This adds -frandom-seed to each compiler invocation in stdenv. The
object here is to make the compierl invocations produce the same output
every time they are called (for the same derivation). When the
-frandom-seed option is not set the compiler will use a combination of
random numbers (in GCC's case from /dev/urandom) and the durrent time to
produce a "random" input per file. This can (among other things) lead to
different ordering of symbols in the produced object files.

For reason of reproducibility we prefer having the same derivation
produce the exact same outputs. This is not a silver bullet but one way
to tame the compiler.

Sensitive to exact parser output

This reverts commit 0fc5e60.

For some reason the v1.0.3 PyPI tarball ships with tests that expect pytest-testmon master instead of the v1.0.3 code (tarpas/pytest-testmon#158), causing these tests to fail against 1.0.3 itself.

stdenv: introduce -frandom-seed

linuxHeaders: 5.5 -> 5.9.8

See https://www.redhat.com/sysadmin/fedora-31-control-group-v2 for
details on why this is desirable, and how it impacts containers.

Users that need to keep using the old cgroup hierarchy can re-enable it
by setting `systemd.unifiedCgroupHierarchy` to `false`.

Well-known candidates not supporting that hierarchy, like docker and
hidepid=… will disable it automatically.

Fixes #73800

This gets automatically disabled by docker if the docker backend is
used, but the bundled containerd also doesn't seem to support cgroupsv2,
so disable it explicitly here, too.

For now, testing IO Accounting is skipped, as it seems to be either
broken, or hard to reproduce in a VM.

Release notes: https://www.postgresql.org/docs/9.5/release-9-5-24.html

Release notes: https://www.postgresql.org/docs/9.6/release-9-6-20.html

Release notes: https://www.postgresql.org/docs/10/release-10-15.html

Release notes: https://www.postgresql.org/docs/11/release-11-10.html

Release notes: https://www.postgresql.org/docs/12/release-12-5.html

Release notes: https://www.postgresql.org/docs/13/release-13-1.html

Please do not use tarballs.nixos.org in src URLs.  tarballs.nixos.org is
a cache, not an authority.

This patch differs from the one in tarballs.nixos.org only in source code
comments.

Hack until we fix PYTHONPATH.

…ling extension modules"""

This still does not function without issues. E.g., bootstrapped-pip fails with Python 3.6 and 3.7
as well as 3.8 on 32-bit.

Because this is a stdenv-rebuild it needs to be tested significantly better

This reverts commit 6100bc2.

…isting