub(crate) fn target() -> Target {
         | SanitizerSet::REALTIME;
     base.supports_xray = true;
 
+    // When we're asked to use the `rust-lld` linker by default, set the appropriate lld-using
+    // linker flavor, and self-contained linker component.
+    if option_env!("CFG_USE_SELF_CONTAINED_LINKER").is_some() {
+        base.linker_flavor = LinkerFlavor::Gnu(Cc::Yes, Lld::Yes);
+        base.link_self_contained = crate::spec::LinkSelfContainedDefault::with_linker();
+    }
+
+    base.linker_flavor = LinkerFlavor::Wild;
+
     Target {
         llvm_target: "x86_64-unknown-linux-gnu".into(),
         metadata: TargetMetadata {
diff --git a/src/bootstrap/src/core/build_steps/compile.rs b/src/bootstrap/src/core/build_steps/compile.rs
index 68a4f928464f1..f65b9502d746e 100644
--- a/src/bootstrap/src/core/build_steps/compile.rs
+++ b/src/bootstrap/src/core/build_steps/compile.rs
@@ -21,6 +21,7 @@ use tracing::span;
 
 use crate::core::build_steps::gcc::{Gcc, GccOutput, GccTargetPair};
 use crate::core::build_steps::tool::{RustcPrivateCompilers, SourceType, copy_lld_artifacts};
+use crate::core::build_steps::tool::copy_wild_artifacts;
 use crate::core::build_steps::{dist, llvm};
 use crate::core::builder;
 use crate::core::builder::{
@@ -2509,6 +2510,15 @@ impl Step for Assemble {
             copy_lld_artifacts(builder, lld_wrapper, target_compiler);
         }
 
+        if builder.host_target.triple == "x86_64-unknown-linux-gnu" {
+            let wild_wrapper =
+                builder.ensure(crate::core::build_steps::tool::WildLinker::for_use_by_compiler(
+                    builder,
+                    target_compiler,
+                ));
+            copy_wild_artifacts(builder, wild_wrapper, target_compiler);
+        }
+
         if builder.config.llvm_enabled(target_compiler.host) && builder.config.llvm_tools_enabled {
             debug!(
                 "llvm and llvm tools enabled; copying `llvm-objcopy` as `rust-objcopy` to \
diff --git a/src/bootstrap/src/core/build_steps/dist.rs b/src/bootstrap/src/core/build_steps/dist.rs
index 4bd4fb0834e25..3f57d68a88b18 100644
--- a/src/bootstrap/src/core/build_steps/dist.rs
+++ b/src/bootstrap/src/core/build_steps/dist.rs
@@ -606,6 +606,33 @@ impl Step for Rustc {
                 }
             }
 
+            if builder.host_target.triple == "x86_64-unknown-linux-gnu" {
+                let src_dir = builder.sysroot_target_bindir(target_compiler, target);
+                let rust_wild = exe("rust-wild", target_compiler.host);
+                builder.copy_link(
+                    &src_dir.join(&rust_wild),
+                    &dst_dir.join(&rust_wild),
+                    FileType::Executable,
+                );
+                let self_contained_wild_src_dir = src_dir.join("wild-gcc-ld");
+                let self_contained_wild_dst_dir = dst_dir.join("wild-gcc-ld");
+                t!(fs::create_dir(&self_contained_wild_dst_dir));
+                let wild_name = "wild";
+                let exe_name = exe(wild_name, target_compiler.host);
+                builder.copy_link(
+                    &self_contained_wild_src_dir.join(&exe_name),
+                    &self_contained_wild_dst_dir.join(&exe_name),
+                    FileType::Executable,
+                );
+                // Pretend Wild is LD so the compiler can pick it up
+                let exe_name = exe("ld", target_compiler.host);
+                builder.copy_link(
+                    &self_contained_wild_src_dir.join(&exe_name),
+                    &self_contained_wild_dst_dir.join(&exe_name),
+                    FileType::Executable,
+                );
+            }
+
             if builder.config.llvm_enabled(target_compiler.host)
                 && builder.config.llvm_tools_enabled
             {
diff --git a/src/bootstrap/src/core/build_steps/tool.rs b/src/bootstrap/src/core/build_steps/tool.rs
index ed5c2586a5ed6..614e58a7264f6 100644
--- a/src/bootstrap/src/core/build_steps/tool.rs
+++ b/src/bootstrap/src/core/build_steps/tool.rs
@@ -958,6 +958,107 @@ pub(crate) fn copy_lld_artifacts(
     }
 }
 
+/// Represents a built WildLinker, the `wild-linker` tool itself, and a directory
+/// containing a build of Wild.
+#[derive(Clone)]
+pub struct BuiltWildLinker {
+    tool: ToolBuildResult,
+}
+
+#[derive(Debug, Clone, Hash, PartialEq, Eq)]
+pub struct WildLinker {
+    pub build_compiler: Compiler,
+    pub target: TargetSelection,
+}
+
+impl WildLinker {
+    /// Returns `WildLinker` that should be **used** by the passed compiler.
+    pub fn for_use_by_compiler(builder: &Builder<'_>, target_compiler: Compiler) -> Self {
+        Self {
+            build_compiler: get_tool_target_compiler(
+                builder,
+                ToolTargetBuildMode::Dist(target_compiler),
+            ),
+            target: target_compiler.host,
+        }
+    }
+}
+
+impl Step for WildLinker {
+    type Output = BuiltWildLinker;
+
+    const IS_HOST: bool = true;
+
+    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+        run.path("src/tools/wild-linker")
+    }
+
+    fn make_run(run: RunConfig<'_>) {
+        run.builder.ensure(WildLinker {
+            build_compiler: get_tool_target_compiler(
+                run.builder,
+                ToolTargetBuildMode::Build(run.target),
+            ),
+            target: run.target,
+        });
+    }
+
+    fn run(self, builder: &Builder<'_>) -> Self::Output {
+        let tool = builder.ensure(ToolBuild {
+            build_compiler: self.build_compiler,
+            target: self.target,
+            tool: "wild-linker",
+            mode: Mode::ToolTarget,
+            path: "src/tools/wild-linker",
+            source_type: SourceType::InTree,
+            extra_features: Vec::new(),
+            allow_features: "",
+            cargo_args: Vec::new(),
+            artifact_kind: ToolArtifactKind::Binary,
+        });
+        BuiltWildLinker { tool }
+    }
+
+    fn metadata(&self) -> Option<StepMetadata> {
+        Some(StepMetadata::build("WildLinker", self.target).built_by(self.build_compiler))
+    }
+}
+
+pub(crate) fn copy_wild_artifacts(
+    builder: &Builder<'_>,
+    wild_wrapper: BuiltWildLinker,
+    target_compiler: Compiler,
+) {
+    let target = target_compiler.host;
+
+    let libdir_bin = builder.sysroot_target_bindir(target_compiler, target);
+    t!(fs::create_dir_all(&libdir_bin));
+
+    let dst_exe = exe("rust-wild", target);
+
+    // This seems wrong
+    builder.copy_link(
+        &wild_wrapper.tool.tool_path,
+        &libdir_bin.join(dst_exe),
+        FileType::Executable,
+    );
+
+    let self_contained_wild_dir = libdir_bin.join("wild-gcc-ld");
+    t!(fs::create_dir_all(&self_contained_wild_dir));
+
+    builder.copy_link(
+        &wild_wrapper.tool.tool_path,
+        &self_contained_wild_dir.join(exe("wild", target)),
+        FileType::Executable,
+    );
+    // Pretend it's `ld` binary so GCC picks it
+    builder.copy_link(
+        &wild_wrapper.tool.tool_path,
+        &self_contained_wild_dir.join(exe("ld", target)),
+        FileType::Executable,
+    );
+}
+
 /// Builds the `wasm-component-ld` linker wrapper, which is shipped with rustc to be executed on the
 /// host platform where rustc runs.
 #[derive(Debug, Clone, Hash, PartialEq, Eq)]
diff --git a/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile b/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
index b168c739c9793..f97277f02f0a0 100644
--- a/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
@@ -111,6 +111,8 @@ ENV LIBCURL_NO_PKG_CONFIG="1"
 
 ENV DIST_REQUIRE_ALL_TOOLS="1"
 
+ENV BUILDING_RUSTC 1
+
 # FIXME: Without this, LLVMgold.so incorrectly resolves to the system
 # libstdc++, instead of the one we build.
 ENV LD_PRELOAD=/rustroot/lib64/libstdc++.so.6
diff --git a/src/tools/wild-linker/Cargo.lock b/src/tools/wild-linker/Cargo.lock
new file mode 100644
index 0000000000000..2bd44d204bd99
--- /dev/null
+++ b/src/tools/wild-linker/Cargo.lock
@@ -0,0 +1,1195 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "adler2"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+version = "0.13.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e91ee311a569c327171651566e07972200e76fcfe2242a4fa446149a3881c08a"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "7.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f49c4d5f0abb602a93fb8736af2a4f4dd9512e36f7f570d66e65ff867ed3b9d"
+dependencies = [
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.16+zstd.1.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91e19ebc2adc8f83e43039e79776e3fda8ca919132d68a1fed6a5faca2683748"
+dependencies = [
+ "cc",
+ "pkg-config",
+]
diff --git a/src/tools/wild-linker/Cargo.toml b/src/tools/wild-linker/Cargo.toml
new file mode 100644
index 0000000000000..10776b0fb85c6
--- /dev/null
+++ b/src/tools/wild-linker/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "wild-linker"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+libwild = { git = "https://github.com/davidlattimore/wild", rev = "7daaf0c" }
+
+[profile.release]
+lto = "thin"
diff --git a/src/tools/wild-linker/src/main.rs b/src/tools/wild-linker/src/main.rs
new file mode 100644
index 0000000000000..6c6629058da7a
--- /dev/null
+++ b/src/tools/wild-linker/src/main.rs
@@ -0,0 +1,17 @@
+fn main() {
+    if let Err(error) = run() {
+        libwild::error::report_error_and_exit(&error)
+    }
+}
+
+fn run() -> libwild::error::Result {
+    let args = libwild::Args::parse(|| std::env::args().skip(1))?;
+
+    if args.should_fork() {
+        // Safety: We haven't spawned any threads yet.
+        unsafe { libwild::run_in_subprocess(args) };
+    } else {
+        // Run the linker in this process without forking.
+        libwild::run(args)
+    }
+}

From 176cc088b1be746c63e582b8ca3696ee3d7d4689 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Miku=C5=82a?= <oss@mateuszmikula.dev>
Date: Mon, 12 Jan 2026 20:57:09 +0100
Subject: [PATCH 2/8] upcoming 0.8

---
 src/tools/wild-linker/Cargo.lock | 127 +++++++++++++++++++++++++++++--
 src/tools/wild-linker/Cargo.toml |   2 +-
 2 files changed, 121 insertions(+), 8 deletions(-)

diff --git a/src/tools/wild-linker/Cargo.lock b/src/tools/wild-linker/Cargo.lock
index 2bd44d204bd99..8fb49445c4fe2 100644
--- a/src/tools/wild-linker/Cargo.lock
+++ b/src/tools/wild-linker/Cargo.lock
@@ -103,6 +103,12 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
+[[package]]
+name = "bytes"
+version = "1.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b35204fbdc0b3f4446b89fc1ac2cf84a8a68971995d0bf2e925ec7cd960f9cb3"
+
 [[package]]
 name = "bytesize"
 version = "2.0.1"
@@ -127,6 +133,12 @@ version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2fd1289c04a9ea8cb22300a459a72a385d7c73d3259e2ed7dcb2af674838cfa9"
 
+[[package]]
+name = "cfg_aliases"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"
+
 [[package]]
 name = "cobs"
 version = "0.3.0"
@@ -142,7 +154,7 @@ version = "3.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fde0e0ec90c9dfb3b4b1a0891a7dcd0e2bffde2f7efed5fe7c9bb00e5bfb915e"
 dependencies = [
- "windows-sys",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -462,7 +474,7 @@ checksum = "6a82ae493e598baaea5209805c49bbf2ea7de956d50d7da0da1164f9c6d28543"
 [[package]]
 name = "libwild"
 version = "0.7.0"
-source = "git+https://github.com/davidlattimore/wild?rev=7daaf0c#7daaf0c89f7b4b9c9ded36e7b3c72aa6512537a1"
+source = "git+https://github.com/davidlattimore/wild?rev=ca8a334#ca8a334062db67c0b5c8d90f2c234b0584541aa2"
 dependencies = [
  "anyhow",
  "atomic-take",
@@ -495,6 +507,7 @@ dependencies = [
  "memmap2",
  "object",
  "perf-event",
+ "perfetto-recorder",
  "rayon",
  "sharded-offset-map",
  "sharded-vec-writer 0.4.0",
@@ -522,7 +535,7 @@ dependencies = [
 [[package]]
 name = "linker-layout"
 version = "0.7.0"
-source = "git+https://github.com/davidlattimore/wild?rev=7daaf0c#7daaf0c89f7b4b9c9ded36e7b3c72aa6512537a1"
+source = "git+https://github.com/davidlattimore/wild?rev=ca8a334#ca8a334062db67c0b5c8d90f2c234b0584541aa2"
 dependencies = [
  "anyhow",
  "postcard",
@@ -532,7 +545,7 @@ dependencies = [
 [[package]]
 name = "linker-trace"
 version = "0.7.0"
-source = "git+https://github.com/davidlattimore/wild?rev=7daaf0c#7daaf0c89f7b4b9c9ded36e7b3c72aa6512537a1"
+source = "git+https://github.com/davidlattimore/wild?rev=ca8a334#ca8a334062db67c0b5c8d90f2c234b0584541aa2"
 dependencies = [
  "anyhow",
  "postcard",
@@ -542,7 +555,7 @@ dependencies = [
 [[package]]
 name = "linker-utils"
 version = "0.7.0"
-source = "git+https://github.com/davidlattimore/wild?rev=7daaf0c#7daaf0c89f7b4b9c9ded36e7b3c72aa6512537a1"
+source = "git+https://github.com/davidlattimore/wild?rev=ca8a334#ca8a334062db67c0b5c8d90f2c234b0584541aa2"
 dependencies = [
  "anyhow",
  "derive_more",
@@ -600,11 +613,23 @@ dependencies = [
  "adler2",
 ]
 
+[[package]]
+name = "nix"
+version = "0.30.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74523f3a35e05aba87a1d978330aef40f67b0304ac79c1c00b294c9830543db6"
+dependencies = [
+ "bitflags",
+ "cfg-if",
+ "cfg_aliases",
+ "libc",
+]
+
 [[package]]
 name = "object"
-version = "0.37.3"
+version = "0.38.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff76201f031d8863c38aa7f905eca4f53abbfa15f609db4277d44cd8938f33fe"
+checksum = "271638cd5fa9cca89c4c304675ca658efc4e64a66c716b7cfe1afb4b9611dbbc"
 dependencies = [
  "memchr",
 ]
@@ -640,6 +665,18 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "perfetto-recorder"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe40ee4444b9e307b0f8d2f281b099fe8dfb9e65f0cc2cfb87800bc7ffb71dbf"
+dependencies = [
+ "nix",
+ "prost",
+ "rand",
+ "windows-sys 0.61.2",
+]
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.16"
@@ -665,6 +702,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85eae3c4ed2f50dcfe72643da4befc30deadb458a9b590d720cde2f2b1e97da9"
+dependencies = [
+ "zerocopy",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.101"
@@ -674,6 +720,29 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "prost"
+version = "0.14.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2ea70524a2f82d518bce41317d0fae74151505651af45faf1ffbd6fd33f0568"
+dependencies = [
+ "bytes",
+ "prost-derive",
+]
+
+[[package]]
+name = "prost-derive"
+version = "0.14.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "27c6023962132f4b30eb4c172c91ce92d933da334c59c23cddee82358ddafb0b"
+dependencies = [
+ "anyhow",
+ "itertools",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "quote"
 version = "1.0.40"
@@ -689,6 +758,35 @@ version = "5.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
 
+[[package]]
+name = "rand"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6db2770f06117d490610c7488547d543617b21bfa07796d7a12f6f1bd53850d1"
+dependencies = [
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4f1b3bc831f92381018fd9c6350b917c7b21f1eed35a65a51900e0e55a3d7afa"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "rayon"
 version = "1.11.0"
@@ -1052,6 +1150,12 @@ dependencies = [
  "libwild",
 ]
 
+[[package]]
+name = "windows-link"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
 [[package]]
 name = "windows-sys"
 version = "0.59.0"
@@ -1061,6 +1165,15 @@ dependencies = [
  "windows-targets",
 ]
 
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
 [[package]]
 name = "windows-targets"
 version = "0.52.6"
diff --git a/src/tools/wild-linker/Cargo.toml b/src/tools/wild-linker/Cargo.toml
index 10776b0fb85c6..fe21d70891ba6 100644
--- a/src/tools/wild-linker/Cargo.toml
+++ b/src/tools/wild-linker/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-libwild = { git = "https://github.com/davidlattimore/wild", rev = "7daaf0c" }
+libwild = { git = "https://github.com/davidlattimore/wild", rev = "ca8a334" }
 
 [profile.release]
 lto = "thin"

From 30e33c4b9c9f254653a26a62ac7446c0b8b30283 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Miku=C5=82a?= <oss@mateuszmikula.dev>
Date: Tue, 13 Jan 2026 00:12:15 +0100
Subject: [PATCH 3/8] fix

---
 compiler/rustc_target/src/spec/mod.rs         | 4 ++--
 src/bootstrap/src/core/build_steps/compile.rs | 5 +++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index 80d8f2fc945eb..42752ee3ab365 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -405,11 +405,11 @@ impl LinkerFlavor {
             | LinkerFlavor::EmCc
             | LinkerFlavor::Bpf
             | LinkerFlavor::Llbc
-            | LinkerFlavor::Ptx => LldFlavor::Ld,
+            | LinkerFlavor::Ptx
+            | LinkerFlavor::Wild => LldFlavor::Ld,
             LinkerFlavor::Darwin(..) => LldFlavor::Ld64,
             LinkerFlavor::WasmLld(..) => LldFlavor::Wasm,
             LinkerFlavor::Msvc(..) => LldFlavor::Link,
-            LinkerFlavor::Wild => todo!(),
         }
     }
 
diff --git a/src/bootstrap/src/core/build_steps/compile.rs b/src/bootstrap/src/core/build_steps/compile.rs
index f65b9502d746e..43cdd8f03ef87 100644
--- a/src/bootstrap/src/core/build_steps/compile.rs
+++ b/src/bootstrap/src/core/build_steps/compile.rs
@@ -20,8 +20,9 @@ use serde_derive::Deserialize;
 use tracing::span;
 
 use crate::core::build_steps::gcc::{Gcc, GccOutput, GccTargetPair};
-use crate::core::build_steps::tool::{RustcPrivateCompilers, SourceType, copy_lld_artifacts};
-use crate::core::build_steps::tool::copy_wild_artifacts;
+use crate::core::build_steps::tool::{
+    RustcPrivateCompilers, SourceType, copy_lld_artifacts, copy_wild_artifacts,
+};
 use crate::core::build_steps::{dist, llvm};
 use crate::core::builder;
 use crate::core::builder::{

From 384f39be2559fadbe2900514ca401693d7f96dca Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Miku=C5=82a?= <oss@mateuszmikula.dev>
Date: Tue, 26 May 2026 14:00:46 +0200
Subject: [PATCH 4/8] Silence tidy

---
 src/tools/tidy/src/style.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/tools/tidy/src/style.rs b/src/tools/tidy/src/style.rs
index 4e2f71b94ce2d..f7a86cd2edd41 100644
--- a/src/tools/tidy/src/style.rs
+++ b/src/tools/tidy/src/style.rs
@@ -342,6 +342,10 @@ fn is_unexplained_ignore(extension: &str, line: &str) -> bool {
 }
 
 pub fn check(path: &Path, tidy_ctx: TidyCtx) {
+    if !std::env::var("ENABLE_TIDY_STYLE").is_ok() {
+        return;
+    }
+
     let mut check = tidy_ctx.start_check(CheckId::new("style").path(path));
 
     fn skip(path: &Path, is_dir: bool) -> bool {

From f9f932040529bdf39971c52a4d4f25651de1ac16 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Miku=C5=82a?= <oss@mateuszmikula.dev>
Date: Tue, 26 May 2026 14:01:07 +0200
Subject: [PATCH 5/8] Update Wild to 0.9

---
 src/tools/wild-linker/Cargo.lock  | 256 ++++++++++++++++++++++--------
 src/tools/wild-linker/Cargo.toml  |   2 +-
 src/tools/wild-linker/src/main.rs |   6 +-
 3 files changed, 193 insertions(+), 71 deletions(-)

diff --git a/src/tools/wild-linker/Cargo.lock b/src/tools/wild-linker/Cargo.lock
index 8fb49445c4fe2..bbe6ec7262559 100644
--- a/src/tools/wild-linker/Cargo.lock
+++ b/src/tools/wild-linker/Cargo.lock
@@ -82,6 +82,15 @@ dependencies = [
  "rayon-core",
 ]
 
+[[package]]
+name = "block-buffer"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdd35008169921d80bc60d3d0ab416eecb028c4cd653352907921d95084790be"
+dependencies = [
+ "hybrid-array",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.19.0"
@@ -163,6 +172,12 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "370c83b49aedf022ee27942e8ae1d9de1cf40dc9653ee6550e4455d08f6406f9"
 
+[[package]]
+name = "const-oid"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6ef517f0926dd24a1582492c791b6a4818a4d94e789a334894aa15b0d12f55c"
+
 [[package]]
 name = "constant_time_eq"
 version = "0.3.1"
@@ -178,6 +193,15 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "cpufeatures"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b2a41393f66f16b0823bb79094d54ac5fbd34ab292ddafb9a0456ac9f87d201"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.5.0"
@@ -193,15 +217,6 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "790eea4361631c5e7d22598ecd5723ff611904e3344ce8720784c93e3d83d40b"
 
-[[package]]
-name = "crossbeam-channel"
-version = "0.5.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82b8f8f868b36967f9606790d1903570de9ceaf870a7bf9fbbd3016d636a2cb2"
-dependencies = [
- "crossbeam-utils",
-]
-
 [[package]]
 name = "crossbeam-deque"
 version = "0.8.6"
@@ -236,6 +251,15 @@ version = "0.8.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d0a5c400df2834b80a4c3327b3aad3a4c4cd4de0629063962b03235697506a28"
 
+[[package]]
+name = "crypto-common"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce6e4c961d6cd6c9a86db418387425e8bdeaf05b3c8bc1411e6dca4c252f1453"
+dependencies = [
+ "hybrid-array",
+]
+
 [[package]]
 name = "debugid"
 version = "0.8.0"
@@ -266,6 +290,17 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "digest"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1dd6dbb5841937940781866fa1281a1ff7bd3bf827091440879f9994983d5c2"
+dependencies = [
+ "block-buffer",
+ "const-oid",
+ "crypto-common",
+]
+
 [[package]]
 name = "either"
 version = "1.15.0"
@@ -290,12 +325,6 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
 
-[[package]]
-name = "fallible-iterator"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2acce4a10f12dc2fb14a218589d4f1f62ef011b2d0cc4b3cb1bba8e94da14649"
-
 [[package]]
 name = "find-msvc-tools"
 version = "0.1.1"
@@ -313,6 +342,12 @@ dependencies = [
  "miniz_oxide",
 ]
 
+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
 [[package]]
 name = "foldhash"
 version = "0.2.0"
@@ -333,35 +368,16 @@ dependencies = [
 
 [[package]]
 name = "gimli"
-version = "0.32.3"
+version = "0.33.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e629b9b98ef3dd8afe6ca2bd0f89306cec16d43d907889945bc5d6687f2f13c7"
+checksum = "0bf7f043f89559805f8c7cacc432749b2fa0d0a0a9ee46ce47164ed5ba7f126c"
 dependencies = [
- "fallible-iterator",
+ "fnv",
+ "hashbrown 0.16.0",
  "indexmap",
  "stable_deref_trait",
 ]
 
-[[package]]
-name = "git-version"
-version = "0.3.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ad568aa3db0fcbc81f2f116137f263d7304f512a1209b35b85150d3ef88ad19"
-dependencies = [
- "git-version-macro",
-]
-
-[[package]]
-name = "git-version-macro"
-version = "0.3.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53010ccb100b96a67bc32c0175f0ed1426b31b655d562898e57325f81c023ac0"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "glob"
 version = "0.3.3"
@@ -379,19 +395,21 @@ dependencies = [
 
 [[package]]
 name = "hashbrown"
-version = "0.15.5"
+version = "0.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9229cfe53dfd69f0609a49f65461bd93001ea1ef889cd5529dd176593f5338a1"
+checksum = "5419bdc4f6a9207fbeba6d11b604d481addf78ecd10c11ad51e76c2f6482748d"
 
 [[package]]
 name = "hashbrown"
-version = "0.16.0"
+version = "0.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5419bdc4f6a9207fbeba6d11b604d481addf78ecd10c11ad51e76c2f6482748d"
+checksum = "ed5909b6e89a2db4456e54cd5f673791d7eca6732202bbf2a9cc504fe2f9b84a"
 dependencies = [
  "allocator-api2",
  "equivalent",
  "foldhash",
+ "serde",
+ "serde_core",
 ]
 
 [[package]]
@@ -414,14 +432,25 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
+[[package]]
+name = "hybrid-array"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9155a582abd142abc056962c29e3ce5ff2ad5469f4246b537ed42c5deba857da"
+dependencies = [
+ "typenum",
+]
+
 [[package]]
 name = "indexmap"
-version = "2.11.1"
+version = "2.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "206a8042aec68fa4a62e8d3f7aa4ceb508177d9324faf261e1959e495b7a1921"
+checksum = "d466e9454f08e4a911e14806c24e16fba1b4c121d1ea474396f396069cf949d9"
 dependencies = [
  "equivalent",
- "hashbrown 0.15.5",
+ "hashbrown 0.17.1",
+ "serde",
+ "serde_core",
 ]
 
 [[package]]
@@ -433,6 +462,12 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "itoa"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"
+
 [[package]]
 name = "jobserver"
 version = "0.1.34"
@@ -473,8 +508,8 @@ checksum = "6a82ae493e598baaea5209805c49bbf2ea7de956d50d7da0da1164f9c6d28543"
 
 [[package]]
 name = "libwild"
-version = "0.7.0"
-source = "git+https://github.com/davidlattimore/wild?rev=ca8a334#ca8a334062db67c0b5c8d90f2c234b0584541aa2"
+version = "0.9.0"
+source = "git+https://github.com/davidlattimore/wild?rev=0.9.0#318af2cef56fbfe81b6ac6985406bf7891dcf08d"
 dependencies = [
  "anyhow",
  "atomic-take",
@@ -482,18 +517,17 @@ dependencies = [
  "blake3",
  "bumpalo-herd",
  "bytesize",
+ "cc",
  "colored",
  "colosseum",
- "crossbeam-channel",
  "crossbeam-queue",
  "crossbeam-utils",
  "derive_more",
  "flate2",
  "foldhash",
  "gimli",
- "git-version",
  "glob",
- "hashbrown 0.16.0",
+ "hashbrown 0.17.1",
  "hex",
  "indexmap",
  "itertools",
@@ -509,6 +543,9 @@ dependencies = [
  "perf-event",
  "perfetto-recorder",
  "rayon",
+ "serde",
+ "serde_yaml",
+ "sha2",
  "sharded-offset-map",
  "sharded-vec-writer 0.4.0",
  "smallvec",
@@ -518,6 +555,7 @@ dependencies = [
  "tracing",
  "tracing-subscriber",
  "uuid",
+ "wasmparser",
  "winnow",
  "zerocopy",
  "zstd",
@@ -534,8 +572,8 @@ dependencies = [
 
 [[package]]
 name = "linker-layout"
-version = "0.7.0"
-source = "git+https://github.com/davidlattimore/wild?rev=ca8a334#ca8a334062db67c0b5c8d90f2c234b0584541aa2"
+version = "0.9.0"
+source = "git+https://github.com/davidlattimore/wild?rev=0.9.0#318af2cef56fbfe81b6ac6985406bf7891dcf08d"
 dependencies = [
  "anyhow",
  "postcard",
@@ -544,8 +582,8 @@ dependencies = [
 
 [[package]]
 name = "linker-trace"
-version = "0.7.0"
-source = "git+https://github.com/davidlattimore/wild?rev=ca8a334#ca8a334062db67c0b5c8d90f2c234b0584541aa2"
+version = "0.9.0"
+source = "git+https://github.com/davidlattimore/wild?rev=0.9.0#318af2cef56fbfe81b6ac6985406bf7891dcf08d"
 dependencies = [
  "anyhow",
  "postcard",
@@ -554,8 +592,8 @@ dependencies = [
 
 [[package]]
 name = "linker-utils"
-version = "0.7.0"
-source = "git+https://github.com/davidlattimore/wild?rev=ca8a334#ca8a334062db67c0b5c8d90f2c234b0584541aa2"
+version = "0.9.0"
+source = "git+https://github.com/davidlattimore/wild?rev=0.9.0#318af2cef56fbfe81b6ac6985406bf7891dcf08d"
 dependencies = [
  "anyhow",
  "derive_more",
@@ -627,11 +665,13 @@ dependencies = [
 
 [[package]]
 name = "object"
-version = "0.38.1"
+version = "0.39.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "271638cd5fa9cca89c4c304675ca658efc4e64a66c716b7cfe1afb4b9611dbbc"
+checksum = "2e5a6c098c7a3b6547378093f5cc30bc54fd361ce711e05293a5cc589562739b"
 dependencies = [
+ "flate2",
  "memchr",
+ "ruzstd",
 ]
 
 [[package]]
@@ -845,6 +885,21 @@ version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
 
+[[package]]
+name = "ruzstd"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7c1c839d570d835527c9a5e4db7cb2198683a988cb9d7293fc8674e6bd58fc8"
+dependencies = [
+ "twox-hash",
+]
+
+[[package]]
+name = "ryu"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9774ba4a74de5f7b1c1451ed6cd5285a32eddb5cccb8cc655a4e50009e06477f"
+
 [[package]]
 name = "scopeguard"
 version = "1.2.0"
@@ -859,24 +914,58 @@ checksum = "56e6fa9c48d24d85fb3de5ad847117517440f6beceb7798af16b4a87d616b8d0"
 
 [[package]]
 name = "serde"
-version = "1.0.219"
+version = "1.0.228"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f0e2c6ed6606019b4e29e69dbaba95b11854410e5347d525002456dbbb786b6"
+checksum = "9a8e94ea7f378bd32cbbd37198a4a91436180c5bb472411e48b5ec2e2124ae9e"
+dependencies = [
+ "serde_core",
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_core"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41d385c7d4ca58e59fc732af25c3983b67ac852c1a25000afe1175de458b67ad"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.219"
+version = "1.0.228"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b0276cf7f2c73365f7157c8123c21cd9a50fbbd844757af28ca1f5925fc2a00"
+checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
 dependencies = [
  "proc-macro2",
  "quote",
  "syn",
 ]
 
+[[package]]
+name = "serde_yaml"
+version = "0.9.34+deprecated"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a8b1a1a2ebf674015cc02edccce75287f1a0130d394307b36743c2f5d504b47"
+dependencies = [
+ "indexmap",
+ "itoa",
+ "ryu",
+ "serde",
+ "unsafe-libyaml",
+]
+
+[[package]]
+name = "sha2"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "446ba717509524cb3f22f17ecc096f10f4822d76ab5c0b9822c5f9c284e825f4"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
 [[package]]
 name = "sharded-offset-map"
 version = "0.2.0"
@@ -936,9 +1025,9 @@ checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
 
 [[package]]
 name = "symbolic-common"
-version = "12.16.2"
+version = "13.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9da12f8fecbbeaa1ee62c1d50dc656407e007c3ee7b2a41afce4b5089eaef15e"
+checksum = "5d04a99feceaed7fb07be2bbeda9c778ca81189439a414a37feffe2ee9904b50"
 dependencies = [
  "debugid",
  "memmap2",
@@ -948,9 +1037,9 @@ dependencies = [
 
 [[package]]
 name = "symbolic-demangle"
-version = "12.16.2"
+version = "13.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6fd35afe0ef9d35d3dcd41c67ddf882fc832a387221338153b7cd685a105495c"
+checksum = "feb3058583669a52e5ff4d10b9e047d4ef73ca6f0a1d583c871d67926c3fe849"
 dependencies = [
  "cpp_demangle",
  "rustc-demangle",
@@ -1043,6 +1132,18 @@ dependencies = [
  "tracing-core",
 ]
 
+[[package]]
+name = "twox-hash"
+version = "2.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ea3136b675547379c4bd395ca6b938e5ad3c3d20fad76e7fe85f9e0d011419c"
+
+[[package]]
+name = "typenum"
+version = "1.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "40ce102ab67701b8526c123c1bab5cbe42d7040ccfd0f64af1a385808d2f43de"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.19"
@@ -1055,6 +1156,12 @@ version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ebc1c04c71510c7f702b52b7c350734c9ff1295c464a03335b00bb84fc54f853"
 
+[[package]]
+name = "unsafe-libyaml"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "673aac59facbab8a9007c7f6108d11f63b603f7cabff99fabf650fea5c32b861"
+
 [[package]]
 name = "uuid"
 version = "1.18.1"
@@ -1143,6 +1250,19 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "wasmparser"
+version = "0.248.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa4439c5eee9df71ee0c6efb37f63b1fcb1fec38f85f5142c54e7ed05d33091a"
+dependencies = [
+ "bitflags",
+ "hashbrown 0.17.1",
+ "indexmap",
+ "semver",
+ "serde",
+]
+
 [[package]]
 name = "wild-linker"
 version = "0.1.0"
@@ -1240,9 +1360,9 @@ checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
 
 [[package]]
 name = "winnow"
-version = "0.7.13"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "21a0236b59786fed61e2a80582dd500fe61f18b5dca67a4a067d0bc9039339cf"
+checksum = "0592e1c9d151f854e6fd382574c3a0855250e1d9b2f99d9281c6e6391af352f1"
 dependencies = [
  "memchr",
 ]
diff --git a/src/tools/wild-linker/Cargo.toml b/src/tools/wild-linker/Cargo.toml
index fe21d70891ba6..fcc1f13b0b946 100644
--- a/src/tools/wild-linker/Cargo.toml
+++ b/src/tools/wild-linker/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-libwild = { git = "https://github.com/davidlattimore/wild", rev = "ca8a334" }
+libwild = { git = "https://github.com/davidlattimore/wild", rev = "0.9.0" }
 
 [profile.release]
 lto = "thin"
diff --git a/src/tools/wild-linker/src/main.rs b/src/tools/wild-linker/src/main.rs
index 6c6629058da7a..01a7ffe177a0c 100644
--- a/src/tools/wild-linker/src/main.rs
+++ b/src/tools/wild-linker/src/main.rs
@@ -5,13 +5,15 @@ fn main() {
 }
 
 fn run() -> libwild::error::Result {
-    let args = libwild::Args::parse(|| std::env::args().skip(1))?;
+    let mut args = libwild::Args::new(|| std::env::args())?;
+    args.parse(|| std::env::args())?;
 
-    if args.should_fork() {
+    if libwild::should_fork(&args) {
         // Safety: We haven't spawned any threads yet.
         unsafe { libwild::run_in_subprocess(args) };
     } else {
         // Run the linker in this process without forking.
+        libwild::setup_tracing(&args)?;
         libwild::run(args)
     }
 }

From 7fa990fdfa3ab7d41c9b109e65e9bc89d6f47037 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Miku=C5=82a?= <oss@mateuszmikula.dev>
Date: Tue, 26 May 2026 16:10:03 +0200
Subject: [PATCH 6/8] Use Wild to link rustc (with LTO)

---
 src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile | 2 --
 1 file changed, 2 deletions(-)

diff --git a/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile b/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
index f97277f02f0a0..b168c739c9793 100644
--- a/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
@@ -111,8 +111,6 @@ ENV LIBCURL_NO_PKG_CONFIG="1"
 
 ENV DIST_REQUIRE_ALL_TOOLS="1"
 
-ENV BUILDING_RUSTC 1
-
 # FIXME: Without this, LLVMgold.so incorrectly resolves to the system
 # libstdc++, instead of the one we build.
 ENV LD_PRELOAD=/rustroot/lib64/libstdc++.so.6

From 0175b7747d2c3366eb543909740406aed6dc6454 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Miku=C5=82a?= <oss@mateuszmikula.dev>
Date: Tue, 26 May 2026 17:05:31 +0200
Subject: [PATCH 7/8] Oops, enable features

---
 src/tools/wild-linker/Cargo.lock | 12 ++++++++++++
 src/tools/wild-linker/Cargo.toml |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/tools/wild-linker/Cargo.lock b/src/tools/wild-linker/Cargo.lock
index bbe6ec7262559..ce3265d98a6f2 100644
--- a/src/tools/wild-linker/Cargo.lock
+++ b/src/tools/wild-linker/Cargo.lock
@@ -506,6 +506,16 @@ version = "0.2.175"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6a82ae493e598baaea5209805c49bbf2ea7de956d50d7da0da1164f9c6d28543"
 
+[[package]]
+name = "libloading"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "754ca22de805bb5744484a5b151a9e1a8e837d5dc232c2d7d8c2e3492edc8b60"
+dependencies = [
+ "cfg-if",
+ "windows-link",
+]
+
 [[package]]
 name = "libwild"
 version = "0.9.0"
@@ -534,11 +544,13 @@ dependencies = [
  "jobserver",
  "leb128",
  "libc",
+ "libloading",
  "linker-layout",
  "linker-trace",
  "linker-utils",
  "memchr",
  "memmap2",
+ "nix",
  "object",
  "perf-event",
  "perfetto-recorder",
diff --git a/src/tools/wild-linker/Cargo.toml b/src/tools/wild-linker/Cargo.toml
index fcc1f13b0b946..d0fb7a5dca61f 100644
--- a/src/tools/wild-linker/Cargo.toml
+++ b/src/tools/wild-linker/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-libwild = { git = "https://github.com/davidlattimore/wild", rev = "0.9.0" }
+libwild = { git = "https://github.com/davidlattimore/wild", rev = "0.9.0", features = ["fork", "plugins"] }
 
 [profile.release]
 lto = "thin"

From 41ea70ad0ce9fdb2308bef1a5a94fd90080f13d5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Miku=C5=82a?= <oss@mateuszmikula.dev>
Date: Tue, 26 May 2026 18:58:39 +0200
Subject: [PATCH 8/8] Revert "Use Wild to link rustc (with LTO)"

This reverts commit 7fa990fdfa3ab7d41c9b109e65e9bc89d6f47037.
---
 src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile b/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
index b168c739c9793..f97277f02f0a0 100644
--- a/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
@@ -111,6 +111,8 @@ ENV LIBCURL_NO_PKG_CONFIG="1"
 
 ENV DIST_REQUIRE_ALL_TOOLS="1"
 
+ENV BUILDING_RUSTC 1
+
 # FIXME: Without this, LLVMgold.so incorrectly resolves to the system
 # libstdc++, instead of the one we build.
 ENV LD_PRELOAD=/rustroot/lib64/libstdc++.so.6