Using cmake to build nmos cpp error

[gl0522]

What is your question?

Hi!

• When compiling the nmos-cpp source code using cmake .. on Ubuntu 22.04 system, the following error occurs:

CMake Error: CMAKE_PROJECT_TOP_LEVEL_INCLUDES file does not exist: third_party/cmake/conan_provider.cmake
CMake Error at Development/third_party/cmake/conan_provider.cmake:590 (cmake_language):
  cmake_language Dependency providers can only be set as part of the first
  call to project().  More specifically,
  cmake_language(SET_DEPENDENCY_PROVIDER) can only be called while the first
  project() command processes files listed in
  CMAKE_PROJECT_TOP_LEVEL_INCLUDES.
Call Stack (most recent call first):
  CMakeLists.txt:25 (include)
`

`The configuration of the cmake configuration file CMakeLists.txt is as follows:``

project(nmos-cpp)

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/Development/cmake")

set(CMAKE_PROJECT_TOP_LEVEL_INCLUDES "${CMAKE_BINARY_DIR}/third_party/cmake/conan_provider.cmake")

#if(CMAKE_PROJECT_TOP_LEVEL_INCLUDES)
#  cmake_minimum_required(VERSION 3.24 FATAL_ERROR)
#    else()
#       cmake_minimum_required(VERSION 3.17 FATAL_ERROR)
#    endif()
    #cmake_minimum_required(VERSION 3.17 FATAL_ERROR)
# project name
if(CMAKE_PROJECT_TOP_LEVEL_INCLUDES)
        #Include the specified file for Conan configuration or other setup
                        include(${CMAKE_PROJECT_TOP_LEVEL_INCLUDES})
                endif()

#project(nmos-cpp)

enable_language(CXX)
# enable or disable the example applications
set(NMOS_CPP_BUILD_EXAMPLES ON CACHE BOOL "Build example applications")

# enable or disable the unit test suite
set(NMOS_CPP_BUILD_TESTS ON CACHE BOOL "Build test suite application")

# enable or disable the LLDP support library (lldp)
# and its additional dependencies
set(NMOS_CPP_BUILD_LLDP OFF CACHE BOOL "Build LLDP support library")
mark_as_advanced(FORCE NMOS_CPP_BUILD_LLDP)

# common config
include(${CMAKE_SOURCE_DIR}/Development/cmake/NmosCppCommon.cmake)

# nmos-cpp dependencies
include(${CMAKE_SOURCE_DIR}/Development/cmake/NmosCppDependencies.cmake)

# nmos-cpp libraries
include(${CMAKE_SOURCE_DIR}/Development/cmake/NmosCppLibraries.cmake)

if(NMOS_CPP_BUILD_EXAMPLES)
    # nmos-cpp-node executable
    include(${CMAKE_SOURCE_DIR}/Development/cmake/NmosCppNode.cmake)

    # nmos-cpp-registry executable
    include(${CMAKE_SOURCE_DIR}/Development/cmake/NmosCppRegistry.cmake)
endif()

if(NMOS_CPP_BUILD_TESTS)
    # nmos-cpp-test executable
    include(${CMAKE_SOURCE_DIR}/Development/cmake/NmosCppTest.cmake)
endif()

# export the config-file package
include(${CMAKE_SOURCE_DIR}/Development/cmake/NmosCppExports.cmake)

Do you have any advise?

Have you read the CONTRIBUTING guide?

• I've read the CONTRIBUTING guide

[memsharded]

Hi @gl0522

The

set(CMAKE_PROJECT_TOP_LEVEL_INCLUDES "${CMAKE_BINARY_DIR}/third_party/cmake/conan_provider.cmake")

can't and must not be added to the CMakeLists.txt. It is intended to be provided externally, because they need to run before the call to project(). So this has to be defined in:

• The command line as -DVAR=VALUE
• In a CMake presets file.

If you check the documentation of https://github.com/conan-io/cmake-conan, you will see example how to define it in command line.