A module with python version 3.7 is used, but the minimum required python version is 3.6

[songdongsheng]

Testing fails in RHEL 8：

stderr:
Traceback (most recent call last):
  File "/opt/llvm-build/llvm-18.x/libcxx/test/libcxx/module_std.gen.py", line 24, in <module>
    from libcxx.test.modules import module_test_generator
  File "/opt/llvm-build/llvm-18.x/rc2/llvm-project/libcxx/utils/libcxx/test/modules.py", line 11, in <module>
    from dataclasses import dataclass
ModuleNotFoundError: No module named 'dataclasses'

This is because the default python in RHEL 8 is 3.6, and this test uses the new modules in python 3.7.

The easiest fix is to upgrade the python version requirement to 3.7 or higher and modify the page Getting Started with the LLVM System.

[tru]

@linux4life798 has been working on the python version bump. Guess it didn't land before 18.x?

[h-vetinari]

Yeah, it's "just" a doc issue, see this RFC - Python 3.6 is EOL (and so is 3.7 actually). It's wasted effort to maintain compatibility with these dead versions, especially because getting a newer Python is not that hard (e.g. through conda). RHEL 8 even provides an "official" Python3.8 in the Software Collections.

[ldionne]

Closing since we don't support Python 3.6 anymore.