Don't generate bindings as part of the build phase

Signed-off-by: Victor Porof <victor.porof@gmail.com>

lmdb-sys/Cargo.toml

@@ -13,6 +13,8 @@ documentation = "https://docs.rs/lmdb-rkv-sys"
 keywords = ["LMDB", "database", "storage-engine", "bindings", "library"]
 categories = ["database", "external-ffi-bindings"]
 
+# NB: When generating bindings, change to "bindgen.rs" or use something
+# like `cargo-script` instead.
 build = "build.rs"
 
 [dependencies]

lmdb-sys/bindgen.rs

@@ -0,0 +1,68 @@
+extern crate bindgen;
+
+use bindgen::callbacks::IntKind;
+use bindgen::callbacks::ParseCallbacks;
+use std::env;
+use std::path::PathBuf;
+
+#[derive(Debug)]
+struct Callbacks;
+
+impl ParseCallbacks for Callbacks {
+    fn int_macro(&self, name: &str, _value: i64) -> Option<IntKind> {
+        match name {
+            "MDB_SUCCESS"
+            | "MDB_KEYEXIST"
+            | "MDB_NOTFOUND"
+            | "MDB_PAGE_NOTFOUND"
+            | "MDB_CORRUPTED"
+            | "MDB_PANIC"
+            | "MDB_VERSION_MISMATCH"
+            | "MDB_INVALID"
+            | "MDB_MAP_FULL"
+            | "MDB_DBS_FULL"
+            | "MDB_READERS_FULL"
+            | "MDB_TLS_FULL"
+            | "MDB_TXN_FULL"
+            | "MDB_CURSOR_FULL"
+            | "MDB_PAGE_FULL"
+            | "MDB_MAP_RESIZED"
+            | "MDB_INCOMPATIBLE"
+            | "MDB_BAD_RSLOT"
+            | "MDB_BAD_TXN"
+            | "MDB_BAD_VALSIZE"
+            | "MDB_BAD_DBI"
+            | "MDB_LAST_ERRCODE" => Some(IntKind::Int),
+            _ => Some(IntKind::UInt),
+        }
+    }
+}
+
+fn main() {
+    let mut lmdb = PathBuf::from(&env::var("CARGO_MANIFEST_DIR").unwrap());
+    lmdb.push("lmdb");
+    lmdb.push("libraries");
+    lmdb.push("liblmdb");
+
+    let mut out_path = PathBuf::from(&env::var("CARGO_MANIFEST_DIR").unwrap());
+    out_path.push("src");
+
+    let bindings = bindgen::Builder::default()
+        .header(lmdb.join("lmdb.h").to_string_lossy())
+        .whitelist_var("^(MDB|mdb)_.*")
+        .whitelist_type("^(MDB|mdb)_.*")
+        .whitelist_function("^(MDB|mdb)_.*")
+        .ctypes_prefix("::libc")
+        .blacklist_item("mode_t")
+        .blacklist_item("^__.*")
+        .parse_callbacks(Box::new(Callbacks {}))
+        .layout_tests(false)
+        .prepend_enum_name(false)
+        .rustfmt_bindings(true)
+        .generate()
+        .expect("Unable to generate bindings");
+
+    bindings
+        .write_to_file(out_path.join("bindings.rs"))
+        .expect("Couldn't write bindings!");
+}

lmdb-sys/build.rs

@@ -1,9 +1,6 @@
-extern crate bindgen;
 extern crate cc;
 extern crate pkg_config;
 
-use bindgen::callbacks::IntKind;
-use bindgen::callbacks::ParseCallbacks;
 use std::env;
 use std::path::PathBuf;
 
@@ -35,39 +32,6 @@ const MDB_IDL_LOGN: u8 = 15;
 )))]
 const MDB_IDL_LOGN: u8 = 16;
 
-#[derive(Debug)]
-struct Callbacks;
-
-impl ParseCallbacks for Callbacks {
-    fn int_macro(&self, name: &str, _value: i64) -> Option<IntKind> {
-        match name {
-            "MDB_SUCCESS"
-            | "MDB_KEYEXIST"
-            | "MDB_NOTFOUND"
-            | "MDB_PAGE_NOTFOUND"
-            | "MDB_CORRUPTED"
-            | "MDB_PANIC"
-            | "MDB_VERSION_MISMATCH"
-            | "MDB_INVALID"
-            | "MDB_MAP_FULL"
-            | "MDB_DBS_FULL"
-            | "MDB_READERS_FULL"
-            | "MDB_TLS_FULL"
-            | "MDB_TXN_FULL"
-            | "MDB_CURSOR_FULL"
-            | "MDB_PAGE_FULL"
-            | "MDB_MAP_RESIZED"
-            | "MDB_INCOMPATIBLE"
-            | "MDB_BAD_RSLOT"
-            | "MDB_BAD_TXN"
-            | "MDB_BAD_VALSIZE"
-            | "MDB_BAD_DBI"
-            | "MDB_LAST_ERRCODE" => Some(IntKind::Int),
-            _ => Some(IntKind::UInt),
-        }
-    }
-}
-
 fn main() {
     let mut lmdb = PathBuf::from(&env::var("CARGO_MANIFEST_DIR").unwrap());
     lmdb.push("lmdb");
@@ -82,24 +46,4 @@ fn main() {
             .flag_if_supported("-Wno-unused-parameter")
             .compile("liblmdb.a")
     }
-
-    let bindings = bindgen::Builder::default()
-        .header(lmdb.join("lmdb.h").to_string_lossy())
-        .whitelist_var("^(MDB|mdb)_.*")
-        .whitelist_type("^(MDB|mdb)_.*")
-        .whitelist_function("^(MDB|mdb)_.*")
-        .ctypes_prefix("::libc")
-        .blacklist_item("mode_t")
-        .blacklist_item("^__.*")
-        .parse_callbacks(Box::new(Callbacks {}))
-        .layout_tests(false)
-        .prepend_enum_name(false)
-        .rustfmt_bindings(true)
-        .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!");
 }

lmdb-sys/src/lib.rs

@@ -11,4 +11,4 @@ pub type mode_t = ::libc::mode_t;
 #[allow(non_camel_case_types)]
 pub type mode_t = ::libc::c_int;
 
-include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+include!("bindings.rs");