Build for macOS + m1 chips

[jrabary]

Hi all,
I'm not sure whether macOS is already supported. I'm trying to build on my laptop with m1 chips and got the following error

Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
clang++: warning: argument unused during compilation: '-msse' [-Wunused-command-line-argument]
clang++: warning: argument unused during compilation: '-msse2' [-Wunused-command-line-argument]
clang++: warning: argument unused during compilation: '-mmmx' [-Wunused-command-line-argument]
In file included from envpool/box2d/box2d_envpool.cc:15:
In file included from ./envpool/box2d/bipedal_walker.h:21:
In file included from ./envpool/core/async_envpool.h:30:
In file included from ./envpool/core/envpool.h:23:
In file included from ./envpool/core/env_spec.h:23:
./envpool/core/dict.h:58:23: warning: string literal operator templates are a GNU extension [-Wgnu-string-literal-operator-template]
inline constexpr auto operator""_() {  // NOLINT
                      ^
In file included from envpool/box2d/box2d_envpool.cc:15:
In file included from ./envpool/box2d/bipedal_walker.h:21:
./envpool/core/async_envpool.h:110:9: error: unknown type name 'cpu_set_t'
        cpu_set_t cpuset;
        ^
./envpool/core/async_envpool.h:114:70: error: use of undeclared identifier 'cpu_set_t'; did you mean 'cpuset'?
        pthread_setaffinity_np(workers_[tid].native_handle(), sizeof(cpu_set_t),
                                                                     ^~~~~~~~~
                                                                     cpuset
./envpool/core/async_envpool.h:110:19: note: 'cpuset' declared here
        cpu_set_t cpuset;
                  ^
In file included from envpool/box2d/box2d_envpool.cc:18:
In file included from ./envpool/core/py_envpool.h:33:
./envpool/core/xla.h:20:10: fatal error: 'cuda_runtime_api.h' file not found
#include <cuda_runtime_api.h>
         ^~~~~~~~~~~~~~~~~~~~
1 warning and 3 errors generated.
Error in child process '/usr/bin/xcrun'. 1
Target //:setup failed to build
Use --verbose_failures to see the command lines of failed build steps.

So two errors related to intel chips and Nvidia cuda.

Any ideas to fix this ?