Cmake with CMake.CPM module

app1.cpp

#include <iostream>
#include <spdlog/spdlog.h>

#include <cppcodec/base32_crockford.hpp>
#include <cppcodec/base64_rfc4648.hpp>


int main(int argc, char** argv)
{
    SPDLOG_TRACE("Entering function");

    spdlog::info("Starting server OK.");

    spdlog::info("Received request from 192.168.10.1 at port 9090");
    spdlog::info("Sending response to client 192.168.100.1 connection ID 10");

    using base32 = cppcodec::base32_crockford;
    using base64 = cppcodec::base64_rfc4648;

    std::string secret = "SGVsbG8gd29ybGQgQ01ha2UgQ1BNIHdpdGggYmFzZTY0IGVuY29uZGluZy4=";
    
    std::vector<uint8_t> decoded = base64::decode(secret);
    std::string text(decoded.begin(), decoded.end());
    
    std::cout << " =>> Decoded text = " << text << std::endl; 

    SPDLOG_TRACE("Exit application");

    return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.9)
project(Simple_Cmake_Project)

#========== Global Configurations =============#
#----------------------------------------------#

set(CMAKE_CXX_STANDARD 17)     
set(CMAKE_VERBOSE_MAKEFILE ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# ------------ Download CPM CMake Script ----------------#

## Automatically donwload and use module CPM.cmake
file(DOWNLOAD https://raw.githubusercontent.com/TheLartians/CPM.cmake/v0.26.2/cmake/CPM.cmake
                 "${CMAKE_BINARY_DIR}/CPM.cmake")
include("${CMAKE_BINARY_DIR}/CPM.cmake")

#----------- Add dependencies --------------------------#

CPMAddPackage(
    NAME spdlog
    URL  "https://github.com/gabime/spdlog/archive/v1.3.1.zip"

    # -->> Only enable this, if the library does not use CMake.
    #      The library uses only Makefile, GNU autotools and so on.  
    #      In other words, does not have a CMakeLists.txt at root directory.
    # DOWNLOAD_ONLY YES
)

CPMAddPackage(
    NAME               cppcodec 
    GITHUB_REPOSITORY  tplgy/cppcodec 
    GIT_TAG            v0.2
    #VERSION            0.2 
    
    OPTIONS 
        "BUILD_TESTING OFF"
)
include_directories( ${cppcodec_SOURCE_DIR}/ )

message([TRACE] " spdlog source = ${spdlog_SOURCE_DIR} ")
message([TRACE] " cppcodec source = ${cppcodec_SOURCE_DIR} ")
     
#----------- Set targets -------------------------------#

add_executable(app1 app1.cpp)
target_link_libraries(app1 cppcodec spdlog::spdlog)