Can't clangd in cmake (already enabled export compile command) work
out of the box?
reddit / emacs

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npchitman · 2022-04-19 12:24

[SOLVED] also discussed in
[here](https://github.com/clangd/clangd/discussions/1113)

In my emacs, I use `lsp-emacs`  + `clangd`, there are so many clangd
error outputs but it can compile success, there's also happened in
other projects. And when I use clion with clangd these errors are just
gone and the syntax check outputs are the same as compiler compilation
output.

These are my operations when I get starting with a project:
`cmake -B build -DCMAKE_EXPORT_COMPILE_COMMAND=YES
-DCMAKE_BUILD_TYPE=Debug && ln -s build/compile_command.json .`.

Are there any operations and configurations I missed?

here's my [collected info](https://gist.github.com/K1ngst0m/ecc9d11860
cc066e7d5b6a79d4dd4844) following the [troubleshooting
guide](https://emacs-lsp.github.io/lsp-mode/page/troubleshooting/)

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fatnerdfromnextdoor · 2022-04-19 13:29

Same thing for me with VScode having much less errors(compiles fine).

I heard, that many language servers get overwhelmed with hacky,custom
builds(which it is) so I stopped trying.

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ram535 · 2022-04-19 16:33

The other day I was trying to configure lsp-mode, clangd and cmake.

And this worked for me. Run this commands in the root of the project.

- cmake -S . -B build
- cmake --build build
- cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON build

You do not need to symbolic link the `compile_caommand.json`  file.
`lsp-mode` will look for it in the `build/` directory by default.

Sometimes you have to restart `lsp-mode` with the command `lsp-
workspace-restart`.

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npchitman · 2022-04-19 16:46

Sometimes I need to generate build directory such as
build_platform/{debug,release}/xxx and that will cause
`compile_command.json` not found without linking and I haven't
understood how it works. Thanks for your tips.

But I tried your command and I thought that works the same as mine
(same result with many errors in clangd which the compiler is working
just fine).

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amanol · 2022-04-19 16:57

Check the [clangd system
headers](https://clangd.llvm.org/guides/system-headers) guide on how
to handle some error cases. The guide is quite detailed on those
cases.

This is the most common issue I used to  have.

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npchitman · 2022-04-20 01:34

ok, thanks for your help

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KonpakuYoumu · 2022-04-20 08:07

`CMAKE_EXPORT_COMPILE_COMMANDS`.

The last `s` is missing in your command.

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fatnerdfromnextdoor · 2022-05-09 20:27

This helped me: https://github.com/nickdiego/compiledb