[lldb-dev] "error: summary string parsing error" on Fedora 30
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?
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Re: [lldb-dev] "error: summary string parsing error" on Fedora 30
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 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
> 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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Re: [lldb-dev] "error: summary string parsing error" on Fedora 30
On Fri, Jul 19, 2019 at 4:08 PM Greg Clayton wrote: > 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. Thanks, Greg. Using "-g -fno-limit-debug-info" did the trick. All works as expected now. Apparently the versions which ship with Ubuntu 19.04 and Fedora 30 differ with respect to this flag. ___ lldb-dev mailing list lldb-dev@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
Re: [lldb-dev] "error: summary string parsing error" on Fedora 30
On Mon, Jul 22, 2019 at 1:19 PM Greg Clayton wrote: > > Apparently the versions which ship with Ubuntu 19.04 and Fedora 30 differ > > with respect to this flag. > > So are you saying "-glldb" is wrong on Fedora but "-fno-limit-debug-info" > works? On Fedora 30: -g: no debug info -glldb: no debug info -g -glldb: no debug info -g -fno-limit-debug-info: debug info present I'm trying to determine if "-fno-limit-debug-info" is enabled by default on Fedora 30, but don't have it it figured out yet. ___ lldb-dev mailing list lldb-dev@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
