cmake fails for examples/Console: "examples/Console/sioclientConfig.cmake.in does not exist."

[Paul-Andre]

I am using WSL Ubuntu 24.04.2 LTS on Windows 11.

I followed the "With CMake" installation instructions as described here: https://github.com/socketio/socket.io-client-cpp/blob/da779141a7379cc30c870d48295033bc16a23c66/INSTALL.md#with-cmake

I am on commit da77914

I try to build the examples/Console example using cmake. It is telling me examples/Console/sioclientConfig.cmake.in is missing.

paul@DESKTOP-E3P2CL2:~/Programming/generals.io/socket.io-client-cpp/examples/Console$ cmake --version
cmake version 3.28.3

CMake suite maintained and supported by Kitware (kitware.com/cmake).
paul@DESKTOP-E3P2CL2:~/Programming/generals.io/socket.io-client-cpp/examples/Console$ mkdir build
paul@DESKTOP-E3P2CL2:~/Programming/generals.io/socket.io-client-cpp/examples/Console$ cd build/
paul@DESKTOP-E3P2CL2:~/Programming/generals.io/socket.io-client-cpp/examples/Console/build$ cmake ..
CMake Warning (dev) in CMakeLists.txt:
  No project() command is present.  The top-level CMakeLists.txt file must
  contain a literal, direct call to the project() command.  Add a line of
  code such as

    project(ProjectName)

  near the top of the file, but after cmake_minimum_required().

  CMake is pretending there is a "project(Project)" command on the first
  line.
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) in CMakeLists.txt:
  cmake_minimum_required() should be called prior to this top-level project()
  call.  Please see the cmake-commands(7) manual for usage documentation of
  both commands.
This warning is for project developers.  Use -Wno-dev to suppress it.

-- The C compiler identification is GNU 13.3.0
-- The CXX compiler identification is GNU 13.3.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Deprecation Warning at CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.5 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
-- Setting build type to 'Release' as none was specified.
-- Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY OPENSSL_INCLUDE_DIR)
CMake Error: File /home/paul/Programming/generals.io/socket.io-client-cpp/examples/Console/sioclientConfig.cmake.in does not exist.
CMake Error at /usr/share/cmake-3.28/Modules/CMakePackageConfigHelpers.cmake:344 (configure_file):
  configure_file Problem configuring file
Call Stack (most recent call first):
  /home/paul/Programming/generals.io/socket.io-client-cpp/CMakeLists.txt:155 (configure_package_config_file)
  CMakeLists.txt:3 (include)


CMake Error at /home/paul/Programming/generals.io/socket.io-client-cpp/CMakeLists.txt:176 (add_subdirectory):
  add_subdirectory given source "test" which is not an existing directory.
Call Stack (most recent call first):
  CMakeLists.txt:3 (include)


--
-- Configuring incomplete, errors occurred!

I also tried running cmake directly in the examples/Console directory (without cd build) and the same thing happens.

[Paul-Andre]

Ok, so the solution is to simply remove the line include(${CMAKE_CURRENT_SOURCE_DIR}/../../CMakeLists.txt) from examples/Console/CMakeLists.txt and it works.