Opentelemetry dependency in a cpp project help

[mohnishkodnani]

Hi,
I am trying to use project level flake.nix to configure a cpp project and need to add opentelemetry-cpp as a dependency. My flake.nix file looks like follows:

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    nix-vscode-extensions.url = "github:nix-community/nix-vscode-extensions";
    nix-vscode-extensions.inputs.nixpkgs.follows = "nixpkgs";
  };
  outputs = {self, nixpkgs, flake-utils, nix-vscode-extensions, ...} @inputs: 
    flake-utils.lib.eachSystem ["x86_64-linux" "aarch64-darwin" "x86_64-darwin"] (system:
    let 
      pkgs = import nixpkgs {
        inherit system;
        config.allowUnfree = true;
      };
      extensions = nix-vscode-extensions.extensions.${system}; 
      my-cmake-tools = extensions.vscode-marketplace.ms-vscode.cmake-tools.overrideAttrs (_: {sourceRoot = "extension";});
      custom-vscode-extensions = builtins.attrValues {
        inherit (extensions.vscode-marketplace.redhat) vscode-yaml;
        inherit (extensions.vscode-marketplace.ms-vscode) vscode-typescript-tslint-plugin;
        inherit (extensions.vscode-marketplace.ms-python) python;
        inherit (extensions.vscode-marketplace.tamasfe) even-better-toml;
        inherit (extensions.vscode-marketplace.vadimcn) vscode-lldb;
        inherit (extensions.vscode-marketplace.llvm-vs-code-extensions) vscode-clangd;
        inherit (extensions.vscode-marketplace.bbenoist) nix;
        inherit (extensions.vscode-marketplace.twxs) cmake;
        inherit (extensions.vscode-marketplace.mkhl) direnv;
        inherit (extensions.vscode-marketplace.github) copilot github-vscode-theme copilot-chat;
        inherit (extensions.vscode-marketplace.vscodevim) vim;
        inherit(extensions.vscode-marketplace.tdennis4496) cmantic;
        inherit my-cmake-tools;
      };
      codium = 
        let
         inherit (pkgs) vscode-with-extensions vscodium vscodium-fhs;
        in (vscode-with-extensions.override {
          vscode = vscodium;
          vscodeExtensions = custom-vscode-extensions;
        });
      shellHook = ''
        echo -e "Welcome to  Shell\nCMake Version: $(cmake -version)\nCompiler: $CC\nCompiler Version: $($CC -v 2>&1)"
      '' 
      + (if pkgs.stdenv.hostPlatform.isDarwin then 
      ''
        export MACOSX_DEPLOYMENT_TARGET=14.0
        # do not use nixpkgs provided core foundation
        export NIX_COREFOUNDATION_RPATH=/System/Library/Frameworks
        # magic speedup pony :facepalm:
        #
        # nix has the ugly habbit of duplicating ld flags more than necessary.  This
        # somewhat consolidates this.
        export NIX_LDFLAGS=$(for a in $NIX_LDFLAGS; do echo $a; done |sort|uniq|xargs)
        export NIX_LDFLAGS_FOR_TARGET=$(for a in $NIX_LDFLAGS_FOR_TARGET; do echo $a; done |sort|uniq|xargs)
        export NIX_LDFLAGS_FOR_TARGET=$(comm -3 <(for l in $NIX_LDFLAGS_FOR_TARGET; do echo $l; done) <(for l in $NIX_LDFLAGS; do echo $l; done))
        # drop curses from the LDFLAGS, we really want the system ones, not the nix ones.
        export NIX_LDFLAGS=$(for lib in $NIX_LDFLAGS; do case "$lib" in *curses*);; *) echo -n "$lib ";; esac; done;)
        # unconditionally add the MacOSX.sdk
        export NIX_LDFLAGS="-L/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib $NIX_LDFLAGS"
      ''
      else '''');
      nativeBuildInputs = with pkgs; [
        cmake
        ninja
        pkg-config
        doxygen
        prometheus-cpp
#        opentelemetry-cpp
        (opentelemetry-cpp.overrideAttrs(oldAttrs: rec {
          version = "1.14.2";
          src = fetchFromGitHub {
            owner = "open-telemetry";
            repo = "opentelemetry-cpp";
            rev = "v${version}";
            sha256 = "sha256-jLRUpB9aDvxsc7B42b08vN2rygN/ycgOyt78i2Hms0Q=";
          };
          cmakeFlags = oldAttrs.cmakeFlags ++ [
            "-DWITH_ABSEIL=OFF"
            "-DBUILD_SHARED_LIBS=OFF"
            "-DBUILD_TESTING=OFF"
            "-DCMAKE_CXX_STANDARD=20"
            "-DCMAKE_POSITION_INDEPENDENT_CODE=TRUE" 
            "-DWITH_STL=ON"
            "-DWITH_PROMETHEUS=ON"
            "-DWITH_BENCHMARK=OFF"
            "-DWITH_OTLP_GRPC=OFF"
            "-DWITH_OTLP_HTTP=OFF"
          ];
        }))
        curl # needed by prometheus
        fmt
      ];
    in
      rec {
        metric_lib = (with pkgs; llvmPackages_16.stdenv.mkDerivation rec {
          pname = "metric_lib";
          name = pname;
          version = "0.0.0";
          src = self;
          cmakeFlags = [
            "-DCMAKE_EXPORT_COMPILE_COMMANDS=ON"
            "-DCMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES=1"
          ];
          inherit nativeBuildInputs;
        });
        defaultPackage = metric_lib;
        devShells = {
          libEnv = pkgs.mkShell {
            inherit nativeBuildInputs;
            inherit shellHook;

            buildInputs = with pkgs; [ # things that should exist at runtime
              graphviz
              mas
              jq
              shellcheck
              codium
            ];
          }; 
          default = devShells.libEnv;
        };
      }
    );
}

The current version in nixpkgs is 1.13.0 and i wanted to use 1.14.2 the latest but after overrides I get an error during cmake.

The error

-- The CXX compiler identification is Clang 16.0.6
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /nix/store/24ljvc5iwbs01svv9s8zvfcl5qs876kp-clang-wrapper-16.0.6/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE  
-- Found LibDl: /nix/store/p4dv7f7icpnwf3zflxyq76k1pybm895q-libSystem-11.0.0/lib/libdl.tbd  
-- Found ZLIB: /nix/store/82i7jfq9lgbpvbkcm0wraxnyrjxirka8-zlib-1.3.1/lib/libz.dylib (found version "1.3.1")  
-- Found CURL: /nix/store/sjd48k88anskbjaw5q6cwrv2hsnpasgh-curl-8.6.0/lib/libcurl.dylib (found version "8.6.0")  
-- Found opentelemetry-cpp: /nix/store/qmgfdqgmcijn54xlryzx2pk0xvf8gfgj-opentelemetry-cpp-1.14.2-dev/include  
-- Configuring done (2.2s)
CMake Error in opentelemetry/CMakeLists.txt:
  Imported target "opentelemetry-cpp::api" includes non-existent path

    "/nix/store/gsh6k7dyhy7x9k20rcyzr2klzf27bfa2-opentelemetry-cpp-1.14.2/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.



CMake Error in opentelemetry/CMakeLists.txt:
  Imported target "opentelemetry-cpp::api" includes non-existent path

    "/nix/store/gsh6k7dyhy7x9k20rcyzr2klzf27bfa2-opentelemetry-cpp-1.14.2/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.



CMake Error at /nix/store/qmgfdqgmcijn54xlryzx2pk0xvf8gfgj-opentelemetry-cpp-1.14.2-dev/lib/cmake/opentelemetry-cpp/opentelemetry-cpp-target.cmake:120 (set_target_properties):
  The link interface of target "opentelemetry-cpp::http_client_curl"
  contains:

    CURL::libcurl

  but the target was not found.  Possible reasons include:

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.

Call Stack (most recent call first):
  /nix/store/qmgfdqgmcijn54xlryzx2pk0xvf8gfgj-opentelemetry-cpp-1.14.2-dev/lib/cmake/opentelemetry-cpp/opentelemetry-cpp-config.cmake:88 (include)
  opentelemetry/CMakeLists.txt:2 (find_package)


CMake Error at /nix/store/qmgfdqgmcijn54xlryzx2pk0xvf8gfgj-opentelemetry-cpp-1.14.2-dev/lib/cmake/opentelemetry-cpp/opentelemetry-cpp-target.cmake:156 (set_target_properties):
  The link interface of target "opentelemetry-cpp::prometheus_exporter"
  contains:

    prometheus-cpp::pull

  but the target was not found.  Possible reasons include:

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.

Call Stack (most recent call first):
  /nix/store/qmgfdqgmcijn54xlryzx2pk0xvf8gfgj-opentelemetry-cpp-1.14.2-dev/lib/cmake/opentelemetry-cpp/opentelemetry-cpp-config.cmake:88 (include)
  opentelemetry/CMakeLists.txt:2 (find_package)


CMake Error at /nix/store/qmgfdqgmcijn54xlryzx2pk0xvf8gfgj-opentelemetry-cpp-1.14.2-dev/lib/cmake/opentelemetry-cpp/opentelemetry-cpp-target.cmake:172 (set_target_properties):
  The link interface of target
  "opentelemetry-cpp::elasticsearch_log_record_exporter" contains:

    nlohmann_json::nlohmann_json

  but the target was not found.  Possible reasons include:

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.

Call Stack (most recent call first):
  /nix/store/qmgfdqgmcijn54xlryzx2pk0xvf8gfgj-opentelemetry-cpp-1.14.2-dev/lib/cmake/opentelemetry-cpp/opentelemetry-cpp-config.cmake:88 (include)
  opentelemetry/CMakeLists.txt:2 (find_package)

The path that is listed in the cmake output Found opentelemetry -> /nix/store/qmgfdqgmcijn54xlryzx2pk0xvf8gfgj-opentelemetry-cpp-1.14.2-dev/ has include files and a lib folder that only contains cmake and pkgconfig folders, but no actual libs files.

The libs are installed in /nix/store/gsh6k7dyhy7x9k20rcyzr2klzf27bfa2-opentelemetry-cpp-1.14.2/lib/ notice this does not have the -dev suffix to the path.

I cannot figure out how to fix this issue.
I looked inside one of the cmake config files vi /nix/store/qmgfdqgmcijn54xlryzx2pk0xvf8gfgj-opentelemetry-cpp-1.14.2-dev/lib/cmake/opentelemetry-cpp/opentelemetry-cpp-config.cmake

and I notice that 2 variables get set like this

set_and_check(OPENTELEMETRY_CPP_INCLUDE_DIRS "/nix/store/qmgfdqgmcijn54xlryzx2pk0xvf8gfgj-opentelemetry-cpp-1.14.2-dev/include")
set_and_check(OPENTELEMETRY_CPP_LIBRARY_DIRS "${PACKAGE_PREFIX_DIR}/lib")

The include directory has a path while the lib is on a different path due to this variable PACKAGE_PREFIX_DIR
A Sample CmakeLists.txt for this

find_package(opentelemetry-cpp CONFIG REQUIRED)
   3   │ file(GLOB SOURCES "src/*.cpp")
   4   │ 
   5   │ add_library(metrics_opentelemetry ${SOURCES})
   6   │ 
   7   │ target_include_directories(metrics_opentelemetry PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include ${OPENTELEMETR
       │ Y_CPP_INCLUDE_DIRS})
   8   │ 
   9   │ target_link_libraries(metrics_opentelemetry PUBLIC common ${OPENTELEMETRY_CPP_LIBRARIES})
  10   │ set_target_properties(metrics_opentelemetry PROPERTIES LINKER_LANGUAGE CXX)

Not sure if someone can help figure out what is different in my settings to cause this.