'iostream' file not foundclang(pp_file_not_found)

[HansLjy]

After I upgrade my system (ubuntu 22.04), it seems clangd cannot find standard libraries like iostream.

Minimum code:

#include <iostream>
int main() {
}

cmake file:

cmake_minimum_required(VERSION 3.22)

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

project(Test)

add_executable(main main.cc)

commands:

mkdir build
cmake ..

This will produce the compile_commands.json:

[
{
  "directory": "/home/hansljy/tmp/test/build",
  "command": "/usr/bin/c++    -o CMakeFiles/main.dir/main.cc.o -c /home/hansljy/tmp/test/main.cc",
  "file": "/home/hansljy/tmp/test/main.cc"
}
]

The compilation is correct, but vscode complains with red wavelines and the message above

[HighCommander4]

Likely clangd/clangd#1394, please see workarounds in this comment.

[HansLjy]

Not working. I have gcc 11.3.0 installed on Ubuntu 22.04 so the first 2 options won't apply. This is my configuration (~/.config/clangd/config.yaml):

CompileFlags:
  Add: --include-dir=/usr/include/c++/11

After I setup the above config, vscode stops complaining my iostream but it is not responding to my ctrl + click on the header file and it did not know what std:: is, pretty annoying.

[HansLjy]

Plus, it has no problems finding the C standard libs, but it cannot identify C++ libs

[HansLjy]

Sorry, but the query driver way works. Thanks for the comment. But I was wondering how can I make this setting universal? I currently set the vscode config for clangd but I would like other code editor to be aware of the --query-driver option

[HighCommander4]

Currently, --query-driver can only be set as a command-line argument to clangd, which are specified in your editor's configuration.

The reasons for this are security-related; there's some relevant discussion at clangd/clangd#539.