[TrapsterDK]

Part of #11966.

Changed

• tools/testing/hermetic/consumers/cpp_rust/cc_rs/: root cargo workspace (root.Cargo.toml, root.Cargo.lock) and a crate rust/tests/fixtures/cc-rs that depends on libz-sys 1.1.31 (static, C through cc-rs) and cxx 1.0.205 (C++ through cc-rs). rust_test calls zlib crc32/zlibVersion and a CxxString.
• tools/testing/hermetic/BUILD.bazel: the cpp_rust qualification copies those files and adds //rust/tests/fixtures/cc-rs/... to its patterns. dx init then writes the cargo.from_cargo hub with the build-script cc annotation (adopt: dx init writes the build-script cc annotation with the cargo hub (part of #11966) #12307).
• tools/testing/hermetic/defs.bzl, compilers.bzl, BUILD.bazel: C-only msvc fixtures and consumers want the cl C Rich header entry msvc 260.<build> (261 is C++), and c_msvc_fixture/c_fixture_msvc expect the pinned cl's C1083: Cannot open include file: 'string' for cxx_in_c.c. Main fails the same way (run 43533929381); every producer in the binary comes from the pinned msvc_runtime and SDK libraries.
• root.Cargo.lock from bazel run @rules_rust//tools/upstream_wrapper:cargo -- generate-lockfile.

Tests

• bazel test //tools/testing/hermetic:hermetic_unit_test :c_gcc_fixture_test :cpp_gcc_fixture_test :c_llvm_fixture_test and build of :cpp_rust_manifest, :c_fixture_msvc_manifest: pass.
• Evidence windows_x86_64 //tools/testing/hermetic/...: green, run 43534848344 (c_msvc_fixture_test passes; manual qualifications not included).
• Evidence windows_x86_64 //tools/testing/hermetic:cpp_rust: red, run 43535197490. The consumer's @rules_dx//dx:generate_check fails analysis: gazelle/julia/BUILD.bazel sets package_name on julia_binary/julia_test, which only the root-only patches/rules_julia:package_name.patch adds (consumer-setup: rules_cuda, rules_python, rules_go, rules_julia, protobuf and lua patches upstream or root only (part of #11387) #11418, julia: bump rules_julia to the release with package_name and drop package_name.patch #6659).
• Evidence windows_x86_64 //tools/testing/hermetic:c_fixture_msvc: red, run 43535210349. @dx_msvc//:cc_toolchain_x64_x64_files references @windows_sdk//:winsdk_bin_x64, which only the root-only windows_support patches declare (consumer-setup: llvm, windows_support and hermetic_launcher patches upstream or into rules_dx code (part of #11387) #11416).
• tools/dx check --affected: timed out at 1200 s, not checked.
• Not run locally: the cpp_rust consumer qualification (nested Bazel); CI runs it.

Remaining

• :cpp_rust and :c_fixture_msvc on Windows: blocked by consumer-setup: rules_cuda, rules_python, rules_go, rules_julia, protobuf and lua patches upstream or root only (part of #11387) #11418 (rules_julia package_name) and consumer-setup: llvm, windows_support and hermetic_launcher patches upstream or into rules_dx code (part of #11387) #11416 (windows_support winsdk_bin_x64); rerun both once those land.
• analysis (PR-time checks on linux_x86_64) fails in //haskell/private/tools/weeder:weeder_build_test (no matching toolchain), outside this diff.
• linux_x86_64 to linux_arm64 cross build of //rust/tests/fixtures/cc-rs/... in the consumer: no cross qualification exists for cpp_rust yet.
• On Windows, rules_dx's own hub needs msvc_lib as AR_* for libz-sys (MODULE.bazel); a consumer hub may need the same from the public annotation.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Xut2hygW8NyPkC1Ea1mT4L

[TrapsterDK]

Evidence dispatched: windows_x86_64, test, //tools/testing/hermetic:cpp_rust, run 43516091977. Stays draft until green.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Xut2hws3L7Tg4oUvpSvuYD

[TrapsterDK]

Merge train: dropped and returned to draft, //tools/testing/hermetic:c_msvc_fixture_test failed on windows_x86_64 in run 43527640040 (rejected_source_fails_with_the_compiler_message, executables_name_the_selected_compiler) and no failing run on main shows it is pre-existing; the PR also edits tools/testing/hermetic/BUILD.bazel

🤖 Generated with Claude Code

https://claude.ai/code/session_01Xut2hws3L7Tg4oUvpSvuYD

[TrapsterDK]

Fixed: nothing to fix in this PR's files. Rebased onto current main (clean, no code changes, so no review is stale); hermetic_unit_test passes locally. The windows c_msvc_fixture_test failure (run 43527640040) is in files this PR does not touch: the starter binary links CRT objects from several MSVC versions (producers msvc 147.30729 to 261.35403, wanted msvc 261.35728) and the rejected-source log shows C1083 instead of STL1003. It cannot be reproduced on linux, and no main run covers //tools/testing/hermetic on windows, so it is not shown pre-existing. Left as draft; :cpp_rust windows result is still unconfirmed.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Xut2hws3L7Tg4oUvpSvuYD

[TrapsterDK]

Blocked, left draft: Windows :cpp_rust needs open PR #12641 (gazelle/julia without the root-only rules_julia package_name patch, #11418); Windows :c_fixture_msvc needs #11416 (@windows_sdk//:winsdk_bin_x64 declared outside the root-only windows_support patch, no PR yet). Branch also conflicts with main; rebase once those land.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Xut2hvuiHK9vSNJZWiqKfX