Invalid Metal library on non-conda Mac env after cmp_tuple

[roelofvandijk]

Mac OS, Metal, M3 Macbook Pro, Python 3.12.4 in a venv.

I think 3929a9dc945e9c00684aa676241908550cf7b697 broke something on Metal, I am hitting an invalid library error on a non-conda environment. This was working a while ago, git bisect points to 3929a9dc945e9c00684aa676241908550cf7b697.

AssertionError: Invalid Metal library. Could be due to using conda. Try system python or METAL_XCODE=1 DISABLE_COMPILER_CACHE=1.

To reproduce (similar to https://github.com/tinygrad/tinygrad/issues/5241):

#!/usr/bin/env python3

from tinygrad import Tensor, dtypes
import numpy as np
def main():
        huge = Tensor(np.zeros((20000, 20000)), dtype=dtypes.int32)
        a = Tensor.arange(20000)
        b = Tensor.arange(20000)
        indexed = huge[a,b]
        print(indexed[0].sum().item())

if __name__ == "__main__":
    main()

This works on a9d6a6c339871d489d0db63746490142e6541d82 but fails with the library error on the next commit (3929a9dc945e9c00684aa676241908550cf7b697)

(.venv) ➜  tinygrad git:(a9d6a6c3) ✗ python t.py
Traceback (most recent call last):
  File "/Users/rvd/src/rvd/tinygrad/t.py", line 13, in <module>
    main()
  File "/Users/rvd/src/rvd/tinygrad/t.py", line 10, in main
    print(indexed[0].sum().item())
          ^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/rvd/src/rvd/tinygrad/tinygrad/tensor.py", line 271, in item
    return self._data().cast(self.dtype.fmt)[0]
           ^^^^^^^^^^^^
  File "/Users/rvd/src/rvd/tinygrad/tinygrad/tensor.py", line 242, in _data
    cpu = self.cast(self.dtype.scalar()).contiguous().to("CLANG").realize()
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/rvd/src/rvd/tinygrad/tinygrad/tensor.py", line 201, in realize
    run_schedule(*self.schedule_with_vars(*lst), do_update_stats=do_update_stats)
  File "/Users/rvd/src/rvd/tinygrad/tinygrad/engine/realize.py", line 190, in run_schedule
    for ei in lower_schedule(schedule):
  File "/Users/rvd/src/rvd/tinygrad/tinygrad/engine/realize.py", line 183, in lower_schedule
    while len(schedule): yield lower_schedule_item(schedule.pop(0))
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/rvd/src/rvd/tinygrad/tinygrad/engine/realize.py", line 169, in lower_schedule_item
    runner = get_runner(si.outputs[0].device, si.ast)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/rvd/src/rvd/tinygrad/tinygrad/engine/realize.py", line 142, in get_runner
    method_cache[ckey] = method_cache[bkey] = ret = CompiledRunner(replace(prg, dname=dname))
                                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/rvd/src/rvd/tinygrad/tinygrad/engine/realize.py", line 61, in __init__
    self.clprg = Device[p.dname].runtime(p.function_name, self.lib)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/rvd/src/rvd/tinygrad/tinygrad/runtime/ops_metal.py", line 39, in __init__
    assert lib[:4] == b"MTLB", "Invalid Metal library. Could be due to using conda. Try system python or METAL_XCODE=1 DISABLE_COMPILER_CACHE=1."
           ^^^^^^^^^^^^^^^^^^
AssertionError: Invalid Metal library. Could be due to using conda. Try system python or METAL_XCODE=1 DISABLE_COMPILER_CACHE=1.
``