Crash after formatting selection

[sean-mcmanus]

Any solutions to this yet?
I have a similar issue: VSCode on Ubuntu 19.1, with C/C++ 0.26.1 extension installed. When I try to format a selected part of my code, I receive the error:

[Error - 6:16:27 p.m.] Connection to server got closed. Server will not be restarted.
[Error - 6:16:27 p.m.] Request textDocument/rangeFormatting failed.

Originally posted by @kei2e in #1975 (comment)

[sean-mcmanus]

@kei2e Our language server process is crashing. Can you attach a debugger to the Microsoft.VSCode.CPP.Extension.linux and provide a callstack or give more repro details? Are you using a multi-root workspace?

[kei2e]

@sean-mcmanus sorry, I am very new to this. Can you plz give me some instructions on how to attach a debugger to Microsoft.VSCode.CPP.Extension.linux?

No, I am not using a multi-root workspace.

[sean-mcmanus]

There are some docs at https://code.visualstudio.com/docs/cpp/cpp-debug.

You basically just need to create a launch.json file with a "(gdb) attach" config and set the program to the full path of the Microsoft.VSCode.CPP.Extension.linux binary (e.g. /home/user/.vscode/extensions/ms-vscode.cpptools-0.26.1/bin/Microsoft.VSCode.CPP.Extension.linux). Then click the Start Debugging button and repro the crash. Let me know if you want more info.

[sean-mcmanus]

Also, we have no known crashes involving formatting, so anything special about your environment or format settings you could think of could help (might be related to Ubuntu 19).

[sean-mcmanus]

Also, if you could set the C_Cpp.clang_format_path to another clang-format such as from http://releases.llvm.org/download.html , it's possible that could fix/workaround the issue.

[sean-mcmanus]

Looks like other users have hit this at #3559 .

[kei2e]

@sean-mcmanus thanks for the instructions and help!
I am working on it to provide you with more info .. in the meantime, I tried the formatter on a separate test.cpp file and got the following:

Formatting failed:
/home/keyvan/.vscode/extensions/ms-vscode.cpptools-0.26.1/bin/../LLVM/bin/clang-format -style={ BasedOnStyle: LLVM, UseTab: Never, IndentWidth: 2, TabWidth: 2, BreakBeforeBraces: Allman, AllowShortIfStatementsOnASingleLine: false, IndentCaseLabels: false, ColumnLimit: 0, AccessModifierOffset: -2 } -fallback-style=LLVM -sort-includes=0 -offset=364 -length=77 -assume-filename=/home/keyvan/test.cpp
/home/keyvan/.vscode/extensions/ms-vscode.cpptools-0.26.1/bin/../LLVM/bin/clang-format: error while loading shared libraries: libtinfo.so.5: cannot open shared object file: No such file or directory
  

[kei2e]

Okay .. it was fixed by installing clang-format,
sudo apt install clang-format
and adding
{ "C_Cpp.clang_format_path": "/usr/bin/clang-format" }
to settings.json, as suggested by penguingovernor at #3174. Now the formatter appears to be working fine in both workspaces.

I still do not know what exactly is going on. But let me know if I can be of any help figuring that out.

[sean-mcmanus]

Our Insiders release should fix this clang-format issue: https://github.com/microsoft/vscode-cpptools/releases/tag/0.27.0-insiders