Segfault upon printing Point in GDB

[Corbin Foucart]

Hello all,

When I attempt to use the GDB 'print' command to print information about a Point object, I'm having some trouble. For example, suppose I've defined

const Point<dim> p_ex(1, 1);

• If I run GDB and attempt 'print p_ex[0]' the output is 'Could not find operator[]'
• If I attempt 'print p_ex', GDB segfaults

I imagine printing these sorts of objects is a common procedure, so I'm hoping someone might be able to help me shed light on this!

More details:

I've attached a minimal code example which reproduces the issue. I compile the program without issue on Ubuntu 18.04.5 LTS and the exact GDB commands I use are:

> gdb ./step

>> break step.cc:26

>> r

Breakpoint 1, main () at src/step.cc:27
27      return 0;

>> print bottom_left[0]

Could not find operator[].

>> print bottom_left

$1 = {<dealii::Tensor<1, 2, double>> = {
Segmentation fault (core dumped)

Best,

Corbin

[Corbin Foucart]

And the file is here.

[Bruno Turcksin]

Corbin,

Take a look at https://dealii.org/developer/users/gdb.html This should help. Note that gdb should not segfault. It probably means that there is a problem with your code.

Best,

Bruno