Rollup of 15 pull requests

[JonathanBrouwer]

Successful merges:

• sparc: make ABI consistent with clang #160401 (sparc: make ABI consistent with clang)
• Add Natvis visualiser and debuginfo tests for f128 #161777 (Add Natvis visualiser and debuginfo tests for f128)
• Rename the src install build step to rust-src. #162423 (Rename the src install build step to rust-src.)
• stdarch subtree update #162740 (stdarch subtree update)
• link Enzyme and the offload with in-tree lld if possible #162824 (link Enzyme and the offload with in-tree lld if possible)
• add Div and Mul for Complex<{float}> #162832 (add Div and Mul for Complex<{float}>)
• fix: unfulfilled nested dead code lint #161005 (fix: unfulfilled nested dead code lint)
• Fix docs of make_ascii_lowercase/make_ascii_upercase #161803 (Fix docs of make_ascii_lowercase/make_ascii_upercase)
• Add mentions to sync back RELEASES.md to the main branch #162256 (Add mentions to sync back RELEASES.md to the main branch)
• simplify Target::GenericParam #162661 (simplify Target::GenericParam)
• Tidy footnote in platform-support.md #162666 (Tidy footnote in platform-support.md)
• docs(num): add documentation for NonZero::from_str #162803 (docs(num): add documentation for NonZero::from_str)
• Move more rustdoc-html tests in the right location #162906 (Move more rustdoc-html tests in the right location)
• An assortment of polonius tweaks #162922 (An assortment of polonius tweaks)
• Use niche length type for strlen to guarantee isize::MAX bound #162930 (Use niche length type for strlen to guarantee isize::MAX bound)

r? @ghost

Create a similar rollup

[JonathanBrouwer]

@bors r+ p=5

Trying commonly failed jobs
@bors try jobs=dist-various-1,test-various,test-x86_64-gnu-aux,test-x86_64-gnu-llvm-21-3,test-x86_64-msvc-1,test-aarch64-apple-1,test-aarch64-apple-2,test-x86_64-mingw-1,test-i686-msvc,test-armhf-gnu

[rust-bors]

📌 Commit eae88ac has been approved by JonathanBrouwer

It is now in the queue for this repository.

[rust-log-analyzer]

The job test-x86_64-msvc-2 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

---- num::complex::div stderr ----

thread 'main' (1156) panicked at coretests\tests\num\complex.rs:110:5:
assertion `left == right` failed
  left: Complex { re: 0.12, im: 5.75 }
 right: Complex { re: 3.0, im: 4.0 }
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::panicking::assert_failed_inner
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

---- num::complex::complex_multiplication stdout ----
---- num::complex::complex_multiplication stderr ----

thread 'main' (2716) panicked at coretests\tests\num\complex.rs:88:5:
assertion `left == right` failed
  left: Complex { re: -inf, im: 0.0 }
 right: Complex { re: inf, im: inf }
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::panicking::assert_failed_inner
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
---
    num::complex::div

test result: FAILED. 2780 passed; 2 failed; 6 ignored; 0 measured; 0 filtered out; finished in 9.52s

error: test failed, to rerun pass `-p coretests --test coretests`
"D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage0\\bin\\cargo.exe" "test" "--manifest-path" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2-codegen\\cg_clif\\build\\sysroot_tests\\Cargo.toml" "--target-dir" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2-codegen\\cg_clif\\build\\sysroot_tests_target" "--locked" "--target" "x86_64-pc-windows-msvc" "-p" "coretests" "-p" "alloctests" "--tests" "--" "-q" exited with status ExitStatus(ExitStatus(101))
error: process didn't exit successfully: `D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage3-codegen\x86_64-pc-windows-msvc\release\y.exe test --download-dir 'D:\a\rust\rust\build\cg_clif_download' --out-dir 'D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-codegen\cg_clif' --no-unstable-features --use-backend cranelift --sysroot llvm --skip-test testsuite.extended_sysroot` (exit code: 1)
Command `D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage0\bin\cargo.exe run --target x86_64-pc-windows-msvc -Zbinary-dep-depinfo -j 4 -Zroot-dir=D:\a\rust\rust -Zembed-metadata=no --locked --color=always --profile=release --manifest-path D:\a\rust\rust\compiler/rustc_codegen_cranelift/build_system/Cargo.toml -- test --download-dir D:\a\rust\rust\build\cg_clif_download --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-codegen\cg_clif --no-unstable-features --use-backend cranelift --sysroot llvm --skip-test testsuite.extended_sysroot [workdir=D:\a\rust\rust\compiler/rustc_codegen_cranelift]` failed with exit code 1
Created at: src\bootstrap\src\core\build_steps\test.rs:4407:25
Executed at: src\bootstrap\src\core\build_steps\test.rs:4451:26

Command has failed. Rerun with -v to see more details.
Bootstrap failed while executing `test --stage 2 --skip=tests --skip=library --skip=tidyselftest`
Currently active steps:
test::CodegenCranelift { compilers: RustcPrivateCompilers { build_compiler: Compiler { stage: 1, host: x86_64-pc-windows-msvc, forced_compiler: false }, target_compiler: Compiler { stage: 2, host: x86_64-pc-windows-msvc, forced_compiler: false } }, target: x86_64-pc-windows-msvc } at src\bootstrap\src\core\build_steps\test.rs:4393
Build completed unsuccessfully in 1:08:20
make: *** [Makefile:117: ci-msvc-ps1] Error 1
  local time: Fri Sep 18 11:10:33 CUT 2026
  network time: Fri, 18 Sep 2026 11:10:34 GMT
##[error]Process completed with exit code 2.
##[group]Run echo "disk usage:"
echo "disk usage:"

[rust-bors]

💔 Test for 0e43331 failed: CI. Failed job:

• auto - test-x86_64-msvc-2 (web logs, enhanced plaintext logs)

[rust-bors]

PR #162832, which is a member of this rollup, was unapproved.

[rust-bors]

☀️ Try build successful (CI)
Build commit: cd47fa1 (cd47fa1cd01157615ed47662fb486c41616ca9dd)
Base parent: 498b89d (498b89dd40af107a23c13a009345a0dea224248c)