Generate a compile_commands.json file

[Trass3r]

This would allow people to use choose clangd as the language server, get clang-tidy warnings in real-time and use other tools based on that json file. It could potentially simplify the clang-tidy integration too which currently calls the tool manually.

Generating one manually is possible via pio run -t compile_commands.json with:

compiledb.py:

Import("env")
env.Tool('compilation_db')
env.CompilationDatabase('compile_commands.json')

extra_scripts =
  pre:compiledb.py

But it would be great to have built-in support so it gets automatically (re-)generated only when the project setup changes (so tools like clangd don't have to restart all the time).

[Trass3r]

It could potentially simplify the clang-tidy integration too which currently calls the tool manually.

Thinking about it, how did that solve the problem of include paths hard-coded into the gcc cross compiler? Those are missing in the json file of course.

[jlmxyz]

sorry for my dumb questions, but I'm new to vscode and would REALLY try clangd use because cpptools aren't great... it often don't find the right symbols or definition... but I don't get what to do with compiledb.py, should I create this file into my source tree? and the extra_scripts, where should it go? tried to launch on console pio run* command given in the exemple, but it says that pio is not found thanks and regards

[arbrauns]

pio run -t compile_commands.json

This doesn't seem to work anymore, it gives me *** Do not know how to make File target `compile_commands.json' (...). Stop.. No other warnings, so I'm guessing the compiledb.py script is loaded correctly.

[arbrauns]

Looks like this is built into platformio somewhere somehow now, the script is no longer required and the command is pio run -t compiledb.