[C++] Configuring the CPR library in cmake

Challenges
1

I’m stuck on Stage #(6) for clone. It is more a question about CMake itself but this is the first time I needed to make HTTP request.

I’ve tried different things related to this PR request cpr-config.cmake for find_package · Issue #455 · libcpr/cpr. But it always still doesn’t work.

I locally don’t run CMake as I have windows and work on .vcxproj prjects.
So I just did vcpkg integrate install and I was already ready to work with all the libraries I added in the vcpkg.json.

Here are my (parts) of the logs from the server, :

remote: [compile] CMake Error at /vcpkg/scripts/buildsystems/vcpkg.cmake:894 (_find_package):
remote: [compile]   By not providing "FindCPR.cmake" in CMAKE_MODULE_PATH this project has
remote: [compile]   asked CMake to find a package configuration file provided by "CPR", but
remote: [compile]   CMake did not find one.
remote: [compile]
remote: [compile]   Could not find a package configuration file provided by "CPR" with any of
remote: [compile]   the following names:
remote: [compile]
remote: [compile]     CPRConfig.cmake
remote: [compile]     cpr-config.cmake
remote: [compile]
remote: [compile]   Add the installation prefix of "CPR" to CMAKE_PREFIX_PATH or set "CPR_DIR"
remote: [compile]   to a directory containing one of the above files.  If "CPR" provides a
remote: [compile]   separate development package or SDK, be sure it has been installed.
remote: [compile] Call Stack (most recent call first):
remote: [compile]   CMakeLists.txt:18 (find_package)

And here’s CMakeLists.txt:


# Minimum required version of CMake
cmake_minimum_required(VERSION 3.20)

# Project name and settings
project(git-starter-cpp)

set(CMAKE_CXX_STANDARD 23) # Enable the C++23 standard

# Add path for custom Find modules
set(CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake" ${CMAKE_MODULE_PATH})

# Set options if needed (e.g., USE_SYSTEM_GTEST)
set(USE_SYSTEM_GTEST ON CACHE BOOL "Use system-installed GTest")

# Locate dependencies
find_package(OpenSSL REQUIRED)
find_package(ZLIB REQUIRED)
find_package(CPR REQUIRED)

# Include directories provided by dependencies
include_directories(${CPR_INCLUDE_DIRS})

# Source files globbing (adjust paths as needed)
file(GLOB_RECURSE SOURCE_FILES src/*.cpp src/*.hpp)

# Define executable target and link libraries
add_executable(git ${SOURCE_FILES})
target_link_libraries(git PRIVATE OpenSSL::Crypto ZLIB::ZLIB ${CPR_LIBRARIES})

And also the findcpr.cmake I found here Findcpr.cmake 

find_path(cpr_INCLUDE_DIR
  NAMES cpr.h
  PATH_SUFFIXES cpr
)
find_library(cpr_LIBRARY
  NAMES cpr
  )

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(cpr
  FOUND_VAR cpr_FOUND
  REQUIRED_VARS
    cpr_LIBRARY
    cpr_INCLUDE_DIR
)
if(cpr_FOUND AND NOT TARGET cpr::cpr)
  add_library(cpr::cpr UNKNOWN IMPORTED)
  set_target_properties(cpr::cpr PROPERTIES
    IMPORTED_LOCATION "${cpr_LIBRARY}"
    INTERFACE_INCLUDE_DIRECTORIES "${cpr_INCLUDE_DIR};${cpr_INCLUDE_DIR}/.."
    )
  message(STATUS "cpr include dir: ${cpr_INCLUDE_DIR}")
endif()

Maybe someone that has used cpr library can help?
Thanks in Advance.

4

Hey @ahhmed-hassan, mind giving this a try?

find_package(cpr CONFIG REQUIRED)
target_link_libraries(git PRIVATE cpr::cpr)

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6

Hi @andy1li !
Thank your for answering.
It is my mistake not to state that I have tried that already at first but sadly was no success and gave the exact same error output from the server.

7

@ahhmed-hassan Would you mind trying again using lowercase cpr instead of CPR?

find_package(cpr CONFIG REQUIRED)
8

@andy1li
Thank you for replying.
It has finally worked!
I would never had though that the solution would be that simple haha.

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