From 6a3697e85fbd4787bd025b7fbb14356a505576ba Mon Sep 17 00:00:00 2001
From: Jean-Paul Calderone <exarkun@twistedmatrix.com>
Date: Tue, 6 Dec 2022 05:41:57 -0500
Subject: [PATCH] update notes
---
Notes.rst | 36 ++++++++++++++++++++++++++++++++++++
crossenv/flake.nix | 33 +++++++++++++++++++++++++++++++++
2 files changed, 69 insertions(+)
create mode 100644 crossenv/flake.nix
diff --git a/Notes.rst b/Notes.rst
index 0a315c2..7d27d8b 100644
--- a/Notes.rst
+++ b/Notes.rst
@@ -4,6 +4,29 @@
* Build an app that can read magic-folders and download linked files
+ * Build libchallenge_bypass_ristretto for armv7a and aarch64 Android
+
+ * nixpkgs *used to* use "crates-io.nix" which was quite friendly to cross-compilation!
+
+ But it got thrown in the trash and now you are directed to naersk or crate2nix.
+
+ * cross-compilation with crate2nix expressions is not straightforward
+
+ Does it work at all, for anything?
+ Who knows.
+ There's a ticket open.
+ I haven't yet figured out how to make it go.
+
+ * naersk looks super easy to use!
+
+ But does it support cross-compilation?
+ It is not clear.
+ (Naive?) Attempts to do so on nixpkgs master@HEAD fail with infinite recursion errors.
+ On nixos-22.05 with some patches applied ... maybe it will work?
+ (As of 2022-12-05 16:04, build is still running)
+
+ * Either way we need to preserve our postInstall step to get the .h and .pc files
+
* Build an app that runs a Haskell Tahoe-LAFS implementation on Android
* Reflex-FRP / Obsidian Systems Obelisk?
@@ -180,8 +203,21 @@
(by inspection with builtins.trace)
* python-cryptography
+
+ * cffi-based projects seem to be tricky!
+
* python-challenge-bypass-ristretto
+ * crossenv can do it!
+ See crossenv subdirectory.
+
+ * However, crossenv can't do python-challenge-bypass-ristretto
+ or python-cryptography.
+
+ These seem to have cffi as a build-time dependency.
+ Cross-env gives the build pip env the host cffi .so so it fails.
+
+
* Integrate a Python Tahoe-LAFS runtime with a GUI
* Build a GUI
diff --git a/crossenv/flake.nix b/crossenv/flake.nix
new file mode 100644
index 0000000..7179373
--- /dev/null
+++ b/crossenv/flake.nix
@@ -0,0 +1,33 @@
+{
+ inputs.nixpkgs.url = "github:NixOS/nixpkgs?rev=3d58e3a31ee55554fe26650bb59db7d6d0e97625";
+ outputs = { self, nixpkgs }:
+ let
+ native-pkgs = import nixpkgs {
+ system = "x86_64-linux";
+ allowUnfree = true;
+ android_sdk.accept_license = true;
+ };
+ cross-pkgs = native-pkgs.pkgsCross.aarch64-android;
+
+ platformVersion = "31";
+ cmakeVersion = "3.10.2";
+ buildToolsVersion = "31.0.0";
+ # Check out pkgs/development/mobile/androidenv/repo.json for
+ # nixpkgs-supported versions.
+ ndkVersion = "23.0.7123448-rc1";
+ androidComposition = native-pkgs.callPackage ../android.nix {
+ inherit cmakeVersion buildToolsVersion platformVersion ndkVersion;
+ };
+
+ in {
+ devShells.x86_64-linux.default = native-pkgs.mkShell rec {
+ BUILD_PYTHON = "${native-pkgs.python3Minimal}/bin/python";
+ HOST_PYTHON = "${cross-pkgs.python3Minimal}/bin/python";
+ ANDROIDSDK = "${androidComposition.androidsdk}/libexec/android-sdk";
+ ANDROIDNDK = "${ANDROIDSDK}/ndk-bundle";
+ shellHook = ''
+ export PATH="$(echo "$ANDROIDSDK/cmake/${cmakeVersion}".*/bin):$PATH"
+ '';
+ };
+ };
+}
--
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