[Bug c++/17580] New: GDB fails to inspect a particular class

["rschoppmeyer at vmware dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17580

            Bug ID: 17580
           Summary: GDB fails to inspect a particular class
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: rschoppmeyer at vmware dot com

Created attachment 7923
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7923&action=edit
reproducing example

Skim instructions in README (included in attached file).

Platform: Ubuntu 14.04.1
Compiler: Ubuntu clang version 3.4-1ubuntu3 (tags/RELEASE_34/final) (based on
LLVM 3.4)
GDB:      GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1

See attached file for a concise reproducing example.
notmain.cc contains a class NetInfo with a single member, `name` of class
String.
The `String` class is a subclass of std::string declared in notstring.hh.

Attempting to `print info` in GDB after its declaration yields:
(gdb) p info
$1 = {name = <error reading variable>

Attempting to `print info.name` produces the rather nonsensical error message:
(gdb) p info.name
That operation is not available on integers of more than 8 bytes.

Printing any other instance of the NetInfo class is aborted in a similar
manner.  Observe that printing the class is truncated, no closing '}' is
printed.  If there are other members in NetInfo following `name`, they are
omitted.  If you try to print a class that contains a member of type NetInfo,
printing moves on to that class' next member after aborting printing NetInfo.

If you compile the attached file as a single execution unit (`make monolith`),
this issue is not reproducible.

I guess it's also possible that this is a clang bug.

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