pytorch

91531d30 - [caffe2] add a CAFFE2_NODISCARD macro to help support old compilers (#53754)

[caffe2] add a CAFFE2_NODISCARD macro to help support old compilers (#53754) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/53754 Some of the PyTorch CircleCI builds still use gcc 5.4, and compile with `-Werror=attributes` causing this old compiler to fail because it does not understand the `[[nodiscard]]` attribute. Let's define a `CAFFE2_NODISCARD` macro to work around this. ghstack-source-id: 123594084 Test Plan: I'm using this macro in subsequent diffs in the stack. Reviewed By: mraway Differential Revision: D26959584 fbshipit-source-id: c7ba94f7ea944b6340e9fe20949ba41931e11d41