[Bug c++/18157] New: Segfault when debugging a program where an initializer list contains a lambda function with auto variables

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

https://sourceware.org/bugzilla/show_bug.cgi?id=18157

            Bug ID: 18157
           Summary: Segfault when debugging a program where an initializer
                    list contains a lambda function with auto variables
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: sourceware at optimojoe dot com

The following program:

------
#include <functional>

struct Foo {
    std::function <void(double &)> f;
    Foo (
        std::function <void(double &)> const & f_ 
    ) : f(f_) {}
};

struct Bar {
    Foo foo;
    Bar() :
        foo([](auto & num) {})
    {}
};

int main() {
    Bar bar;
}
------

segfaults gdb on startup:

$ gdb test19
GNU gdb (Gentoo 7.7.1 p1) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
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Type "show configuration" for configuration details.
For bug reporting instructions, please see:
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Reading symbols from test19...Segmentation fault

However, when changing the line

        foo([](auto & num) {})

to

        foo([](double & num) {})

gdb works as normal.  In case it helps:

GNU gdb (Gentoo 7.7.1 p1) 7.7.1
gcc version 4.9.2 (Gentoo 4.9.2 p1.0, pie-0.6.1)

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