Build fails due to /usr/bin/ccache being detected as Clang by build/build.py

[andportnoy]

Description

A workaround is to uninstall ccache.

JAX commit: cea36a0
Invocation:

python build/build.py \
       --use_clang \
       --enable_cuda \
       --cuda_compute_capabilities=8.9 \
       --bazel_options=--override_repository=xla=/home/aportnoy/Projects/xla \
       --bazel_options=--disk_cache=/home/aportnoy/bazel-cache \
       --bazel_options=--linkopt=-fuse-ld=lld \
       --bazel_options=--strip=never \
       --bazel_options=--cxxopt=-fno-omit-frame-pointer \
       --bazel_options=--cxxopt=-g \
       --cuda_path /usr/local/cuda \
       --cudnn_path /usr \
       --editable

Output:

Bazel binary path: /home/aportnoy/.local/bin/bazel
Bazel version: 6.1.0
Python binary path: /home/aportnoy/Projects/jax/venv/bin/python
Python version: 3.12
NumPy version: 1.26.4
Use clang: yes
clang path: /usr/bin/ccache
Traceback (most recent call last):
  File "/home/aportnoy/Projects/jax/build/build.py", line 713, in <module>
    main()
  File "/home/aportnoy/Projects/jax/build/build.py", line 610, in main
    clang_major_version = get_clang_major_version(clang_path)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/aportnoy/Projects/jax/build/build.py", line 246, in get_clang_major_version
    clang_version_proc = subprocess.run(
                         ^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.12/subprocess.py", line 571, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['/usr/bin/ccache', '-E', '-P', '-']' returned non-zero exit status 1.

System info (python version, jaxlib version, accelerator, etc.)

(jax) box:~/Projects/jax $ which clang
/usr/lib64/ccache/clang

(jax) box:~/Projects/jax $ ls -l $(which clang)
lrwxrwxrwx. 1 root root 16 Mar  9 11:13 /usr/lib64/ccache/clang -> ../../bin/ccache

(jax) box:~/Projects/jax $ python -c "import pathlib; print(pathlib.Path('$(which clang)').resolve())"
/usr/bin/ccache