cmake: add example how to integrate cargo

1 files changed, 24 insertions, 0 deletions

diff --git a/content/2022-05-30-cmake-cargo-example/libcalc/build.rs b/content/2022-05-30-cmake-cargo-example/libcalc/build.rs
new file mode 100644
index 0000000..acfa6a7
--- /dev/null
+++ b/content/2022-05-30-cmake-cargo-example/libcalc/build.rs
@@ -0,0 +1,24 @@
+fn main() {
+    let crate_dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
+
+    let out_file = format!("{}/libcalc.h", std::env::var("LIBCALC_BUILD_DIR").unwrap_or(String::from(".")));
+
+    let cfg = cbindgen::Config {
+        cpp_compat: true,
+        ..Default::default()
+    };
+
+    if std::path::Path::new(&out_file).exists() {
+        std::fs::remove_file(&out_file).unwrap();
+    }
+
+    let ok = cbindgen::Builder::new()
+        .with_config(cfg)
+        .with_crate(crate_dir)
+        .with_language(cbindgen::Language::C)
+        .with_include_guard("LIBCALC_H")
+        .generate()
+        .expect("Unable to generate bindings")
+        .write_to_file(&out_file);
+    assert!(ok);
+}