[ET][Windows] Relax -Werror for ExecuTorch CPU kernels on the Windows host#20973
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… host Pull Request resolved: #20949 The arvr Windows clang toolchain enables a stricter `-Werror` warning set than the sanctioned ET build platforms, and vendored third-party headers that ExecuTorch does not own trip it. VMA's `vk_mem_alloc.h` hits `-Werror,-Winconsistent-missing-destructor-override`, and PyTorch's `ATen/cpu/vec/vec_base.h` uses `#if __GNUC__ <= 12` without `defined(__GNUC__)`, hitting `-Werror,-Wundef`. Because the offending code is in vendored headers we cannot patch, this disables warnings-as-errors for the affected compiles, scoped to `ovr_config//os:windows` only, so the clang target compiles are relaxed while the MSVC host tools and all non-Windows platforms are untouched. `backends/vulkan/targets.bzl` adds `-Wno-error` to the Vulkan targets (VMA header). The CPU-kernel build is split across four independent macros/targets, each of which includes the ATen vec headers and so needs the same relaxation: `kernels/portable/op_registration_util.bzl`, `kernels/optimized/op_registration_util.bzl`, the `binary_ops` support library in `kernels/optimized/cpu/targets.bzl`, and the `libblas` support library in `kernels/optimized/lib_defs.bzl`. ghstack-source-id: 402995445 @exported-using-ghexport Differential Revision: [D112012049](https://our.internmc.facebook.com/intern/diff/D112012049/)
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20973
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #20949 by @SS-JIA
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/SS-JIA/574/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/574/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/SS-JIA/573/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/574/orig
Differential Revision: D112012049
@diff-train-skip-merge