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I have an embedded C project, and want to read it in VSCode with clangd extension. I've built the project and generated compile_commands.json successfully with xmake/cmake. But clangd cannot find (cross compiler's) system headers using the generated compile_commands.json.

According to clangd documentation, I need to pass -isystem flag to clangd in compile_commands.json. I don't know how. The flags in "arguments" in compile_commands.json are passed to the cross compiler rather than clangd. Run clangd -isystem <path> results in "Unknown command line argument '-isystem'". Where should I add the -isystem flag?

Jackoo
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  • "arguments" in `compile_commands.json` is the right place. Clangd doesn't actually execute the commands in `compile_commands.json`, rather it uses them to guide how it should process the code. – HighCommander4 Dec 30 '22 at 20:08

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Did you tried to pass the -isystem flag to clangd in compile_commands.json by adding the following line to the command field of the relevant JSON object:

css

"-isystem/path/to/system/header/directory"

You can also pass multiple -isystem flags by adding multiple entries to the command field, as shown in the following example:

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"command": "clang++ -isystem/usr/include -isystem/path/to/other/header/directory file.cpp"

Note that the command field should contain the entire compiler command, including any flags or options you want to pass to clangd.

hehe xd
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