Fix warnings (#98)

src/declare.rs

@@ -40,12 +40,12 @@ pub fn declare_global_with_linkage(&self, name: &str, ty: Type<'gcc>, linkage: G
         global
     }
 
-    pub fn declare_func(&self, name: &str, return_type: Type<'gcc>, params: &[Type<'gcc>], variadic: bool) -> RValue<'gcc> {
+    /*pub fn declare_func(&self, name: &str, return_type: Type<'gcc>, params: &[Type<'gcc>], variadic: bool) -> RValue<'gcc> {
         self.linkage.set(FunctionType::Exported);
         let func = declare_raw_fn(self, name, () /*llvm::CCallConv*/, return_type, params, variadic);
         // FIXME(antoyo): this is a wrong cast. That requires changing the compiler API.
         unsafe { std::mem::transmute(func) }
-    }
+    }*/
 
     pub fn declare_global(&self, name: &str, ty: Type<'gcc>, is_tls: bool, link_section: Option<Symbol>) -> LValue<'gcc> {
         let global = self.context.new_global(None, GlobalKind::Exported, ty, name);

src/intrinsic/mod.rs

@@ -272,7 +272,7 @@ fn codegen_intrinsic_call(&mut self, instance: Instance<'tcx>, fn_abi: &FnAbi<'t
                     use rustc_target::abi::Abi::*;
                     let tp_ty = substs.type_at(0);
                     let layout = self.layout_of(tp_ty).layout;
-                    let use_integer_compare = match layout.abi {
+                    let _use_integer_compare = match layout.abi {
                         Scalar(_) | ScalarPair(_, _) => true,
                         Uninhabited | Vector { .. } => false,
                         Aggregate { .. } => {