C++ nested class bug/questions

Hello everyone,

I was debugging a program similar to the one attached and noticed a couple
of unexpected things happening. I compiled it with ”-g -O0” and g++ 11.1.0
(clang showed similar behaviour) and saw this:

(gdb) bt
#0  DF::vvv (this=0x7fffffffd120) at foo.cc:11
#1  0x0000555555555180 in foo () at foo.cc:16
#2  0x00005555555551a7 in main () at foo.cc:20
(gdb) ptype abcd
type = class DF::FFFF {
  private:
    int ffff;
}
(gdb) ptype FFFF
No symbol "FFFF" in current context.
(gdb) ptype DF::
FFFF   vvv()  
(gdb) ptype DF::FFFF
There is no field named FFFF
(gdb) ptype 'DF::FFFF'
type = class DF::FFFF {
  private:
    int ffff;
}
(gdb)

(The fourth command shows tab completion.)

The problems I see are:
1) I think it shouldn’t be DF::FFFF.
2) 'ptype FFFF’ should just work as it is in the current scope.
3) There shouldn’t be a need to quote DF:FFFF, right? Although that might just be a side-effect here.
4) The fact that a suggestion from tab completion doesn’t work is annoying. This is probably also be a side-effect.

Before debugging this further, I wanted to see if there are any comments/suggestions.
Am I even right about point 1? I couldn’t really find anything definitive
in my favourite cpp reference on this type of nesting. g++ and clang output FFFF as
foo()::DF::vvv()::FFFF as far as I can see.

I don’t see any obvious problems in the dwarf that is produced.

Thanks,
Felix

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