rust-lang · cuviper · Aug 4, 2026 · Aug 9, 2026 · Mark-Simulacrum · Aug 8, 2026
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/compiler/rustc_codegen_gcc/Cargo.lock b/compiler/rustc_codegen_gcc/Cargo.lock
@@ -145,9 +145,9 @@ dependencies = [
 
 [[package]]
 name = "object"
-version = "0.37.1"
+version = "0.39.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03fd943161069e1768b4b3d050890ba48730e590f57e56d4aa04e7e090e61b4a"
+checksum = "2e5a6c098c7a3b6547378093f5cc30bc54fd361ce711e05293a5cc589562739b"
 dependencies = [
  "memchr",
 ]

diff --git a/compiler/rustc_codegen_gcc/Cargo.toml b/compiler/rustc_codegen_gcc/Cargo.toml
@@ -18,7 +18,7 @@ master = ["gccjit/master"]
 default = ["master"]
 
 [dependencies]
-object = { version = "0.37.0", default-features = false, features = ["std", "read"] }
+object = { version = "0.39.0", default-features = false, features = ["std", "read"] }
 tempfile = "3.20"
 gccjit = { version = "3.3.0", features = ["dlopen"] }
 #gccjit = { git = "https://github.com/rust-lang/gccjit.rs", branch = "error-dlopen", features = ["dlopen"] }

diff --git a/compiler/rustc_codegen_llvm/Cargo.toml b/compiler/rustc_codegen_llvm/Cargo.toml
@@ -11,12 +11,12 @@ test = false
 bitflags = "2.4.1"
 # To avoid duplicate dependencies, this should match the version of gimli used
 # by `rustc_codegen_ssa` via its `thorin-dwp` dependency.
-gimli = "0.33"
+gimli = "0.34"
 itertools = "0.15"
 libc = "0.2"
 libloading = { version = "0.9.0" }
 measureme = "12.0.1"
-object = { version = "0.38.1", default-features = false, features = ["std", "read"] }
+object = { version = "0.39.1", default-features = false, features = ["std", "read"] }
 rustc-demangle = "0.1.28"
 rustc_abi = { path = "../rustc_abi" }
 rustc_ast = { path = "../rustc_ast" }

diff --git a/compiler/rustc_codegen_ssa/Cargo.toml b/compiler/rustc_codegen_ssa/Cargo.toml
@@ -37,9 +37,9 @@ rustc_trait_selection = { path = "../rustc_trait_selection" }
 serde_json = "1.0.59"
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 tempfile = "3.2"
-thorin-dwp = "0.10"
+thorin-dwp = "0.11"
 tracing = "0.1"
-wasm-encoder = "0.219"
+wasm-encoder = "0.247"
 # tidy-alphabetical-end
 
 [target.'cfg(unix)'.dependencies]
@@ -48,7 +48,7 @@ libc = "0.2.50"
 # tidy-alphabetical-end
 
 [dependencies.object]
-version = "0.38.1"
+version = "0.39.1"
 default-features = false
 features = ["read_core", "elf", "macho", "pe", "xcoff", "unaligned", "archive", "write", "wasm"]
 

diff --git a/compiler/rustc_codegen_ssa/src/back/link/raw_dylib.rs b/compiler/rustc_codegen_ssa/src/back/link/raw_dylib.rs
@@ -477,13 +477,13 @@ fn create_elf_raw_dylib_stub(sess: &Session, soname: &str, symbols: &[DllImport]
     // the DT_SONAME will be used by the linker to populate DT_NEEDED
     // which the loader uses to find the library.
     stub.write_align_dynamic();
-    stub.write_dynamic_string(elf::DT_SONAME, soname);
+    stub.write_dynamic_string(elf::DT_SONAME, soname).unwrap();
     // LSB section "2.7. Symbol Versioning" requires `DT_VERDEFNUM` to be reliable.
     if verdef_count > 1 {
-        stub.write_dynamic(elf::DT_VERDEFNUM, verdef_count as u64);
+        stub.write_dynamic(elf::DT_VERDEFNUM, verdef_count as u64).unwrap();
     }
     // DT_NULL terminates the .dynamic table.
-    stub.write_dynamic(elf::DT_NULL, 0);
+    stub.write_dynamic(elf::DT_NULL, 0).unwrap();
 
     stub_buf
 }
diff --git a/compiler/rustc_metadata/Cargo.toml b/compiler/rustc_metadata/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2024"
 [dependencies]
 # tidy-alphabetical-start
 bitflags = "2.4.1"
-libloading = "0.8.0"
+libloading = "0.9.0"
 odht = { version = "0.3.1", features = ["nightly"] }
 rustc_abi = { path = "../rustc_abi" }
 rustc_ast = { path = "../rustc_ast" }

diff --git a/compiler/rustc_metadata/src/host_dylib.rs b/compiler/rustc_metadata/src/host_dylib.rs
@@ -33,7 +33,7 @@ fn attempt_load_dylib(path: &Path) -> Result<libloading::Library, libloading::Er
             .map(|lib| lib.into());
     }
 
-    unsafe { libloading::Library::new(&path) }
+    unsafe { libloading::Library::new(path) }
 }
 
 // On Windows the compiler would sometimes intermittently fail to open the

diff --git a/compiler/rustc_target/Cargo.toml b/compiler/rustc_target/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2024"
 # tidy-alphabetical-start
 arrayvec = { version = "0.7", default-features = false }
 bitflags = "2.4.1"
-object = { version = "0.38.1", default-features = false, features = ["elf", "macho"] }
+object = { version = "0.39.1", default-features = false, features = ["elf", "macho"] }
 rustc_abi = { path = "../rustc_abi" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_error_messages = { path = "../rustc_error_messages" }

diff --git a/src/bootstrap/Cargo.lock b/src/bootstrap/Cargo.lock
@@ -491,9 +491,9 @@ 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 = [
  "memchr",
 ]

diff --git a/src/bootstrap/Cargo.toml b/src/bootstrap/Cargo.toml
@@ -42,7 +42,7 @@ clap_complete = "4.4"
 home = "0.5"
 ignore = "0.4"
 libc = "0.2"
-object = { version = "0.38.1", default-features = false, features = ["archive", "coff", "read_core", "std", "unaligned"] }
+object = { version = "0.39.1", default-features = false, features = ["archive", "coff", "read_core", "std", "unaligned"] }
 opener = "0.8"
 semver = "1.0"
 serde = "1.0"

diff --git a/src/bootstrap/src/utils/proc_macro_deps.rs b/src/bootstrap/src/utils/proc_macro_deps.rs
@@ -3,11 +3,10 @@
 /// See <https://github.com/rust-lang/rust/issues/134863>
 pub static CRATES: &[&str] = &[
     // tidy-alphabetical-start
-    "anyhow",
+    "allocator_api2",
     "askama_derive",
     "askama_parser",
     "basic_toml",
-    "bitflags",
     "block_buffer",
     "bumpalo",
     "cfg_if",
@@ -27,32 +26,24 @@ pub static CRATES: &[&str] = &[
     "glob",
     "hashbrown",
     "heck",
-    "id_arena",
     "ident_case",
     "indexmap",
     "intl_memoizer",
     "intl_pluralrules",
-    "itoa",
-    "leb128fmt",
     "libc",
-    "log",
     "memchr",
     "minimal_lexical",
     "nom",
     "pest",
     "pest_generator",
     "pest_meta",
-    "prettyplease",
     "proc_macro2",
     "quote",
     "rustc_hash",
-    "ryu",
     "self_cell",
-    "semver",
     "serde",
     "serde_core",
     "serde_derive_internals",
-    "serde_json",
     "sha2",
     "smallvec",
     "stable_deref_trait",
@@ -68,18 +59,10 @@ pub static CRATES: &[&str] = &[
     "unic_langid_impl",
     "unic_langid_macros",
     "unicode_ident",
-    "unicode_xid",
     "version_check",
     "wasm_bindgen_macro_support",
     "wasm_bindgen_shared",
-    "wasm_encoder",
-    "wasm_metadata",
-    "wasmparser",
     "winnow",
-    "wit_bindgen_core",
-    "wit_bindgen_rust",
-    "wit_component",
-    "wit_parser",
     "yoke",
     "zerofrom",
     "zerovec",

diff --git a/src/tools/run-make-support/Cargo.toml b/src/tools/run-make-support/Cargo.toml
@@ -11,14 +11,14 @@ edition = "2024"
 
 # tidy-alphabetical-start
 bstr = "1.12"
-gimli = "0.33"
+gimli = "0.34"
 libc = "0.2"
-object = { version = "0.38.1", features = ["wasm"] }
+object = { version = "0.39.1", features = ["wasm"] }
 regex = "1.11"
 serde_json = "1.0"
 similar = "2.7"
 tempfile = "3"
-wasmparser = { version = "0.243", default-features = false, features = ["std", "features", "validate"] }
+wasmparser = { version = "0.247", default-features = false, features = ["std", "features", "validate"] }
 # tidy-alphabetical-end
 
 # Shared with bootstrap and compiletest

diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
@@ -370,7 +370,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "jiff-tzdb-platform",
     "jobserver",
     "lazy_static",
-    "leb128",
+    "leb128fmt",
     "libc",
     "libloading",
     "linux-raw-sys",
@@ -432,6 +432,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "scoped-tls",
     "scopeguard",
     "self_cell",
+    "semver",
     "serde",
     "serde_core",
     "serde_derive",

diff --git a/tests/run-make/wasm-import-module/rmake.rs b/tests/run-make/wasm-import-module/rmake.rs
@@ -15,8 +15,8 @@ fn main() {
     for payload in wasmparser::Parser::new(0).parse_all(&file) {
         let payload = payload.unwrap();
         if let wasmparser::Payload::ImportSection(s) = payload {
-            for i in s {
-                let i = i.unwrap();
+            for i in s.into_iter().flat_map(Result::unwrap) {
+                let (_, i) = i.unwrap();
                 imports.entry(i.module).or_insert(Vec::new()).push((i.name, i.ty));
             }
         }

diff --git a/tests/run-make/wasm-spurious-import/rmake.rs b/tests/run-make/wasm-spurious-import/rmake.rs
@@ -20,8 +20,8 @@ fn main() {
     for payload in wasmparser::Parser::new(0).parse_all(&file) {
         let payload = payload.unwrap();
         if let wasmparser::Payload::ImportSection(s) = payload {
-            for i in s {
-                let i = i.unwrap();
+            for i in s.into_iter().flat_map(Result::unwrap) {
+                let (_, i) = i.unwrap();
                 imports.entry(i.module).or_insert(Vec::new()).push((i.name, i.ty));
             }
         }

diff --git a/tests/run-make/wasm-symbols-different-module/rmake.rs b/tests/run-make/wasm-symbols-different-module/rmake.rs
@@ -30,8 +30,8 @@ fn test(file: &str, args: &[&str], expected_imports: &[(&str, &[&str])]) {
     for payload in wasmparser::Parser::new(0).parse_all(&file) {
         let payload = payload.unwrap();
         if let wasmparser::Payload::ImportSection(s) = payload {
-            for i in s {
-                let i = i.unwrap();
+            for i in s.into_iter().flat_map(Result::unwrap) {
+                let (_, i) = i.unwrap();
                 imports.entry(i.module).or_insert(HashSet::new()).insert(i.name);
             }
         }

diff --git a/tests/ui/codegen/duplicated-path-in-error.gnu.stderr b/tests/ui/codegen/duplicated-path-in-error.gnu.stderr
@@ -1,2 +1,2 @@
-error: couldn't load codegen backend /non-existing-one.so: cannot open shared object file: No such file or directory
+error: couldn't load codegen backend /non-existing-one.so: dlopen failed: /non-existing-one.so: cannot open shared object file: No such file or directory
Original file line number	Diff line number	Diff line change
		@@ -1,2 +1,2 @@
		error: couldn't load codegen backend /non-existing-one.so: cannot open shared object file: No such file or directory
		error: couldn't load codegen backend /non-existing-one.so: dlopen failed: /non-existing-one.so: cannot open shared object file: No such file or directory