Refactor target_compile_options into torch_compile_options (#29730)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29730
Back in the day, Caffe2 had a good idea: instead of spattering
target_compile_options all over the codebase, define a helper
function which sets all the options for a target. This is especially
helpful if I want to split libtorch.so into libtorch_cpu.so
and libtorch_cuda.so; I need a way to easily apply options
to multiple targets. A shared helper function is just the ticket.
I moved every target_compile_options call in caffe2/CMakeLists.txt
that didn't seem target dependent (exclusions included OpenMP flags,
API-related macros, ONNX related macros and HIP flags) into
torch_compile_options. I slavishly preserved the structure:
there's a nearly redundant WERROR if() in the output but I preserved
it.
There is one thing I don't like about this, which is that now
the compile options are off in a random directory that no one would
expect. But c'est la vie...
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D18571166
Pulled By: ezyang
fbshipit-source-id: 21cd5f7663485077600782078fbb1787fab09035
