Sounds like the compiler omitted the type info for std::string. Try "-glldb" in
your compiler flags. This tunes debug info for LLDB. A lot of compilers will
try to omit types from debug info if the type doesn't originate in the current
executable. std::string would be one of those classes. If that flag doesn't
work, then you might try -fno-limit-debug-info.
Let me know if that helps!
> On Jul 18, 2019, at 5:45 PM, Bob Eastbrook <baconeater...@gmail.com> wrote:
>
> Thanks for the info. "frame var --raw msg" is empty on my Fedora 30
> system, but populated correctly on Ubuntu 19.04. E.g., on Fedora 30:
>
> (lldb) frame var --raw msg
> (std::string) msg = {}
>
> I compiled with "clang++ -g main.cpp". Nothing fancy. Installed
> Clang with "dnf install clang". Again, nothing fancy.
>
> I'm a LLVM newb. Can you point me in the right direction?
>
>
>
>
> On Fri, Jul 12, 2019 at 1:56 PM Greg Clayton <clayb...@gmail.com> wrote:
>>
>> We have a summary provider for std::string that is built into LLDB that must
>> not be working with the C++ runtime you are using. The current summary
>> string that is used is in
>> source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp in
>> LoadLibStdcppFormatters:
>>
>> lldb::TypeSummaryImplSP std_string_summary_sp(
>> new StringSummaryFormat(stl_summary_flags, "${var._M_dataplus._M_p}"));
>>
>> So do a "frame var --raw msg" and see what the members of your std::string
>> look like. I am guessing you won't see "_M_dataplus" or "_M_p" in there. The
>> "${var" means your std::string variable, and we are trying to access
>> "msg._M_dataplus._M_p" to see what the string looks like.
>>
>>
>> On Jun 24, 2019, at 10:26 PM, Bob Eastbrook via lldb-dev
>> <lldb-dev@lists.llvm.org> wrote:
>>
>> With Clang 8.0.0 and libstd++ 9.1.1 on Fedora 30 x86_64, I get this
>> error from LLDB when trying to see the value of a string:
>>
>> "error: summary string parsing error"
>>
>> The code is simply:
>>
>> std::string msg{"foo bar baz"};
>>
>> With libcxx 8.0.0, instead of the above error, I simply see "??" when
>> inspecting the msg variable.
>>
>> All of the above works fine for me in Ubuntu 19.04. I only have the
>> problem with Fedora 30. Tried in both CLion and VS Code.
>>
>> How should I troubleshoot this? Could I be missing a package?
>> _______________________________________________
>> lldb-dev mailing list
>> lldb-dev@lists.llvm.org
>> https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>>
>>
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