Focus CI on the latest ROCm and amdclang

[derobins]

hipObject will be built with the latest ROCm's amdclang in rocm-systems and TheRock, so CI now builds with that unless a job exists to try something else. Every CI build uses ROCm 10.1.0, apart from the hardware tests, whose guests run ROCm 10.0, and the nightly packages.

The Build workflow's jobs are listed one by one rather than made by crossing axes. All of them use HIPOBJ_WERROR:

• Core jobs, amdclang on Ubuntu 26.04: RelWithDebInfo; Debug with HIPOBJ_USE_SANITIZERS; RelWithDebInfo with HIPOBJ_USE_THREAD_SANITIZER, as TheRock's TSan builds are; and Debug with code coverage.
• Smoke tests with amdclang: a static Release build (TheRock builds only shared libraries, and Release is its default), both NIC backends off, C++23, and C++26.
• Upstream Clang 21, and GCC 15 with and without HIPOBJ_USE_SANITIZERS, for the problems amdclang misses.
• Ubuntu 24.04's GCC 13 and Clang 18, with its CMake 3.28.

Other workflows:

• The nightly builds its packages with each ROCm version's amdclang.
• clang-tidy, IWYU, and the MinIO integration check use the Ubuntu 26.04 and ROCm 10.1.0 image. clang-tidy stays at LLVM 23, the newest release on apt.llvm.org, since ROCm 10.1's LLVM 24 only has snapshots there.
• IWYU, the MinIO integration check, the hardware tests, and ci/ernic/run-local.sh build with amdclang. run-local.sh sets the compiler on the cmake command line, so a build directory left from an earlier run with GCC is reconfigured.

IWYU parses with the clang it was built with (Clang 19 on Ubuntu 26.04), which rejects flags newer than itself, such as amdclang's -fno-strict-bool. HIPOBJIWYU.cmake now reads that clang's version, and a Clang build with HIPOBJ_USE_IWYU uses only the flags both compilers have, hardening flags included. Builds without HIPOBJ_USE_IWYU are unchanged. iwyu-wrapper.sh passes a lone --version straight to IWYU, without recording it as a run.

applyVendorQpAttrs()'s attr parameter is [[maybe_unused]], since nothing uses it when HIPOBJ_BNXT and HIPOBJ_IONIC are both off, which made HIPOBJ_WERROR fail the build.

AGENTS.md, docs/building.rst, and CHANGELOG.md describe the new CI coverage, the nightly's compiler, and what HIPOBJ_USE_IWYU leaves out.

[Copilot]

🔵 Needs a closer look

The compiler and image migrations, packaging changes, and IWYU flag adjustments need target-environment validation and final human review.

No open issues 🎉

What changed in this PR

Aligns hipObject CI with the amdclang-based builds planned for rocm-systems and TheRock.

Changes:

• Replaces the build matrix with explicit core and compatibility jobs, primarily using ROCm 10.1.0.
• Moves additional workflows and local hardware builds to amdclang.
• Adapts IWYU compiler flags, fixes backend-disabled warning handling, and updates documentation.

File	Description
src/​rdma/​transport.cpp	Marks the conditionally unused parameter.
docs/​building.rst	Documents IWYU restrictions and nightly compilers.
cmake/​HIPOBJIWYU.cmake	Detects IWYU’s Clang version.
cmake/​HIPOBJCompilerOptions.cmake	Limits IWYU builds to compatible flags.
ci/​iwyu/​iwyu-wrapper.sh	Forwards version queries without logging.
ci/​ernic/​run-local.sh	Explicitly selects amdclang during configuration.
CHANGELOG.md	Records nightly and IWYU changes.
AGENTS.md	Updates CI and tooling guidance.
.github/​workflows/​hipobject-nightly.yml	Selects each ROCm version’s amdclang.
.github/​workflows/​hipobject-minio-integration-check.yml	Updates the image and selects amdclang.
.github/​workflows/​hipobject-iwyu.yml	Updates the image and selects amdclang.
.github/​workflows/​hipobject-hardware-test-two-vm-protocol.yml	Selects amdclang for protocol builds.
.github/​workflows/​hipobject-hardware-test-two-vm-gpu-direct.yml	Selects amdclang for two-VM GPU builds.
.github/​workflows/​hipobject-hardware-test-s3-backend.yml	Selects amdclang for S3 backend builds.
.github/​workflows/​hipobject-hardware-test-minio-bridge.yml	Selects amdclang for bridge builds.
.github/​workflows/​hipobject-hardware-test-gpu-direct.yml	Selects amdclang for GPU-direct builds.
.github/​workflows/​hipobject-clang-tidy.yml	Updates the image while retaining LLVM 23 tooling.
.github/​workflows/​hipobject-build.yml	Defines explicit compiler and configuration coverage.

_{Review effort: Balanced}

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