[Bug c++/16845] New: GDB crashs when debugging a simple example of rvalues

["edub4rt at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16845

            Bug ID: 16845
           Summary: GDB crashs when debugging a simple example of rvalues
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: edub4rt at gmail dot com

GDB is crashing when trying to debug a simple binary generated by the code
provided below. However it runs fine when compiling with optimization active.

$ g++ --version
g++ (GCC) 4.8.2 20140206 (prerelease)
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ g++ -std=c++11 bug.cpp -O0 -o bug && gdb ./bug
GNU gdb (GDB) 7.7
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./bug...Segmentation fault (core dumped)


$ g++ -std=c++11 bug.cpp -O1 -o bug && gdb ./bug
GNU gdb (GDB) 7.7
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./bug...(no debugging symbols found)...done.
(gdb) 


Test case file:

#include <vector>
#include <functional>
#include <memory>

std::vector<std::function<void()>> tasks;

template<class F>
void post(F&& task) {
    typedef typename std::remove_reference<F>::type _F;
    std::shared_ptr<_F> taskPtr(new _F(std::forward<F>(task)));
    tasks.push_back([taskPtr] { (*taskPtr)(); });
}

void add_task() {
    std::function<void()> action;
    post(std::move(action));
}

int main()
{
    return 0;
}

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