[Bug c++/20020] GDB segfault on printing objects

["snyder at bnl dot gov" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20020

scott snyder <snyder at bnl dot gov> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |snyder at bnl dot gov

--- Comment #8 from scott snyder <snyder at bnl dot gov> ---
I've started seeing this when printing C++ std::atomic<T*> values.

Here's the reproducer i came up with:

-- x.cc -----------------------------
template<typename _Tp>
struct foo
{
  static constexpr bool is_always_lock_free = true;
};


int main()
{
  foo<int> p;
  return 0;
}
---------------------------------------------------------

Then with 

gcc version 7.2.1 20170915 (Red Hat 7.2.1-2) (GCC) 

we get

$ /usr/bin/gcc -g -o x x.cc -std=c++17
$ ~/tmp/gdb/gdb-8.0.1/gdb/gdb ./x
...
GNU gdb (GDB) 8.0.1
...
Reading symbols from ./x...done.
(gdb) break main
Breakpoint 1 at 0x40048b: file x.cc, line 11.
(gdb) run
Starting program: /home/sss/atlas/dvtest/x 

Breakpoint 1, Python Exception <type 'exceptions.NameError'> Installation
error: gdb.execute_unwinders function is missing: 
main () at x.cc:11
11        return 0;
(gdb) p p
$1 = {
Segmentation fault (core dumped)


The crash is the same as reported earlier in this thread.

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