find_package for Interface library

Code
1

Hello,

I have written a simple package with only one header file. Currently I’m trying to fetch my library from directory and then add it using find_package. In addition, I’m unable to install directory of header file in _deps directory (to be honest I’m not sure it’s needed or is a good practice). Below is the tree directory of the project and then the code of the `CMakeLists’ file.

├── cmake
│   └── utilsConfig.cmake.in
├── CMakeLists.txt
└── include
    ├── headers.hpp
    └── utilities.hpp

code:

cmake_minimum_required(VERSION 3.25)
project(utils)

include(CMakePackageConfigHelpers)
include(GNUInstallDirs) 

add_library(utils INTERFACE)
add_library(libutils::utils ALIAS utils)

target_include_directories(utils INTERFACE 
  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
)

install(TARGETS utils
  EXPORT ${PROJECT_NAME}Targets                                                              
  INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}                                           
)                                                                                            
                                                                                                                                                                               
install(DIRECTORY include/                                                                         
  TYPE INCLUDE
)

set(configFile ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake)
set(versionFile ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake)
set(configInstallDestination ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})

configure_package_config_file(
  ${CMAKE_CURRENT_SOURCE_DIR}/cmake/utilsConfig.cmake.in
  ${configFile}
  INSTALL_DESTINATION ${configInstallDestination}
)

write_basic_package_version_file(
  "${versionFile}"
  COMPATIBILITY SameMajorVersion
)

install(FILES
    "${configFile}"
    "${versionFile}" 
  DESTINATION
    ${configInstallDestination}
)

install(EXPORT ${PROJECT_NAME}Targets
  NAMESPACE libutils::
  DESTINATION ${configInstallDestination}
)

Here is the directory tree of project in which I’m trying to find_package:

├── CMakeLists.txt
├── test.cpp
└── thirdparty
    └── libutils

and code of CMakeLists:

cmake_minimum_required(VERSION 3.23)
project(Test)

include(FetchContent)
FetchContent_Declare(
        utils
        SOURCE_DIR "${CMAKE_SOURCE_DIR}/thirdparty/libutils/"
)

FetchContent_MakeAvailable(libutils)
find_package(utils)

add_executable(Test test.cpp)
target_link_libraries(Test PUBLIC libutils::utils)

I want to mention that I can include utilities.hpp in test.cpp thanks to INCLUDES DESTINATION command. But for some reason CMake cannot find package.

2

I got everything mixed up. I have started reading @craig.scott’s great book and things are becoming clearer to me.

The topic can be closed or removed :slight_smile: