[Bug debug/60833] New: Inheritance via typedef skips the typedef

[Bug debug/60833] New: Inheritance via typedef skips the typedef

[dblaikie at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60833

            Bug ID: 60833
           Summary: Inheritance via typedef skips the typedef
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dblaikie at gmail dot com

struct base {
};

typedef base tbase;

struct derived: tbase {
} x;

GCC doesn't emit the typedef of 'tbase' and instead describes 'derived' as
directly deriving from 'base'.

[Bug debug/60833] Inheritance via typedef skips the typedef

[mark at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60833

--- Comment #1 from Mark Wielaard <mark at gcc dot gnu.org> ---
Confirmed with GNU C++ 4.10.0 20140417 (experimental). GCC doesn't emit the
typedef for tbase because it is unused. It will emit the typedef for tbase when
it is used for a variable like tbase y. But even then it will optimize out the
typedef from the inherentence tree and make the DW_TAG_inherentence tag
DW_AT_type attribute of the derived struct DIE point directly to the struct
base type DIE.

[Bug debug/60833] Inheritance via typedef skips the typedef

[dblaikie at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60833

--- Comment #3 from David Blaikie <dblaikie at gmail dot com> ---
FWIW, bug on the GDB side seems to have been fixed (
https://sourceware.org/bugzilla/show_bug.cgi?id=16841 ) - might be nice to fix
the GCC side too. (though, admittedly, I don't know that this extra debug info
provides much value at the moment - I think GDB mostly looks straight through
typedefs)