Rollup merge of rust-lang#90001 - Fearyncess:master, r=alexcrichton

Make rlib metadata strip works with MIPSr6 architecture

Because MIPSr6 has many differences with previous MIPSr2 arch, the previous rlib metadata stripping code in `rustc_codegen_ssa` is only for MIPSr2/r3/r5 (which share the same elf e_flags).

This commit fixed this problem. It makes `rustc_codegen_ssa` happy when compiling rustc for MIPSr6 target or hosts.

e_flags REF: https://github.com/llvm/llvm-project/blob/e356027016c6365b3d8924f54c33e2c63d931492/llvm/include/llvm/BinaryFormat/ELF.h#L562

Cargo.lock

@@ -24,6 +24,17 @@ dependencies = [
  "rustc-std-workspace-core",
 ]
 
+[[package]]
+name = "ahash"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43bb833f0bf979d8475d38fbf09ed3b8a55e1885fe93ad3f93239fc6a4f17b98"
+dependencies = [
+ "getrandom 0.2.0",
+ "once_cell",
+ "version_check",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "0.7.18"
@@ -1579,6 +1590,7 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "362385356d610bd1e5a408ddf8d022041774b683f345a1d2cfcb4f60f8ae2db5"
 dependencies = [
+ "ahash",
  "compiler_builtins",
  "rustc-std-workspace-alloc",
  "rustc-std-workspace-core",
@@ -2396,8 +2408,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "39f37e50073ccad23b6d09bcb5b263f4e76d3bb6038e4a3c08e52162ffa8abc2"
 dependencies = [
  "compiler_builtins",
- "crc32fast",
- "indexmap",
  "memchr",
  "rustc-std-workspace-alloc",
  "rustc-std-workspace-core",
@@ -2415,6 +2425,18 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "object"
+version = "0.28.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ce8b38d41f9f3618fc23f908faae61510f8d8ce2d99cbe910641e8f1971f084"
+dependencies = [
+ "crc32fast",
+ "hashbrown",
+ "indexmap",
+ "memchr",
+]
+
 [[package]]
 name = "odht"
 version = "0.3.1"
@@ -3801,7 +3823,7 @@ dependencies = [
  "itertools 0.9.0",
  "jobserver",
  "libc",
- "object 0.26.2",
+ "object 0.28.1",
  "pathdiff",
  "regex",
  "rustc_apfloat",

compiler/rustc_codegen_ssa/Cargo.toml

@@ -41,6 +41,6 @@ rustc_target = { path = "../rustc_target" }
 rustc_session = { path = "../rustc_session" }
 
 [dependencies.object]
-version = "0.26.2"
+version = "0.28.0"
 default-features = false
 features = ["read_core", "elf", "macho", "pe", "unaligned", "archive", "write"]

compiler/rustc_codegen_ssa/src/back/metadata.rs

@@ -95,7 +95,7 @@ fn search_for_metadata<'a>(
         .map_err(|e| format!("failed to read {} section in '{}': {}", section, path.display(), e))
 }
 
-fn create_object_file(sess: &Session) -> Option<write::Object> {
+fn create_object_file(sess: &Session) -> Option<write::Object<'static>> {
     let endianness = match sess.target.options.endian {
         Endian::Little => Endianness::Little,
         Endian::Big => Endianness::Big,
@@ -135,12 +135,24 @@ fn create_object_file(sess: &Session) -> Option<write::Object> {
         Architecture::Mips => {
             // copied from `mipsel-linux-gnu-gcc foo.c -c` and
             // inspecting the resulting `e_flags` field.
-            let e_flags = elf::EF_MIPS_ARCH_32R2 | elf::EF_MIPS_CPIC | elf::EF_MIPS_PIC;
+            let e_flags = elf::EF_MIPS_CPIC
+                | elf::EF_MIPS_PIC
+                | if sess.target.options.cpu.contains("r6") {
+                    elf::EF_MIPS_ARCH_32R6 | elf::EF_MIPS_NAN2008
+                } else {
+                    elf::EF_MIPS_ARCH_32R2
+                };
             file.flags = FileFlags::Elf { e_flags };
         }
         Architecture::Mips64 => {
             // copied from `mips64el-linux-gnuabi64-gcc foo.c -c`
-            let e_flags = elf::EF_MIPS_ARCH_64R2 | elf::EF_MIPS_CPIC | elf::EF_MIPS_PIC;
+            let e_flags = elf::EF_MIPS_CPIC
+                | elf::EF_MIPS_PIC
+                | if sess.target.options.cpu.contains("r6") {
+                    elf::EF_MIPS_ARCH_64R6 | elf::EF_MIPS_NAN2008
+                } else {
+                    elf::EF_MIPS_ARCH_64R2
+                };
             file.flags = FileFlags::Elf { e_flags };
         }
         Architecture::Riscv64 if sess.target.options.features.contains("+d") => {

src/tools/tidy/src/deps.rs

@@ -73,6 +73,7 @@ const RESTRICTED_DEPENDENCY_CRATES: &[&str] = &["rustc_driver", "rustc_codegen_l
 const PERMITTED_DEPENDENCIES: &[&str] = &[
     "addr2line",
     "adler",
+    "ahash",
     "aho-corasick",
     "annotate-snippets",
     "ansi_term",