Split monolithic raw crates into sys crates

Creating a crate for bwd-gc highlights the fact that it would be nice to
fix 2!

Fix #9

Author: Ericson2314

Cargo.lock

@@ -1,6 +1,11 @@
 [workspace]
 members = [
-    "nix-bindings-bindgen-raw",
+    "bdwgc-sys",
+    "nix-bindings-util-sys",
+    "nix-bindings-store-sys",
+    "nix-bindings-expr-sys",
+    "nix-bindings-fetchers-sys",
+    "nix-bindings-flake-sys",
     "nix-bindings-expr",
     "nix-bindings-fetchers",
     "nix-bindings-flake",

Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "nix-bindings-bindgen-raw"
+name = "bdwgc-sys"
 version = "0.1.0"
 edition = "2021"
 build = "build.rs"
@@ -8,6 +8,8 @@ license = "LGPL-2.1"
 [lib]
 path = "src/lib.rs"
 
+[dependencies]
+
 [build-dependencies]
 bindgen = "0.69"
 pkg-config = "0.3"

nix-bindings-bindgen-raw/Cargo.toml bdwgc-sys/Cargo.tomlnix-bindings-bindgen-raw/Cargo.toml renamed to bdwgc-sys/Cargo.toml

@@ -0,0 +1,4 @@
+# bdwgc-sys
+
+This crate contains generated bindings for the Boehm-Demers-Weiser garbage collector (`bdw-gc`).
+**You should not have to use this crate directly,** and so you should probably not add it to your dependencies.

bdwgc-sys/README.md

@@ -0,0 +1,27 @@
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    println!("cargo:rerun-if-changed=include/bdwgc.h");
+
+    let mut args = Vec::new();
+    for path in pkg_config::probe_library("bdw-gc")
+        .unwrap()
+        .include_paths
+        .iter()
+    {
+        args.push(format!("-I{}", path.to_str().unwrap()));
+    }
+
+    let bindings = bindgen::Builder::default()
+        .header("include/bdwgc.h")
+        .clang_args(args)
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
+        .generate()
+        .expect("Unable to generate bindings");
+
+    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+    bindings
+        .write_to_file(out_path.join("bindings.rs"))
+        .expect("Couldn't write bindings!");
+}

bdwgc-sys/build.rs

@@ -0,0 +1,2 @@
+#define GC_THREADS
+#include <gc/gc.h>

bdwgc-sys/include/bdwgc.h

@@ -0,0 +1,7 @@
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+#![allow(dead_code)]
+#![allow(clippy::all)]
+
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));