Initial commit

8 files changed, 95 insertions, 0 deletions

diff --git a/README.md b/README.md
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+++ b/README.md
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+Test repo to figure out cross compilation with carnix
+
+AFAICT individual packages are largely agnostic wrt. what they're being compiled for.
+nixpkgs-unstable has neat support for cross compilation without fancy flags:
+
+```
+  file $(nix-build --no-out-link '<nixpkgs>' -A pkgsCross.aarch64-multiplatform.hello)/bin/hello
+  /nix/store/6924zrj4fww7xs7qzxfidj5n7id6qngi-hello-2.10-aarch64-unknown-linux-gnu/bin/hello: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /nix/store/rcj93w6gk9l6w9jgmqx911iycs2ya9rg-glibc-2.27-aarch64-unknown-linux-gnu/lib/ld-linux-aarch64.so.1, for GNU/Linux 2.6.32, not stripped
+```
+
+There *is* a pkgsCross.musl64, but it seems to link musl dynamically, not sure what's up with that.
diff --git a/buildRustCrateHelpers.nix b/buildRustCrateHelpers.nix
new file mode 100644
index 0000000..3fdcb66
--- /dev/null
+++ b/buildRustCrateHelpers.nix
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+{ lib, buildPlatform }: {
+  kernel = buildPlatform.parsed.kernel.name;
+  abi = buildPlatform.parsed.abi.name;
+  include = includedFiles: src: builtins.filterSource (path: type:
+    lib.lists.any (f:
+      let p = toString (src + ("/" + f)); in
+      (path == p) || (type == "directory" && lib.strings.hasPrefix path p)
+    ) includedFiles
+  ) src;
+  updateFeatures = f: up: functions: builtins.deepSeq f (lib.lists.foldl' (features: fun: fun features) (lib.attrsets.recursiveUpdate f up) functions);
+  mapFeatures = features: map (fun: fun { features = features; });
+  mkFeatures = feat: lib.lists.foldl (features: featureName:
+    if feat.${featureName} or false then
+      [ featureName ] ++ features
+    else
+      features
+    ) [] (builtins.attrNames feat);
+}
diff --git a/default.nix b/default.nix
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index 0000000..76c11cf
--- /dev/null
+++ b/default.nix
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+let
+  overlay = self: super: rec {
+    buildRustCrateHelpers = self.callPackage ./buildRustCrateHelpers.nix {};
+
+    carnix-cross-test = self.callPackage hello/Cargo.nix {
+      cratesIO = self.callPackage hello/crates-io.nix { };
+    };
+
+    rustHello = carnix-cross-test.hello {};
+  };
+
+  nixpkgs = import (builtins.fetchTarball https://nixos.org/channels/nixos-unstable/nixexprs.tar.xz) {
+    overlays = [ overlay ];
+  };
+in {
+  inherit (nixpkgs.pkgsCross.aarch64-multiplatform)
+    hello
+    rustHello;
+}
diff --git a/hello/Cargo.lock b/hello/Cargo.lock
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+++ b/hello/Cargo.lock
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+[[package]]
+name = "hello"
+version = "0.1.0"
+
diff --git a/hello/Cargo.nix b/hello/Cargo.nix
new file mode 100644
index 0000000..4db6737
--- /dev/null
+++ b/hello/Cargo.nix
@@ -0,0 +1,26 @@
+# Generated by carnix 0.8.5: /home/till/.cargo/bin/carnix nix --src ./.
+{ lib, buildPlatform, buildRustCrate, buildRustCrateHelpers, cratesIO, fetchgit }:
+with buildRustCrateHelpers;
+let inherit (lib.lists) fold;
+    inherit (lib.attrsets) recursiveUpdate;
+in
+let crates = cratesIO // rec {
+  crates.hello."0.1.0" = deps: { features?(features_.hello."0.1.0" deps {}) }: buildRustCrate {
+    crateName = "hello";
+    version = "0.1.0";
+    authors = [ "till" ];
+    src = ./.;
+  };
+  features_.hello."0.1.0" = deps: f: updateFeatures f (rec {
+    hello."0.1.0".default = (f.hello."0.1.0".default or true);
+  }) [];
+
+
+
+}; in
+
+rec {
+  hello = crates.crates.hello."0.1.0" deps;
+  __all = [ (hello {}) ];
+  deps.hello."0.1.0" = {};
+}
diff --git a/hello/Cargo.toml b/hello/Cargo.toml
new file mode 100644
index 0000000..e968470
--- /dev/null
+++ b/hello/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "hello"
+version = "0.1.0"
+authors = ["till"]
+
+[dependencies]
diff --git a/hello/crates-io.nix b/hello/crates-io.nix
new file mode 100644
index 0000000..7a0e584
--- /dev/null
+++ b/hello/crates-io.nix
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+{ lib, buildRustCrate, buildRustCrateHelpers }:
+with buildRustCrateHelpers;
+let inherit (lib.lists) fold;
+    inherit (lib.attrsets) recursiveUpdate;
+in
+rec {
+
+}
diff --git a/hello/src/main.rs b/hello/src/main.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/hello/src/main.rs
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+fn main() {
+    println!("Hello, world!");
+}