Only include direct included filed (#7348)

include/flatbuffers/idl.h

@@ -911,6 +911,11 @@ class Parser : public ParserState {
   // @param opts Options used to parce a schema and generate code.
   static bool SupportsOptionalScalars(const flatbuffers::IDLOptions &opts);
 
+  // Get the set of included files that are directly referenced by the file
+  // being parsed. This does not include files that are transitively included by
+  // others includes.
+  std::vector<std::string> GetIncludedFiles() const;
+
  private:
   class ParseDepthGuard;
 

src/idl_gen_cpp.cpp

@@ -221,33 +221,34 @@ class CppGenerator : public BaseGenerator {
   }
 
   void GenIncludeDependencies() {
-    int num_includes = 0;
     if (opts_.generate_object_based_api) {
       for (auto it = parser_.native_included_files_.begin();
            it != parser_.native_included_files_.end(); ++it) {
         code_ += "#include \"" + *it + "\"";
-        num_includes++;
       }
     }
 
-    std::vector<std::string> include_files;
-    for (auto it = parser_.included_files_.begin();
-         it != parser_.included_files_.end(); ++it) {
-      if (it->second.empty()) continue;
-      include_files.push_back(it->second);
-    }
-    std::stable_sort(include_files.begin(), include_files.end());
+    // Get the directly included file of the file being parsed.
+    std::vector<std::string> included_files(parser_.GetIncludedFiles());
 
-    for (auto it = include_files.begin(); it != include_files.end(); ++it) {
-      auto noext = flatbuffers::StripExtension(*it);
-      auto basename = flatbuffers::StripPath(noext);
-      auto includeName =
-          GeneratedFileName(opts_.include_prefix,
-                            opts_.keep_include_path ? noext : basename, opts_);
-      code_ += "#include \"" + includeName + "\"";
-      num_includes++;
+    // We are safe to sort them alphabetically, since there shouldn't be any
+    // interdependence between them.
+    std::stable_sort(included_files.begin(), included_files.end());
+
+    for (const std::string &included_file : included_files) {
+      auto noext = flatbuffers::StripExtension(included_file);
+      code_ +=
+          "#include \"" +
+          GeneratedFileName(
+              opts_.include_prefix,
+              opts_.keep_include_path ? noext : flatbuffers::StripPath(noext),
+              opts_) +
+          "\"";
+    }
+
+    if (!parser_.native_included_files_.empty() || !included_files.empty()) {
+      code_ += "";
     }
-    if (num_includes) code_ += "";
   }
 
   void GenExtraIncludes() {

src/idl_parser.cpp

@@ -2189,12 +2189,8 @@ template<typename T> void EnumDef::ChangeEnumValue(EnumVal *ev, T new_value) {
 }
 
 namespace EnumHelper {
-template<BaseType E> struct EnumValType {
-  typedef int64_t type;
-};
-template<> struct EnumValType<BASE_TYPE_ULONG> {
-  typedef uint64_t type;
-};
+template<BaseType E> struct EnumValType { typedef int64_t type; };
+template<> struct EnumValType<BASE_TYPE_ULONG> { typedef uint64_t type; };
 }  // namespace EnumHelper
 
 struct EnumValBuilder {
@@ -2464,6 +2460,13 @@ CheckedError Parser::CheckClash(std::vector<FieldDef *> &fields,
   return NoError();
 }
 
+std::vector<std::string> Parser::GetIncludedFiles() const {
+  const auto it = files_included_per_file_.find(file_being_parsed_);
+  if (it == files_included_per_file_.end()) { return {}; }
+
+  return { it->second.cbegin(), it->second.cend() };
+}
+
 bool Parser::SupportsOptionalScalars(const flatbuffers::IDLOptions &opts) {
   static FLATBUFFERS_CONSTEXPR unsigned long supported_langs =
       IDLOptions::kRust | IDLOptions::kSwift | IDLOptions::kLobster |
@@ -3332,8 +3335,8 @@ CheckedError Parser::CheckPrivatelyLeakedFields(const Definition &def,
   const auto is_field_private = value_type.attributes.Lookup("private");
   if (!is_private && is_field_private) {
     return Error(
-      "Leaking private implementation, verify all objects have similar "
-      "annotations");
+        "Leaking private implementation, verify all objects have similar "
+        "annotations");
   }
   return NoError();
 }