Add --wrap-unsafe-ops option (#2354)

This reverts commit e8ffb42 and adds a new `--wrap-unsafe-ops` option as a workaround.

Author: pvdrz

.github/workflows/bindgen.yml

@@ -89,8 +89,6 @@ jobs:
 
       - name: Test expectations
         run: cd bindgen-tests/tests/expectations && cargo test
-        env:
-          RUSTFLAGS: "-D unsafe_op_in_unsafe_fn -D unused_unsafe"
 
   test:
     runs-on: ${{matrix.os}}

CHANGELOG.md

@@ -154,6 +154,8 @@
 ## Added
 
 ## Changed
+ * Only wrap unsafe operations in unsafe blocks if the `--wrap_unsafe_ops`
+   option is enabled.
 
  * Replace the `name: &str` argument for `ParseCallbacks::add_derives` by
    `info: DeriveInfo`.

bindgen-cli/options.rs

@@ -562,6 +562,9 @@ where
                 .value_name("override")
                 .multiple_occurrences(true)
                 .number_of_values(1),
+            Arg::new("wrap-unsafe-ops")
+                .long("wrap-unsafe-ops")
+                .help("Wrap unsafe operations in unsafe blocks."),
             Arg::new("V")
                 .long("version")
                 .help("Prints the version, and exits"),
@@ -1085,5 +1088,9 @@ where
         }
     }
 
+    if matches.is_present("wrap-unsafe-ops") {
+        builder = builder.wrap_unsafe_ops(true);
+    }
+
     Ok((builder, output, verbose))
 }