add script to build mobile library with host toolchain (#26440)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26440
As we are optimizing build size for Android/iOS, it starts diverging
from default build on several build options, e.g.:
- USE_STATIC_DISPATCH=ON;
- disable autograd;
- disable protobuf;
- no caffe2 ops;
- no torch/csrc/api;
...
Create this build_mobile.sh script to 'simulate' mobile build mode
with host toolchain so that people who don't work on mobile regularly
can debug Android/iOS CI error more easily. It might also be used to
build libtorch on devices like raspberry pi natively.
Test Plan:
- run scripts/build_mobile.sh -DBUILD_BINARY=ON
- run build_mobile/bin/speed_benchmark_torch on host machine
Differential Revision: D17466580
Pulled By: ljk53
fbshipit-source-id: 7abb6b50335af5b71e58fb6d6f9c38eb74bd5781
