Generate possum.h as part of build

Needed to ensure C++ bindings aren't produced accidentally.

Author: anacrolix

Cargo.lock

@@ -68,6 +68,9 @@ test-log = "0.2.14"
 [target.'cfg(loom)'.dev-dependencies]
 loom = "0.7"
 
+[build-dependencies]
+cbindgen = "0.29.0"
+
 [features]
 default = []
 testing = ["dep:fdlimit", "dep:rayon", "dep:twox-hash"]

Cargo.toml

@@ -1,4 +1,14 @@
+use std::env;
+
 fn main() {
     // We have a custom "loom" cfg that Rust warns about since 1.80.
     println!("cargo::rustc-check-cfg=cfg(loom)");
+
+    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+
+    cbindgen::generate(crate_dir)
+        .expect("Unable to generate bindings")
+        // I expect there's a better place to put this, then copy it into the Go
+        // directory so it is packaged in the Go module.
+        .write_to_file("go/cpossum/possum.h");
 }

build.rs

@@ -1,16 +1,10 @@
 github.com/RoaringBitmap/roaring v0.4.7/go.mod h1:8khRDP4HmeXns4xIj9oGrKSz7XTQiJx2zgh7AcNke4w=
-github.com/anacrolix/chansync v0.5.1-0.20240710235309-042fd9527a94 h1:oz2dp9sWY1iFOxFRZh7azX0O81K7Jwb885jQDmIIOWE=
-github.com/anacrolix/chansync v0.5.1-0.20240710235309-042fd9527a94/go.mod h1:DZsatdsdXxD0WiwcGl0nJVwyjCKMDv+knl1q2iBjA2k=
 github.com/anacrolix/chansync v0.5.1 h1:j+R9DtotkXm40VFjZ8rJTSJkg2Gv1ldZt8kl96lyJJ0=
 github.com/anacrolix/chansync v0.5.1/go.mod h1:DZsatdsdXxD0WiwcGl0nJVwyjCKMDv+knl1q2iBjA2k=
 github.com/anacrolix/envpprof v0.0.0-20180404065416-323002cec2fa/go.mod h1:KgHhUaQMc8cC0+cEflSgCFNFbKwi5h54gqtVn8yhP7c=
 github.com/anacrolix/envpprof v1.0.0/go.mod h1:KgHhUaQMc8cC0+cEflSgCFNFbKwi5h54gqtVn8yhP7c=
 github.com/anacrolix/envpprof v1.1.0 h1:hz8QWMN1fA01YNQsUtVvl9hBXQWWMxSnHHoOK9IdrNY=
 github.com/anacrolix/envpprof v1.1.0/go.mod h1:My7T5oSqVfEn4MD4Meczkw/f5lSIndGAKu/0SM/rkf4=
-github.com/anacrolix/generics v0.0.0-20230911070922-5dd7545c6b13 h1:qwOprPTDMM3BASJRf84mmZnTXRsPGGJ8xoHKQS7m3so=
-github.com/anacrolix/generics v0.0.0-20230911070922-5dd7545c6b13/go.mod h1:ff2rHB/joTV03aMSSn/AZNnaIpUw0h3njetGsaXcMy8=
-github.com/anacrolix/generics v0.0.1 h1:4WVhK6iLb3UAAAQP6I3uYlMOHcp9FqJC9j4n81Wv9Ks=
-github.com/anacrolix/generics v0.0.1/go.mod h1:ff2rHB/joTV03aMSSn/AZNnaIpUw0h3njetGsaXcMy8=
 github.com/anacrolix/generics v0.0.2 h1:UbtD+KntUGxeGYMC4RwhsETieL9ixGdSptJQRhdy7No=
 github.com/anacrolix/generics v0.0.2/go.mod h1:ff2rHB/joTV03aMSSn/AZNnaIpUw0h3njetGsaXcMy8=
 github.com/anacrolix/log v0.6.0 h1:5y+wtTWoecbrAWWuoBCH7UuGFiD6q2jnQxrLK01RC+Q=