Arch Linux

Description:

As of glibc 2.33-4, `--enable-kernel` is set for compiler options.
This breaks several systems using older Linux kernel, notably WSL.

The commit message for 2.33-4 reads "enab(l)e compatibility with older (4.4+) kernels", but in fact this purged those systems.

From http://www.gnu.org/software/libc/manual/html_node/Configuring-and-compiling.html -

> ‘--enable-kernel=version’
> This option is currently only useful on GNU/Linux systems. The version parameter should have the form X.Y.Z and describes the smallest version of the Linux kernel the generated library is expected to support. The higher the version number is, the less compatibility code is added, and the faster the code gets.

Additional info:
* package version(s): glibc 2.33-4

Steps to reproduce:

This is how I confirmed the issue. You should be able to reproduce this issue on any environment using kernel 4.4.0 with any user-space executables dynamically linked to glibc.

1. Install Arch Linux on WSL1
2. pacman -Syu
3. w

Expected behaviour:
w should work normally.

Actual behaviour:
It shows `Fatal: kernel too old` error message.