Debug print std::string with gdb with Chrome under Chrome OS

[Kush Sinha]

I am trying to debug Chrome under Chrome OS (Simple Chrome) and following https://chromium.googlesource.com/chromiumos/docs/+/master/simple_chrome_workflow.md#Debugging 

When I try to print std::string in gdb:

(gdb) print primary_account_

I get:

$1 = {

  <std::__1::__basic_string_common<true>> = {<No data fields>}, 

  members of std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >: 

  __r_ = {

    <std::__1::__libcpp_compressed_pair_imp<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__rep, std::__1::allocator<char>, 2>> = {

      <std::__1::allocator<char>> = {<No data fields>}, 

      members of std::__1::__libcpp_compressed_pair_imp<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__rep, std::__1::allocator<char>, 2>: 

      __first_ = {

        {

          __l = {

            __cap_ = 0, 

            __size_ = 0, 

            __data_ = 0x0

          }, 

          __s = {

            {

              __size_ = 0 '\000', 

              __lx = 0 '\000'

            }, 

            __data_ = '\000' <repeats 22 times>

          }, 

          __r = {

            __words = {0, 0, 0}

          }

        }

      }

    }, <No data fields>}, 

  static npos = 18446744073709551615

}

When I do:

(gdb) print primary_account_.c_str()

I get:

Cannot evaluate function -- may be inlined

Relevant gn args:

is_debug = true                                                                 

is_component_build = false                                                      

is_official_build = false                                                       

remove_webcore_debug_symbols = true                                             

use_debug_fission = false

Also, from the instructions above, when I remotely connect to my Chromebook, I get warnings of the form of:

warning: .dynamic section for "[REDACTED]/chromium/.cros_cache/chrome-sdk/tarballs/sand+10333.0.0+sysroot_chromeos-base_chromeos-chrome.tar.xz/usr/lib64/libcups.so.2" is not at the expected address (wrong library or version mismatch?)

Has anyone run into this before?

[sin...@chromium.org]

Figured it out. I was trying to use libstdc++ pretty printers. Chromium uses libc++.

Here is a set of macros that work https://github.com/koutheir/libcxx-pretty-printers