Deny a subset of warnings instead of all in the generated lib.rs

This change decreases the chance of Rust build failures when SVD
files have strange formatting for types. The changelog has also
been updated.

Author: mvertescher

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - Enum items now associated with values (C-style), enums annotated with `repr(fty)`
 - Bump `svd-parser` dependency (0.8.1)
+- Switched from denying all warnings to only a subset.
 
 ## [v0.16.1] - 2019-08-17
 

src/generate/device.rs

@@ -45,9 +45,29 @@ pub fn render(
 
     out.push(quote! {
         #![doc = #doc]
+        // Deny a subset of warnings
+        #![deny(const_err)]
+        #![deny(dead_code)]
+        #![deny(improper_ctypes)]
+        #![deny(legacy_directory_ownership)]
         #![deny(missing_docs)]
-        #![deny(warnings)]
+        #![deny(no_mangle_generic_items)]
+        #![deny(non_shorthand_field_patterns)]
+        #![deny(overflowing_literals)]
+        #![deny(path_statements)]
+        #![deny(patterns_in_fns_without_body)]
+        #![deny(plugin_as_library)]
+        #![deny(private_in_public)]
+        #![deny(safe_extern_statics)]
+        #![deny(unconditional_recursion)]
+        #![deny(unions_with_drop_fields)]
+        #![deny(unused_allocation)]
+        #![deny(unused_comparisons)]
+        #![deny(unused_parens)]
+        #![deny(while_true)]
+        // Explicitly allow a few warnings that may be verbose
         #![allow(non_camel_case_types)]
+        #![allow(non_snake_case)]
         #![no_std]
     });