Why is include_dependence_headers set to false with the --gen-onefile option?

[h-shan]

flatbuffers/src/flatc.cpp

Line 515 in 832c618

opts.include_dependence_headers = false;

Without including dependencies, client code must manually include all dependencies. There is no way to set this flag to true once it is made false. What makes including dependencies incompatible with the --gen-onefile option?

[dbaileychess]

There are no dependencies when everything is outputted to a single file.

[h-shan]

There are dependencies when I include other fbs files. Here is a basic example to describe the issue:

foo.fbs

table foo {
    x: int;
}

bar.fbs

include "foo.fbs";

table bar {
    f : foo;
}

As you can see below, in the generated bar_generated.h, fooT is not defined:

// automatically generated by the FlatBuffers compiler, do not modify


#ifndef FLATBUFFERS_GENERATED_BAR_H_
#define FLATBUFFERS_GENERATED_BAR_H_

#include "flatbuffers/flatbuffers.h"

struct bar;
struct barBuilder;
struct barT;

bool operator==(const barT &lhs, const barT &rhs);
bool operator!=(const barT &lhs, const barT &rhs);

inline const flatbuffers::TypeTable *barTypeTable();

struct barT : public flatbuffers::NativeTable {
  typedef bar TableType;
  static FLATBUFFERS_CONSTEXPR_CPP11 const char *GetFullyQualifiedName() {
    return "barT";
  }
  std::unique_ptr<fooT> f{};
  barT() = default;
  barT(const barT &o);
  barT(barT&&) FLATBUFFERS_NOEXCEPT = default;
  barT &operator=(barT o) FLATBUFFERS_NOEXCEPT;
};

User code would have to manually include foo_generated.h, where fooT is actually defined, and this becomes unwieldy in big projects.

These are my flatc options:

 --gen-mutable
        --gen-object-api
        --gen-compare
        --gen-name-strings
        --reflect-types
        --reflect-names
        --gen-onefile
        -c
        -p
        -b
        -o 

Here are the full generated files for reference:
bar_generated.h.txt
foo.fbs.txt
foo_generated.h.txt
bar.fbs.txt