Deprecate (buildPythonPackage { ... }).override for Python packages in
favour of overridePythonAttrs.
This change does not affect the override interface of most Python
packages, as the override interface is provided by callPackage and
shadows the locally defined override attribute.
In preparation for the deprecation of `stdenv.isX`.
These shorthands are not conducive to cross-compilation because they
hide the platforms.
Darwin might get cross-compilation for which the continued usage of `stdenv.isDarwin` will get in the way
One example of why this is bad and especially affects compiler packages
https://www.github.com/NixOS/nixpkgs/pull/343059
There are too many files to go through manually but a treewide should
get users thinking when they see a `hostPlatform.isX` in a place where it
doesn't make sense.
```
fd --type f "\.nix" | xargs sd --fixed-strings "stdenv.is" "stdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "stdenv'.is" "stdenv'.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "clangStdenv.is" "clangStdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "gccStdenv.is" "gccStdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "stdenvNoCC.is" "stdenvNoCC.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "inherit (stdenv) is" "inherit (stdenv.hostPlatform) is"
fd --type f "\.nix" | xargs sd --fixed-strings "buildStdenv.is" "buildStdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "effectiveStdenv.is" "effectiveStdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "originalStdenv.is" "originalStdenv.hostPlatform.is"
```
We don't need the sysconfigdata name at eval time, so trying to
reimplement platform_triplet.c in Nix is unnecessarily painful
compared to just getting it from the build system after the fact.
Always specify the postPhases attribute as a list instead of a string.
Append elements to the postPhases Bash variable using appendToVar
instead of string or Bash array concatenation.
Always specify the preDistPhases attribute as a list instead of a string.
Append elements to the preDistPhases Bash variable using appendToVar
instead of string or Bash array concatenation.
Handle element insertion before a specific element using string
substitution as before, but handle both structured and unstructured
attributes.
Always specify the preInstallPhases attribute as a list instead of a
string.
Append elements to the preInstallPhases Bash variable using appendToVar
instead of string or Bash array concatenation.
Checking if bluez is a derivation requires evaluating whether an
emulator is available (in the case that gobject-introspection is
available), which when cross compiling requires evaluating qemu, which
requires evaluating libxml2, which requires evaluating Python.
The recursion break happens in the Python expression because it's the
thing behaving unusually, by forcing evaluation of all of its
arguments, even ones that are optional and unused.
Fixes: 8b3a4a617e ("bluez: fix when gobject-introspection unsupported")
