How to enable libstdc++ Pretty Printers in GDB #poky

How to enable libstdc++ Pretty Printers in GDB #poky

[Rahul Chauhan]

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Hi Team,

Can any one please help me  to enable libstdc++ Pretty Printers in GDB .

As of now i am only seeing below pretty printer enable.
(gdb) info pretty-printer
global pretty-printers:
builtin
mpx_bound128

I tried
IMAGE_INSTALL:append = " libstdc++" but unfortunately no luck.

Thanks
Rahul Chauhan

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Re: [OE-core] How to enable libstdc++ Pretty Printers in GDB #poky

[Khem Raj]

On Mon, Jan 29, 2024 at 5:13 AM Rahul Chauhan
<rahulchauhankitps@gmail.com> wrote:
>
> Hi Team,
>
> Can any one please help me  to enable libstdc++ Pretty Printers in GDB .
>
> As of now i am only seeing below pretty printer enable.
> (gdb) info pretty-printer
> global pretty-printers:
>   builtin
>     mpx_bound128
>
> I tried
>
> IMAGE_INSTALL:append = " libstdc++"

yeah libstdc++ pretty printing is provided via printer.py which is
part of gcc-runtime-dbg package so try
adding  IMAGE_INSTALL:append = " gcc-runtime-dbg" and see if if it
helps. You will also need to add

set auto-load safe-path /

temporarily, or apply a backport of this fix [1] to your core layer

[1] https://lore.kernel.org/openembedded-core/20240129190654.2553357-1-raj.khem@gmail.com/T/#u



>
> but unfortunately no luck.
>
> Thanks
> Rahul Chauhan
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Re: How to enable libstdc++ Pretty Printers in GDB #poky

[Rahul Chauhan]

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Hi Khem Raj,

Thankyou very much for quick solution.

I backported patch and added below line in local.conf and its working fine.
IMAGE_INSTALL:append = " gcc-runtime-dbg"

but but when i am checking *info pretty-printer* i am not seeing libstdc++-v6 in the list
(gdb) info pretty-printer
global pretty-printers:
builtin
mpx_bound128

But I was expecting
(gdb) info pretty-printer
global pretty-printers:
builtin
mpx_bound128
libstdc++-v6

Can you please comment on this?

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Re: [OE-core] How to enable libstdc++ Pretty Printers in GDB #poky

[Khem Raj]

On Tue, Jan 30, 2024 at 9:27 PM Rahul Chauhan
<rahulchauhankitps@gmail.com> wrote:
>
> Hi Khem Raj,
>
> Thankyou very much for quick solution.
>
> I backported patch and added below line in local.conf and its working fine.
> IMAGE_INSTALL:append = " gcc-runtime-dbg"
>
> but but when i am checking info pretty-printer i am not seeing libstdc++-v6 in the list
> (gdb) info pretty-printer
> global pretty-printers:
> builtin
> mpx_bound128
>
> But I was expecting
> (gdb) info pretty-printer
> global pretty-printers:
> builtin
> mpx_bound128
> libstdc++-v6
>
> Can you please comment on this?

It is loaded on demand. So put a breakpoint on main and let it run
till main so that
it loads the libstdc++ library and then check again.

>
>
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Re: How to enable libstdc++ Pretty Printers in GDB #poky

[Rahul Chauhan]

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Hi Khem Raj,

I noti ced that whe n I chec k th e in fo p rett y-pr inte r co mman d ou tput aft er l oadi ng t he t est appl icat ion with gdb ,
it is show ing the expe cted beh avio r. T his mean s th at e very thin g se ems to b e fu ncti onin g co rrec tly in t hat aspe ct.

Thanks for your support.

bash-5.1# gdb -q test
Reading symbols from test...
(gdb) b 12
Breakpoint 1 at 0x234e: file test.cpp, line 12.
(gdb) r
Starting program: /test
warning: Error disabling address space randomization: Operation not permitted
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/libthread_db.so.1".

Breakpoint 1, main () at test.cpp:12
12          return 0;
(gdb) p s
$1 = "test"
(gdb) p vi
$2 = std::vector of length 3, capacity 4 = {1, 2, 3}
(gdb) info pretty-printer
global pretty-printers:
builtin
mpx_bound128
objfile /lib/libstdc++.so.6 pretty-printers:
libstdc++-v6
__gnu_cxx::_Slist_iterator
__gnu_cxx::__8::_Slist_iterator
__gnu_cxx::__8::__normal_iterator
__gnu_cxx::__8::slist
__gnu_cxx::__normal_iterator
__gnu_cxx::slist
__gnu_debug::_Safe_iterator
std::_Bit_const_iterator
std::_Bit_iterator
std::_Bit_reference
std::_Deque_const_iterator
std::_Deque_iterator
std::_Fwd_list_const_iterator
std::_Fwd_list_iterator
std::_List_const_iterator
std::_List_iterator
std::_Node_handle
std::_Rb_tree_const_iterator
std::_Rb_tree_iterator
std::__8::_Bit_const_iterator
std::__8::_Bit_iterator
std::__8::_Bit_reference
std::__8::_Deque_const_iterator
std::__8::_Deque_iterator
std::__8::_Fwd_list_const_iterator
std::__8::_Fwd_list_iterator
std::__8::_List_const_iterator
std::__8::_List_iterator
std::__8::_Node_handle
std::__8::_Rb_tree_const_iterator
std::__8::_Rb_tree_iterator
std::__8::__cxx11::__cxx1998::list
std::__8::__cxx11::basic_string
std::__8::__cxx11::list
std::__8::__cxx1998::_Bit_const_iterator
std::__8::__cxx1998::_Bit_iterator
std::__8::__cxx1998::_Bit_reference
std::__8::__cxx1998::_Deque_const_iterator
std::__8::__cxx1998::_Deque_iterator
std::__8::__cxx1998::_Fwd_list_const_iterator
std::__8::__cxx1998::_Fwd_list_iterator
std::__8::__cxx1998::_List_const_iterator
std::__8::__cxx1998::_List_iterator
std::__8::__cxx1998::bitset
std::__8::__cxx1998::deque
std::__8::__cxx1998::forward_list

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