Clangd installation clarification

[Gerriko]

Description

I am seeking some clarification on the correct method to install clangd.

I refer to your page: https://github.com/eclipse-theia/theia-cpp-extensions/tree/d7d1adb9580dfe196670c0fbb1223ab13132222b/packages/cpp#setting-clangd-executable-path-and-arguments

On this page it instructs: To install Clangd on Ubuntu 18.04:

$ wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
$ echo "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic main" | sudo tee /etc/apt/sources.list.d/llvm.list
$ sudo apt-get update && sudo apt-get install -y clangd

Yet, if I go to https://clangd.llvm.org/installation.html page it informs me:

Installing the clangd package will usually give you a slightly older version.
Try to install the latest packaged release (9.0): sudo apt-get install clangd-9
This will install clangd as /usr/bin/clangd-9. Make it the default clangd:
sudo update-alternatives --install /usr/bin/clangd clangd /usr/bin/clangd-9 100

Ok, well the latest release is 10 so you can do the same for 10 as above for 9.

SO, I am a little confused. Does your method install version 10 or does it install an older version?

Additional Information

[Gerriko]

Nothing like diving in and trying it out anyway...
I see your install instructions installs version 11!

[marcdumais-work]

Hi @Gerriko,

Just a quick note in case you're not aware: @theia/cpp will be obsolete soon, like all theia-specific language extensions, following the deprecation of @theia/languages. This may seem like a bad news, but it's because our support for VS Code extensions is now good enough that we can safely use them.

For C/C++ we suggest using vscode-clangd, from the same project as clangd. One potentially interesting thing is that it can install clangd on startup (I haven't tested. Only a couple of vanilla platforms are supported, IIRC).

See for example this example app, where we have made the transition: https://github.com/theia-ide/theia-apps/blob/master/theia-cpp-docker/latest.package.json#L129

P.S. @theia/cpp-debug remains unafected by the above.