set defaults for all fields in SymbolGraphOptions

Author: QuietMisdreavus

include/swift/SymbolGraphGen/SymbolGraphOptions.h

@@ -21,33 +21,33 @@ namespace symbolgraphgen {
 
 struct SymbolGraphOptions {
   /// The directory to output the symbol graph JSON files.
-  StringRef OutputDir;
+  StringRef OutputDir = StringRef{};
 
   /// The target of the module.
-  llvm::Triple Target; 
+  llvm::Triple Target = llvm::Triple{};
   /// Pretty-print the JSON with newlines and indentation.
-  bool PrettyPrint;
+  bool PrettyPrint = false;
 
   /// The minimum access level that symbols must have in order to be
   /// included in the graph.
-  AccessLevel MinimumAccessLevel;
+  AccessLevel MinimumAccessLevel = AccessLevel::Public;
 
   /// Emit members gotten through class inheritance or protocol default
   /// implementations with compound, "SYNTHESIZED" USRs.
-  bool EmitSynthesizedMembers;
+  bool EmitSynthesizedMembers = false;
 
   /// Whether to print informational messages when rendering
   /// a symbol graph.
-  bool PrintMessages;
+  bool PrintMessages = false;
 
   /// Whether to skip docs for symbols with compound, "SYNTHESIZED" USRs.
-  bool SkipInheritedDocs;
+  bool SkipInheritedDocs = false;
 
   /// Whether to emit symbols with SPI information.
-  bool IncludeSPISymbols;
+  bool IncludeSPISymbols = false;
 
   /// Whether to include documentation for clang nodes or not.
-  bool IncludeClangDocs;
+  bool IncludeClangDocs = false;
 };
 
 } // end namespace symbolgraphgen