build fails on AArch64, Fedora 33

[LutzWeischerFujitsu]

[jw@cn06 jax]$ python3 build/build.py

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_ | |/ _ \ \ /
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___// /_/_\

Downloading bazel from: https://github.com/bazelbuild/bazel/releases/download/3.7.2/bazel-3.7.2-linux-x86_64
bazel-3.7.2-linux-x86_64 [########################################] 100%
Traceback (most recent call last):
File "/data/jw/jax/build/build.py", line 521, in
main()
File "/data/jw/jax/build/build.py", line 439, in main
bazel_path = get_bazel_path(args.bazel_path)
File "/data/jw/jax/build/build.py", line 165, in get_bazel_path
if check_bazel_version(path):
File "/data/jw/jax/build/build.py", line 174, in check_bazel_version
version_output = shell([bazel_path, "--bazelrc=/dev/null", "version"])
File "/data/jw/jax/build/build.py", line 51, in shell
output = subprocess.check_output(cmd)
File "/usr/lib64/python3.9/subprocess.py", line 420, in check_output
return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
File "/usr/lib64/python3.9/subprocess.py", line 501, in run
with Popen(*popenargs, **kwargs) as process:
File "/usr/lib64/python3.9/subprocess.py", line 947, in init
self._execute_child(args, executable, preexec_fn, close_fds,
File "/usr/lib64/python3.9/subprocess.py", line 1819, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
OSError: [Errno 8] Exec format error: './bazel-3.7.2-linux-x86_64'
[jw@cn06 jax]$

[hawkinsp]

The build script doesn't support aarch64 on Linux yet! But that's ok, we accept contributions.

I suspect we need to teach this logic about aarch64:
https://cs.opensource.google/jax/jax/+/master:build/build.py;drc=7b7a2a1ba83fec86f6fa6e4526a12c5e33f80ebb;l=81

Do you want to send a PR adding an Aarch64 case? (Another option is that we may be able to use something like Bazelisk instead of having our own "download bazel" logic.)

(I suspect once the build script is fixed, there's a pretty good chance that everything will work.)

[LutzWeischerFujitsu]

It's pretty common that build processes have unintentional "Intel-isms".
You, please, do a PR, I'll test it and keep on reporting issues. BTW, Bazel does work already.

[hawkinsp]

#6701 was my best guess at a fix. I don't have such a machine to test with, though. Please try it out!