[dataflow]

Try

  struct S { struct { int x; }; };

under -pedantic and you'll get

  warning: ISO C++ prohibits anonymous structs [-Wpedantic]

[midjji]

Pedantic is for the older C++ standard, its not pedantic for the latter e.g c++11, I think this changed.

[junon]

No, pedantic is for disabling compiler extensions. You still need to explicitly specify a standard.

[midjji]

gcc pedantic ignores the language flag, and clang and intel state they mirror gcc. So pedantic would be not C++11 even if you added that.

[dataflow]

Well that blows my mind, I never realized pedantic ignores the language setting. Is this the only case where it does that?