fixing build issues on mac

[ritvikrao]

had to make a new pr to get rid of the ray commits; my original pr was made before ray was merged.

[adityapb]

Can you rename the commit and the PR to fixing build issues on mac

[ZwFink]

Pinging @mayantaylor for the new branch. We are hoping you can test this on your Apple Silicon machine

[mayantaylor]

Testing on arm (specifically an AppleM2 running Sonoma) produces the following error:

maya@genmaicha charm4py % python3 setup.py install ... clang -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk -Wno-error=implicit-function-declaration -arch arm8 -Icharm_src/charm/include -I/opt/homebrew/lib/python3.11/site-packages/numpy/core/include -I/opt/homebrew/opt/python@3.11/Frameworks/Python.framework/Versions/3.11/include/python3.11 -c charm4py/charmlib/charmlib_cython.c -o build/temp.macosx-14.0-arm64-cpython-311/charm4py/charmlib/charmlib_cython.o -g0 -O3

clang: error: invalid arch name '-arch arm8'

For context, I am running clang 15.0.0:
maya@genmaicha ray % clang --version
Apple clang version 15.0.0 (clang-1500.3.9.4)
Target: arm64-apple-darwin23.0.0

I can fix this problem with the following edit to setup.py...

def get_build_machine():
machine = platform.machine()
if machine == 'arm64' or machine == 'aarch64':
- return 'arm8'
+ return 'arm64'
return machine

... however, I don't know enough about clang to say for certain that this will work for all arm64/aarch64 machines (although I assume it will). I've pushed this change.

Everything else runs smoothly.