build: initial linux x86_64 support

bb.edn: addition of the linux shared library extension
build.rs: linux is case sensitive

README.md

@@ -12,12 +12,21 @@ probably not ready for you yet.
 
 Requires Clojure, babashka, GraalVM version 22.3.1, and Rust.
 
+### MacOS
 If you are using a recent version of MacOS, have all the deps
 installed, and are a relatively lucky person, it might be as easy as
 doing this from the top-level of this project's directory structure
 (making sure that the Java on your path is the GraalVM version
 mentioned above):
 
+### Linux x86_64 (using Nix Flakes)
+The `flakes.nix` file contains the necessary instructions for a
+repeatable build environment on Linux x86_64.
+``` shell
+$ nix develop
+```
+
+### Common
 ``` shell
 $ bb all
 ```

bb.edn

@@ -1,7 +1,7 @@
 {:tasks
  {:requires ([babashka.fs :as fs])
  :init (do
- (def libsci (str (first (fs/glob "clj" "LibScimacs.{dylib,dll,solib}"))))
+ (def libsci (str (first (fs/glob "clj" "LibScimacs.{dylib,dll,solib,so}"))))
  (def lib-ext (fs/extension libsci))
  (def local-lib (str "scimacs." lib-ext))
  (def uberjar "clj/target/uber.jar"))

build.rs

@@ -7,7 +7,7 @@ fn main() {
  let path = "./clj"; // where to find the GraalVM-generated stuff
 
  println!("cargo:rustc-link-search=./clj");
- println!("cargo:rustc-link-lib=Scimacs");
+ println!("cargo:rustc-link-lib=scimacs");
 
  println!("cargo:rustc-link-search={path}", path = path);
 

flake.nix

@@ -0,0 +1,29 @@
+{
+ inputs = {
+ nixpkgs.url = "github:nixos/nixpkgs";
+ rust-overlay.url = "github:oxalica/rust-overlay";
+ };
+
+ outputs = { self, nixpkgs, rust-overlay }:
+ let
+ system = "x86_64-linux";
+ pkgs = import nixpkgs {
+ inherit system;
+ overlays = [rust-overlay.overlays.default];
+ };
+ toolchain = pkgs.rust-bin.fromRustupToolchainFile ./toolchain.toml;
+ in {
+ devShells.${system}.default = pkgs.mkShell {
+ packages = [
+ toolchain
+ pkgs.babashka
+ pkgs.clojure
+ pkgs.graalvm-ce
+ pkgs.llvmPackages.libclang
+ pkgs.rust-analyzer-unwrapped
+ ];
+ RUST_SRC_PATH = "${toolchain}/lib/rustlib/src/rust/library";
+ LIBCLANG_PATH = "${pkgs.llvmPackages.libclang.lib}/lib";
+ };
+ };
+}

toolchain.toml

@@ -0,0 +1,5 @@
+# toolchain.toml
+[toolchain]
+channel = "nightly"
+components = [ "rustfmt", "rust-src" ]
+profile = "minimal"