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Commit 8639df65 authored by Jean-Paul Calderone's avatar Jean-Paul Calderone
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some notes and syntax error "fixes"

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flake.nix
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......@@ -211,43 +211,154 @@
nativeBuildInputs =
with pkgs; getBuildInputs (drv: drv.nativeBuildInputs) [ openssl libffi python39 ];
};
} // {
packages.aarch64-android.host-python310 = (pkgs.pkgsCross.aarch64-android.python310.override {
# Turn off all the things. Each one might be broken for
# cross-compilation and even if not we don't need them for this build
# Python. We just need it to report the right platform info.
mimetypesSupport = false;
x11Support = false;
bluezSupport = false;
sqlite = null;
openssl = null;
tzdata = null;
readline = null;
}).overrideAttrs (old: {
# Turn off even more things which aren't parameters to the Python
# expression.
# These drag in an aarch64-android bash which fails to build.
preFixup = null;
postPatch = null;
# This drags in a -lcrypt dependency which isn't satisfied by Google
# Android Bionic.
LIBS = null;
});
# packages.aarch64-android.zfec = self.packages.aarch64-android.host-python310.buildPythonPackage;
# let
# build-python = pkgs.pkgsCross.${system}.python310;
# host-python = pkgs.pkgsCross.aarch64-android.python310;
# build-pyenv = build-python.withPackages (ps: [ (ps.callPackage ./crossenv.nix) ]);
# in
# pkgs.mkDerivation {
# name = "python3.10-zfec";
# version = "2.3.4"; # XXX
# src = fetchPypi
# };
});
}) // {
# Python cross-compilation notes.
#
# You can get a lot of cross-compiled stuff out of nixpkgs beneath
# `pkgsCross`. For example,
#
# pkgsCross.aarch64-android.python3Minimal
#
# is just what the name says. This builds fine with only one small
# change against current nixpkgs. However, its extension modules have a
# harder time. For example,
#
# pkgsCross.aarch64-android.python3Minimal.pkgs.zfec
#
# fails to build because:
#
# running bdist_wheel
# Traceback (most recent call last):
# File "/build/wheel-0.37.1-source/nix_run_setup", line 8, in <module>
# exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\\r\\n', '\\n'), __file__, 'exec'))
# File "setup.py", line 4, in <module>
# setup(maintainer=u'Alex Grönholm')
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/__init__.py", line 87, in setup
# return distutils.core.setup(**attrs)
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/_distutils/core.py", line 185, in setup
# return run_commands(dist)
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/_distutils/core.py", line 201, in run_commands
# dist.run_commands()
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/_distutils/dist.py", line 973, in run_commands
# self.run_command(cmd)
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/dist.py", line 1217, in run_command
# super().run_command(command)
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/_distutils/dist.py", line 992, in run_command
# cmd_obj.run()
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/wheel/bdist_wheel.py", line 295, in run
# build_ext = self.reinitialize_command('build_ext')
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/__init__.py", line 200, in reinitialize_command
# cmd = _Command.reinitialize_command(self, command, reinit_subcommands)
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/_distutils/cmd.py", line 312, in reinitialize_command
# return self.distribution.reinitialize_command(command, reinit_subcommands)
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/_distutils/dist.py", line 945, in reinitialize_command
# command = self.get_command_obj(command_name)
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/_distutils/dist.py", line 864, in get_command_obj
# klass = self.get_command_class(command)
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/dist.py", line 954, in get_command_class
# self.cmdclass[command] = cmdclass = ep.load()
# File "/nix/store/537cvh8mqdaglc0an8ndmzszllh1lwac-python3-minimal-3.10.8/lib/python3.10/importlib/metadata/__init__.py", line 171, in load
# module = import_module(match.group('module'))
# File "/nix/store/537cvh8mqdaglc0an8ndmzszllh1lwac-python3-minimal-3.10.8/lib/python3.10/importlib/__init__.py", line 126, in import_module
# return _bootstrap._gcd_import(name[level:], package, level)
# File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
# File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
# File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
# File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
# File "<frozen importlib._bootstrap_external>", line 883, in exec_module
# File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/command/build_ext.py", line 26, in <module>
# get_config_var("LDSHARED")
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/_distutils/sysconfig.py", line 574, in get_config_var
# return get_config_vars().get(name)
# File "/nix/store/azdg3l16q2d03g8drgr94bg1069mfzpq-python3.10-bootstrapped-pip-22.2.2/lib/python3.10/site-packages/setuptools/_distutils/sysconfig.py", line 553, in get_config_vars
# _config_vars = sysconfig.get_config_vars().copy()
# File "/nix/store/537cvh8mqdaglc0an8ndmzszllh1lwac-python3-minimal-3.10.8/lib/python3.10/sysconfig.py", line 615, in get_config_vars
# _init_posix(_CONFIG_VARS)
# File "/nix/store/537cvh8mqdaglc0an8ndmzszllh1lwac-python3-minimal-3.10.8/lib/python3.10/sysconfig.py", line 477, in _init_posix
# _temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)
# ModuleNotFoundError: No module named '_sysconfigdata__linux_aarch64-linux-android'
#
# Notice that the *build* Python
# (537cvh8mqdaglc0an8ndmzszllh1lwac-python3-minimal-3.10.8) is trying to
# load sysconfigdata for the *host* Python - presumably so it can
# compile the extension correctly. However, the host Python
# sysconfigdata module appears to be unavailable to the build Python.
#
# Why? The nixpkgs CPython expression writes the sysconfigdata module
# for both Pythons (build and host). It has ``sysconfigdataHook`` that
# goes to a lot of trouble to compute the right parameters for the host
# Python and write the data to a properly named source file.
#
# However, the build Python and host Pythons each only get one of these
# modules. For the build Python it is:
#
# _sysconfigdata__linux_x86_64-linux-gnu.py
#
# and the host Python gets:
#
# _sysconfigdata__linux_.py
#
# Each of these contains information which is apparently correct for
# their respective runtime systems. Then, the nixpkgs CPython
# expression for building the extension module uses "bootstrap pip"
# which will respect PYTHONPATH for module search.
#
# (Q) Does something put the host Python's _sysconfigdata__linux_.py on
# the build Python's PYTHONPATH? What? How?
#
# (Q)
#
# And now for something completely different.
#
# https://crossenv.readthedocs.io/en/latest/ is a tool specifically for
# this. It assumes you can cross-compile CPython on your own, though,
# and then helps you use it to cross-compile extension modules. Maybe
# our nixpkgs-cross-compiled CPython would be a good complement?
#
# packages.host-python = pkgsCross.aarch64-android.python3Minimal.withPackages (ps: [
# # The nixpkgs zfec has some extra dependencies that we might not
# # really care about. This one is leaner. Mostly only relevant
# # because we have to cross-compile anything here.
# (ps.callPackage ./zfec.nix {})
# ]);
# packages.aarch64-android.host-python310 =
# let
# pkgs = import nixpkgs {
# system = "x86_64-linux";
# config = {
# allowUnfree = true;
# android_sdk.accept_license = true;
# };
# };
# in
# (pkgs.pkgsCross.aarch64-android.python310.override {
# # Turn off all the things. Each one might be broken for
# # cross-compilation and even if not we don't need them for this build
# # Python. We just need it to report the right platform info.
# mimetypesSupport = false;
# x11Support = false;
# bluezSupport = false;
# sqlite = null;
# openssl = null;
# tzdata = null;
# readline = null;
# }).overrideAttrs (old: {
# # Turn off even more things which aren't parameters to the Python
# # expressionThey .
# # These drag in an aarch64-android bash which fails to build.
# preFixup = null;
# postPatch = null;
# # This drags in a -lcrypt dependency which isn't satisfied by Google
# # Android Bionic.
# LIBS = null;
# });
};
}
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