35 lines
1.1 KiB
Markdown
35 lines
1.1 KiB
Markdown
+++
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title = "Clangd in Nix"
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date = 2022-03-03
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tags = ["nixos"]
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+++
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I've been using [Nix][NixOS] a lot recently since it handles dependency
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management very cleanly, but one gripe that I've been having is that when I'm
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doing C/C++ development work using `nix develop`, all my dependencies are
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actually in the Nix store in `/nix`, so my [clangd] editor plugin won't be able
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to find them.
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Fortunately, clangd supports looking for a file called `compile_commands.json`,
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which describes the compilation commands used for each file, with absolute paths
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for all dependencies.
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For [CMake]-based projects, there's an option to dump this information
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automatically into the build directory, which I typically then symlink into my
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project's root directory for my editor to find and apply to my files. Here's the
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snippet:
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```cmake
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# Generate the `compile_commands.json` file.
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set(CMAKE_EXPORT_COMPILE_COMMANDS ON CACHE INTERNAL "")
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if(CMAKE_EXPORT_COMPILE_COMMANDS)
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set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES
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${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES})
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endif()
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```
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[NixOS]: https://nixos.org/
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[clangd]: https://clangd.llvm.org/
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[CMake]: https://cmake.org/
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