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From: "dje at google dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug c++/18417] New: printing of std::cerr gets "warning: RTTI
 symbol for class 'std::iostream' has bad type"
Date: Fri, 15 May 2015 19:46:00 -0000
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X-Bugzilla-Component: c++
X-Bugzilla-Version: HEAD
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https://sourceware.org/bugzilla/show_bug.cgi?id=18417

            Bug ID: 18417
           Summary: printing of std::cerr gets "warning: RTTI symbol for
                    class 'std::iostream' has bad type"
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: dje at google dot com
  Target Milestone: ---

this is a corollary to PR 18141.
18141 is a perf issue, this one is for the correctness issue.

"p std::cerr" can give the following:

warning: RTTI symbol for class 'std::iostream' has bad type

this is because the minsym for the vtable is a typedef.

gnuv3_rtti_type calls check_typedef on the value's type,
and then does a minsym lookup by pc for the vtable
which returns "_ZTVSo" which demangles as
"vtable for std::ostream", and "std::iostream" is a typedef.

patch to follow.

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