[Bug gdb/18805] New: GDB crushes on loading symbols (init class with tuple)

[Bug gdb/18805] New: GDB crushes on loading symbols (init class with tuple)

[tower120 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18805

            Bug ID: 18805
           Summary: GDB crushes on loading symbols (init class with tuple)
           Product: gdb
           Version: 7.9
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: tower120 at gmail dot com
  Target Milestone: ---

GDB <= 7.9.1 crushes (seg fault) on loading symbols with the following code:


template < class FnSequence = std::tuple<> >
struct LazyFn{
    const FnSequence fn_sequence;

    LazyFn(FnSequence fn_sequence = std::tuple<>() )
            :fn_sequence(fn_sequence){}
};


int main() {
  auto f1 = [](auto&& x){cout << "Hello, World!" << endl;};
  using F1 = decltype(f1);
  auto lazy = LazyFn< std::tuple<F1> >(std::tuple<F1>(f1));

  return 0;
}

-----------------------------------------------------------------
With additional function it works ok:


template <class T>
auto make_lazy(T t){
    return LazyFn<T>(t);
}

auto lazy = make_lazy(f1);

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[Bug gdb/18805] GDB crushes on loading symbols (init class with tuple)

[tower120 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18805

tower120 at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tower120 at gmail dot com

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[Bug gdb/18805] GDB crushes on loading symbols (init class with tuple)

[tower120 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18805

--- Comment #1 from tower120 at gmail dot com ---
Ups sorry, code from above should be:

auto lazy = make_lazy(make_tuple(f1));

And it still crushes. So there is no workaround for this.

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[Bug gdb/18805] GDB crushes on loading symbols (init class with tuple)

[tower120 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18805

--- Comment #2 from tower120 at gmail dot com ---
I think the problem arise from #18807:
https://sourceware.org/bugzilla/show_bug.cgi?id=18807

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[Bug gdb/18805] GDB crushes on loading symbols (init class with tuple)

[xdje42 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18805

Doug Evans <xdje42 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |xdje42 at gmail dot com

--- Comment #3 from Doug Evans <xdje42 at gmail dot com> ---
Infinite recursion in the demangler.

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[Bug gdb/18805] GDB crushes on loading symbols (init class with tuple)

[xdje42 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18805

--- Comment #4 from Doug Evans <xdje42 at gmail dot com> ---
Here's the triggering symbol:
_ZSt7forwardIRZ4mainEUlOT_E_ES1_RNSt16remove_referenceIS0_E4typeE

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[Bug gdb/18805] GDB crashes on loading symbols (init class with tuple)

[ssbssa at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18805

Hannes Domani <ssbssa at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ssbssa at sourceware dot org
             Status|NEW                         |RESOLVED
   Target Milestone|---                         |8.0
         Resolution|---                         |FIXED

--- Comment #6 from Hannes Domani <ssbssa at sourceware dot org> ---
gdb does not crash since 8.0:

(gdb) demangle
_ZSt7forwardIRZ4mainEUlOT_E_ES1_RNSt16remove_referenceIS0_E4typeE
main::{lambda(auto:1&&)#1}&
std::forward<main::{lambda(auto:1&&)#1}&>(std::remove_reference<main::{lambda(auto:1&&)#1}&>::type&)

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