Feature Request: Generate compile_commands.json

[derdrdirk]

I am using emacs with lsp-mode and clangd language server. For code completion the language server need an compile_commands.json file, which can be produced by cmake.

• compile_commands.json definition
• How to produce compile_commands.json with cmake

I would love to see a command similar to pio init --ide emacs that produces a compile_commands.json instead of a .clang_complete file, which I need for Intellisense.

[ivankravets]

See 7a07a2e

Could you re-test with pio upgrade --dev?

[derdrdirk]

I did and noticed that you produce an additional .ccls file, which is used by the ccls language server. Unfortunately cland, the language server of the llvm developers, uses a ‘.compile_commands.json’ file

[ivankravets]

How are you going to use clang with compile_commands.json when it's not compatible with GCC flags and other architecture features? It will fail, just try it for AVR.

[derdrdirk]

Haha. Actually I just want the intellisense to work with cland. For compilation I just the pio pipeline.

[ivankravets]

Yes, but clang C/C++ Preprocessor will not understand your GCC code. You actually need clang_complete and we generate it https://github.com/platformio/platformio-core/blob/develop/platformio/ide/tpls/emacs/.clang_complete.tpl

[derdrdirk]

You don’t get me. The .clang_complete file is not read by the cland language server, which is the default language server for the emacs lsp-mode. It’s like the .ccls file for the ccls language server 😉
Anyways thanks for your quick responses. Keep up the good work.

[nghialm269]

@ivankravets:
Hi, can this issue be re-opened?
Each C++ language servers support its own compile-flag file:

• For ccls, it is .ccls (which PIO generates)
• For clangd, it is compile_flags.txt
• For cquery, it is .cquery

But all of them support compile_commands.json (ccls, clangd, cquery) , so if you can generate compile_commands.json, we can use PIO with any cpp lsp we want, instead of generating .ccls file which only works for ccls.

[ivankravets]

Please re-test with pio upgrade --dev

See docs https://docs.platformio.org/en/latest/faq.html#compilation-database-compile-commands-json