clangd can find the C++ standard library, but cannot call

[CodingOIer]

Version confirmation

• [x] Confirm

Following prerequisites

• [X] Confirm

Not a user config issue

• [X] Confirm

Neovim version

NVIM v0.10.2

Operating system/version

Windows 11

Terminal name/version

Windows Terminal 1.21.2991.0

$TERM environment variable

No response

Branch info

main (Default/Latest)

Fetch Preferences

SSH (use_ssh = true)

Affected language servers

clangd

How to reproduce the issue

1. Run the Windows configuration commands given in the README and install all dependencies
2. Edit a cpp file in a folder with .clangd. You can clone https://github.com/CodingOIer/Source-Code.git and go into the project root directory to get my environment.
3. Write a piece of C++ code

   #include <cstdio>
   int main()
   {
   int a, b;
   scanf("%d%d", &a, &b);
   printf("%d\n", a + b);
   return 0;
   }

4. He told me that I didn't call the functions in cstdio directly, and scanf and printf were not defined.
5. Trying to use the header file in C still prompts that it is not found.
6. Possibly useful information: LSP suggested std::scanf, but it doesn't actually work But clangd works fine on my VSCode

Actual behavior

The C++ standard library can be found, but cannot be called

Expected behavior

No response

Support info

Logs

[LSP Log](https://paste.ubuntu.com/p/FgGXwcV844/)

Additional information

No response

[CodingOIer]

My bad