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Summary: [Comment](https://github.com/pytorch/pytorch/pull/62445/files#r680132022) claims, it got added for consistency with top level CMakeLists.txt, but `-Wno-unused-variable` is not mentioned there. Modify violations in 50+ files that were added in the interim by either removing unused variables, or decorating the code with `C10_UNUSED` if local variable is likely used to extend object lifetime until the end of the block. Caused preventable revert in https://github.com/pytorch/pytorch/pull/72633#issuecomment-1092300787 Pull Request resolved: https://github.com/pytorch/pytorch/pull/75538 Reviewed By: anjali411 Differential Revision: D35747333 Pulled By: malfet fbshipit-source-id: 3fc5828e44a4c05ba0e89e92613e6ebbdb260626 (cherry picked from commit c179fba21cfa2a0093fad50ccad5a22dd7cff52c)