…15245) ### What does this PR try to resolve? GitHub Runner Images 20250224.5.0+ ship Windows 11 SDK 10.0.26100+ compared to the previous Windows 11 SDK 10.0.22621, which bumped the UCRT headers. The new UCRT headers use SSE2 types. However, `cc` versions <= 1.2.15 emit `/arch:IA32` for `x86` Windows targets for `clang-cl`, which causes compilation errors since `clang-cl` can't find SSE2 types without `/arch:SSE2` specified (or defaulted). (Note that MSVC at the time of writing silently accepts and emits instruments for code using SSE2 types, as opposed to `clang-cl` hard error-ing). `cc` 1.2.16 contains a fix for this problem, rust-lang/cc-rs#1425, to correctly emit `/arch:SSE2` instead of `/arch:IA32` to enable `clang-cl` to find the SSE2 types. However, cargo's `cc` currently is still on 1.2.13. To fix this for rust-lang/rust CI, we need to bump anything that transitively relies on `cc` and tries to use `clang-cl` on `x86` Windows targets to compile any C/C++ code that transitively use functions or types that require SSE2 types, such as `<wchar.h>`. ### How should we test and review this PR? The fix was initially intended for `rustc_{codegen_ssa,llvm}` `cc`, and based on testing in rust-lang/rust#137724, I was able to successfully build `rustc_{codegen_ssa,llvm}` with a forked `cc` based on 1.2.15 which contains the fix from rust-lang/cc-rs#1425. Note that in the same PR, while the compiler build succeeded, the build of cargo itself failed since it transitively used a `cc` *without* the fix to build `curl-sys`[^dep-chain], which failed as one might expect (`curl-sys` tries to build C code that uses `<wchar.h>` which runs into the same problem). Hence, this PR is opened to bump cargo's `cc` to a `cc` version containing the fix. ### Additional information This `x86` Windows CI problem is: - Discussed in https://rust-lang.zulipchat.com/#narrow/channel/242791-t-infra/topic/spurious.20.28.3F.29.20i686.20msvc.20errors. - Tracked by rust-lang/rust#137733. #### `cc` changelog between 1.2.13 and 1.2.16 <details> <summary>`cc` changes since 1.2.13 up to and including 1.2.16</summary> ##### [1.2.16](rust-lang/cc-rs@cc-v1.2.15...cc-v1.2.16) - 2025-02-28 ###### Fixed - force windows compiler to run in `out_dir` to prevent artifacts in cwd (#1415) ###### Other - use `/arch:SSE2` for `x86` target arch (#1425) - Regenerate windows-sys binding ([#1422](rust-lang/cc-rs#1422)) - Regenerate target info ([#1418](rust-lang/cc-rs#1418)) - Add LIB var when compiling flag_check (#1417) - Change flag ordering ([#1403](rust-lang/cc-rs#1403)) - Fix archiver detection for musl cross compilation ([#1404](rust-lang/cc-rs#1404)) ##### [1.2.15](rust-lang/cc-rs@cc-v1.2.14...cc-v1.2.15) - 2025-02-21 ###### Other - Regenerate target info ([#1406](rust-lang/cc-rs#1406)) - Always read from all `CFLAGS`-style flags ([#1401](rust-lang/cc-rs#1401)) - Simplify the error output on failed `Command` invocation ([#1397](rust-lang/cc-rs#1397)) ##### [1.2.14](rust-lang/cc-rs@cc-v1.2.13...cc-v1.2.14) - 2025-02-14 ###### Other - Regenerate target info ([#1398](rust-lang/cc-rs#1398)) - Add support for setting `-gdwarf-{version}` based on RUSTFLAGS ([#1395](rust-lang/cc-rs#1395)) - Add support for alternative network stack io-sock on QNX 7.1 aarch64 and x86_64 ([#1312](rust-lang/cc-rs#1312)) </details> [^dep-chain]: I think the dep chain is something like git2 -> libgit2-sys -> curl -> curl-sys?

Generated .gitignore should only ignore top-level target directory #1415

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