[Bug symtab/16581] New: GDB crash on inherit_abstract_dies infinite recursion

["brobecker at gnat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16581

            Bug ID: 16581
           Summary: GDB crash on inherit_abstract_dies infinite recursion
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: brobecker at gnat dot com

Compiling at high levels of optimization some code involving nested subprograms
making recursive calls of the parent function sometimes produces some debugging
information that causes GDB to crash.

See https://www.sourceware.org/ml/gdb-patches/2014-01/msg00798.html:

The c++ code causing the problem is:

    // Integer variants of certain metrics, used for HTML rendering.
    int ascent(FontBaseline baselineType = AlphabeticBaseline) const
    {
        if (baselineType == AlphabeticBaseline)
            return lroundf(m_ascent);
        return height() - height() / 2;
    }

    int height(FontBaseline baselineType = AlphabeticBaseline) const
    {
        return ascent(baselineType) + descent(baselineType);
    }

As you can see,ascent(0x5816d55) calls height(0x5812c1b),and height calls
ascent(0x5816d55) recursivly.And the compiler  generates these dwarf code
representing this relationship preciously.

>> A dwarf die may have the following relationship:
>> 564860c<-----------------------------
>>   |                                 |
>>   |(abstract origin)                |
>>   |                                 |
>>   V                                 |
>> 5816d55                             | (abstract origin)
>>   |                                 |
>>   |(child)                          |
>>   |                                 |
>>   V                                 |
>>   ...                               |
>> 5812c34------------------------------
>> So inherit_abstract_dies may results in infinite recursive call.

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