update nix-dev

content/blog/nix-dev/index.md

@@ -259,6 +259,8 @@ pkgs.mkShell {
 Some packages may come with different outputs. When you search in https://search.nixos.org , you will see at least `out`, and `dev` if the packages contains headers. If you add simply `pkgs.my-awesome-library` to `packages = []`, nix should figure out that you want `pkgs.my-awesome-library.dev`, but you can also type it manually.
 {{</ alert >}}
 
+### Hardening
+
 Nixpkgs add some compiler flags by default as part of the hardening profile. You can read more about it in the [manual section](https://nixos.org/manual/nixpkgs/stable/#sec-hardening-in-nixpkgs). Although for a devshell, you may want to turn off all these default flags, so you get a better debugging experience:
 
 ```nix
@@ -267,6 +269,18 @@ pkgs.mkShell {
 }
 ```
 
+### Language server
+
+For your editor to pick up the C/C++ libraries which rely on pkg-config or cmake, I've had success with the following stack:
+
+- Tell cmake or meson to generate a `compile_commands.json`. For cmake, you need to add `set(CMAKE_EXPORT_COMPILE_COMMANDS ON)` to your `CMakeLists.txt` or by passing `-DCMAKE_EXPORT_COMPILE_COMMANDS=1`. Meson should generate them automatically.
+- Install clangd, by adding `clang-tools` to your devshell.
+- Configure your editor to use clangd. For example, for vscode: uninstall the Microsoft C/C++ extension and install the clangd extension.
+- Make sure clangd finds your `compile_commands.json`, by either:
+  - Creating a symlink of the file from your build directory into your root directory (easiest).
+  - Configure your editor extension to pass the flag `--compile-commands-dir=<directory>` to clangd. For vscode, add `"clangd.arguments": ["--compile-commands-dir=<directory>"]` to your project's `.vscode/settings.json` .
+- You may need to restart the editor for the changes to propagate.
+
 ## NodeJS
 
 Unlike C/C++, NodeJS is quite straightfoward. While most things will be handled by your editor, you might want to open a quick shell to make certain packages available to yourself. The packages below are generally universal, but certain frameworks (i.e Svelte or NextJS) may require additional packages to be added to the shell.