Can't compile Cmake application with llhttp library

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1

I have been trying to compile an application which requires the llhttp library, I’m currently using the following derivation file:

{
  stdenv,

  libuv,
  openssl,
  llhttp,
  zlib,
  cmake,
  pkg-config,

  fetchFromGitHub,
}:
stdenv.mkDerivation rec {
  version = "0.33.9";
  pname = "tlsuv";

  src = fetchFromGitHub {
    owner = "openziti";
    repo = "tlsuv";
    tag = "v${version}";
    hash = "sha256-um6aE0yK+lXfvaiKYugxavbXQRVm3mE+EeP6nuqYH8E=";
  };

  nativeBuildInputs = [
    cmake
    pkg-config
  ];

  buildInputs = [
    libuv
    openssl
    llhttp
    zlib
  ];
}

When building I get the following CMake error:

CMake Error in CMakeLists.txt:
  Imported target "llhttp::llhttp_static" includes non-existent path

    "/nix/store/fcfxn8y0fvdzkrcbfxr6a4fl5ixrr19y-llhttp-9.2.1/include"

  in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

  * The path was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and references files it does not
  provide.

I checked the llhttp-9.2.1-dev nix package and found the cmake file. If I’m understanding this correctly, it seems to have an error:
/nix/store/[…]-llhttp-9.2.1-dev/lib/cmake/llhttp/llhttp-config.cmake
(Snippet for brevity)

# The installation prefix configured by this project.
set(_IMPORT_PREFIX "/nix/store/fcfxn8y0fvdzkrcbfxr6a4fl5ixrr19y-llhttp-9.2.1")

# Create imported target llhttp::llhttp_shared
add_library(llhttp::llhttp_shared SHARED IMPORTED)

set_target_properties(llhttp::llhttp_shared PROPERTIES
  INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/include"
)

# Create imported target llhttp::llhttp_static
add_library(llhttp::llhttp_static STATIC IMPORTED)

set_target_properties(llhttp::llhttp_static PROPERTIES
  # PS: this points the regular llhttp package output, which doesn't contain any headers. 
  INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/include"
)

I’d greatly appreciate it, if someone more experienced with nix could tell me whether this is an bug in packaging, or if I’m understanding something incorrectly.

2

The packaging of llhttp in nixpkgs try to split outputs: nixpkgs/pkgs/by-name/ll/llhttp/package.nix at 06c3a28f6356830667387ca2e720140a06574106 · NixOS/nixpkgs · GitHub

But this does not work out of the box with this project, so this should either not be split, or be fixed.

Short term fast solution for you:

buildInputs = [
    libuv
    openssl
    (llhttp.overrideAttrs {outputs = ["out"];})
    zlib
  ];

I’ll open a PR to fix this in nixpkgs

3

for ref. : llhttp: don't split outputs by nim65s · Pull Request #398199 · NixOS/nixpkgs · GitHub

4

Thank you very much for your help!

5

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