vscode-clangd does not honor .clang-format-ignore.

[yong-li]

vscode settings used:

{
    "cmake.configureOnOpen": true
    "editor.formatOnSave": true,
    "editor.defaultFormatter": "llvm-vs-code-extensions.vscode-clangd"
}

Create a C++ source file.
Create a .clang-format-ignore file and add the source file path in it.
Edit the C++ source file.
Save the source file. The file is formatted on save.

Other than using the comment // clang-format off in code, is there a way for me to exclude certain files from being formatted on save?

[JVApen]

It seems that the .clang-format-ignore is a feature that is implemented specifically for clang-format exe rather than for libclang users.
The sources that I could find: https://github.com/llvm/llvm-project/blob/a60050cf1966eb8d46253c8da13df52ac8b9ec33/clang/tools/clang-format/ClangFormat.cpp#L588
This is the same file that contains the main function.

[JVApen]

I had a similar problem myself and I abused that clang-format supports multiple languages. If you can deduce the behavior from the filename, you can mark the file as cuda-cpp instead of regular c++. Once you have this distinction, you can use a language specific setting to enable the formatter for regular C++ and disable it for cuda-cpp.
In my case, this 5 minute change in the config solved the issue I had.