Add an option and checking for generation of deprecated declarations.

Author: tritao

src/CppParser/AST.cpp

@@ -272,7 +272,7 @@ Declaration::Declaration(const Declaration& rhs)
     , isDependent(rhs.isDependent)
     , isImplicit(rhs.isImplicit)
     , isInvalid(rhs.isInvalid)
-    , isDeprecated(false)
+    , isDeprecated(rhs.isDeprecated)
     , completeDeclaration(rhs.completeDeclaration)
     , definitionOrder(rhs.definitionOrder)
     , PreprocessedEntities(rhs.PreprocessedEntities)

src/Generator/Options.cs

@@ -144,6 +144,13 @@ public bool DoAllModulesHaveLibraries() =>
         /// </summary>
         public bool GenerateDefaultValuesForArguments { get; set; }
 
+        /// <summary>
+        /// If set to false, then deprecated C/C++ declarations (those that have
+        /// the `__attribute__((deprecated))` or equivalent attribute) will not be
+        /// generated.
+        /// </summary>
+        public bool GenerateDeprecatedDeclarations { get; set; } = true;
+
         public bool StripLibPrefix { get; set; }
 
         /// <summary>

src/Generator/Passes/CheckIgnoredDecls.cs

@@ -85,6 +85,13 @@ public override bool VisitDeclaration(Declaration decl)
                 return true;
             }
 
+            if (decl.IsDeprecated && !Options.GenerateDeprecatedDeclarations)
+            {
+                Diagnostics.Debug("Decl '{0}' was ignored due to being deprecated", decl.Name);
+                decl.ExplicitlyIgnore();
+                return true;
+            }
+
             if (!CheckDeclarationAccess(decl))
             {
                 Diagnostics.Debug("Decl '{0}' was ignored due to invalid access",