Example warning:

```
In file included from macios/appex-deduplicate-frameworks/macios/runtime/runtime.m:98:
macios/runtime/delegates.inc:189:41: error: missing field 'register_assembly' initializer [-Werror,-Wmissing-field-initializers]
  189 | static struct Delegates delegates = { 0 };
      |                                         ^
```

References:

* https://developer.apple.com/documentation/xcode/enabling-enhanced-security-for-your-app
* https://releases.llvm.org/8.0.0/tools/clang/docs/ReleaseNotes.html#major-new-features (for -ftrivial-auto-var-init=zero)

Contributes towards #23023.

…atch (#24072)

Example warning:

```
macios/runtime/trampolines.m:1784:9: error: cast from 'void *(*)(MonoObject *, void *, GCHandle *)' (aka 'void *(*)(_MonoObject *, void *, void **)') to 'xamarin_managed_to_id_func' (aka 'id (*)(_MonoObject *, void *, void **)') converts to incompatible function type [-Werror,-Wcast-function-type-mismatch]
 1784 |         return (xamarin_managed_to_id_func) xamarin_smart_enum_to_nsstring;
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

References:

* https://developer.apple.com/documentation/xcode/enabling-enhanced-security-for-your-app
* https://releases.llvm.org/8.0.0/tools/clang/docs/ReleaseNotes.html#major-new-features (for -ftrivial-auto-var-init=zero)

Contributes towards #23023.

…-body

Example warning:

```
macios/runtime/shared.m:50:106: error: semicolon before method body is ignored [-Werror,-Wsemicolon-before-method-body]
   50 | -(id) initWithData: (void *) targ selector:(SEL) sel argument:(id) arg is_direct_binding:(bool) is_direct;
      |                                                                                                          ^
```

References:

* https://developer.apple.com/documentation/xcode/enabling-enhanced-security-for-your-app
* https://releases.llvm.org/8.0.0/tools/clang/docs/ReleaseNotes.html#major-new-features (for -ftrivial-auto-var-init=zero)

Contributes towards #23023.

Example warning:

```
macios/runtime/trampolines-arm64.m:214:21: error: comparison of integers of different signs: 'int' and 'size_t' (aka 'unsigned long') [-Werror,-Wsign-compare]
  214 |                 for (int i = 1; i < struct_length; i++)
      |                                 ~ ^ ~~~~~~~~~~~~~
```

References:

* https://developer.apple.com/documentation/xcode/enabling-enhanced-security-for-your-app
* https://releases.llvm.org/8.0.0/tools/clang/docs/ReleaseNotes.html#major-new-features (for -ftrivial-auto-var-init=zero)

Contributes towards #23023.

This will zero-initialize all automatic (stack and register based) variables.

References:

* https://developer.apple.com/documentation/xcode/enabling-enhanced-security-for-your-app
* https://releases.llvm.org/8.0.0/tools/clang/docs/ReleaseNotes.html#major-new-features (for -ftrivial-auto-var-init=zero)

Contributes towards #23023.

Example warning:

```
macios/runtime/trampolines-invoke.m:212:15: error: declaration shadows a local variable [-Werror,-Wshadow]
  212 |                 const char *type = xamarin_skip_encoding_flags (argType);
      |                             ^
```

References:

* https://developer.apple.com/documentation/xcode/enabling-enhanced-security-for-your-app
* https://releases.llvm.org/8.0.0/tools/clang/docs/ReleaseNotes.html#major-new-features (for -ftrivial-auto-var-init=zero)

Contributes towards #23023.

Example warning:

```objc
nsstring-localization.m:33:46: error: format string is not a string literal [-Werror,-Wformat-nonliteral]
   33 |         return [NSString localizedStringWithFormat: format, a];
      |                                                     ^~~~~~
```

References:

* https://developer.apple.com/documentation/xcode/enabling-enhanced-security-for-your-app
* https://releases.llvm.org/8.0.0/tools/clang/docs/ReleaseNotes.html#major-new-features (for -ftrivial-auto-var-init=zero)

Contributes towards #23023.

…rnings

None of these warnings trigger in our code base at the moment.

References:

* https://developer.apple.com/documentation/xcode/enabling-enhanced-security-for-your-app
* https://releases.llvm.org/8.0.0/tools/clang/docs/ReleaseNotes.html#major-new-features (for -ftrivial-auto-var-init=zero)

Contributes towards #23023.