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

[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]

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>
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-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://bugs.gentoo.org/>.
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 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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[Bug c++/18157] Segfault when debugging a program where an initializer list contains a lambda function with auto variables

[keiths at redhat dot com]

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

Keith Seitz <keiths at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |keiths at redhat dot com
         Resolution|---                         |FIXED
   Target Milestone|---                         |7.8

--- Comment #1 from Keith Seitz <keiths at redhat dot com> ---
I've verified that this is another libiberty demangler crashing bug.  It is
also fixed in GDB 7.8+.

If you'd like a patch, look at commits 91662bad2, fd259167d, 9548bbede, and
53f94b92e (all in libiberty).

It might be possible to toss together something relatively easily by simply
grabbing a recent copy of libiberty/cp-demangle.[ch].

Otherwise, the easiest thing to do is simply upgrade to 7.8 or 7.9.

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