started changes

CMakeLists.txt

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+# CMakeLists.txt
+cmake_minimum_required(VERSION 3.15)
+project(ProjectEuler CXX)
+
+# Set C++ standard to C++23
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+# Use system default C++ compiler
+# set(CMAKE_CXX_COMPILER clang++)
+
+# Set compile flags
+set(CMAKE_CXX_FLAGS_DEBUG "-g -O0 -Wall -Wextra")
+set(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG -Wall -Wextra")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++23 -fPIC")
+
+# Find required packages
+find_package(PkgConfig REQUIRED)
+find_package(Threads REQUIRED)
+
+# Include directories
+include_directories(${CMAKE_SOURCE_DIR}/include)
+
+# Add spdlog as a subdirectory
+add_subdirectory(external/spdlog)
+
+# Find all cpp files in src directory
+file(GLOB_RECURSE ALL_SOURCE_FILES "src/*.cpp")
+
+# Separate main files from other source files
+set(NON_MAIN_SOURCE_FILES "")
+set(MAIN_SOURCE_FILES "")
+
+foreach(file ${ALL_SOURCE_FILES})
+    # Check if file name contains 'main'
+    if(file MATCHES ".*main.*\\.cpp$")
+        list(APPEND MAIN_SOURCE_FILES ${file})
+    else()
+        list(APPEND NON_MAIN_SOURCE_FILES ${file})
+    endif()
+endforeach()
+
+# Create a library from non-main source files
+if(NON_MAIN_SOURCE_FILES)
+    add_library(project_euler_lib ${NON_MAIN_SOURCE_FILES})
+    target_link_libraries(project_euler_lib spdlog::spdlog)
+    target_compile_features(project_euler_lib PRIVATE cxx_std_23)
+endif()
+
+# Create executables from main files
+foreach(file ${MAIN_SOURCE_FILES})
+    # Get the filename without extension
+    get_filename_component(EXEC_NAME ${file} NAME_WE)
+    
+    # Create executable with project prefix
+    set(FINAL_EXEC_NAME "ProjectEuler_${EXEC_NAME}")
+    add_executable(${FINAL_EXEC_NAME} ${file})
+    
+    # Link the library to executable (if it exists)
+    if(NON_MAIN_SOURCE_FILES)
+        target_link_libraries(${FINAL_EXEC_NAME} project_euler_lib)
+    endif()
+    
+    # Link spdlog library
+    target_link_libraries(${FINAL_EXEC_NAME} spdlog::spdlog)
+    
+    # Set compile features
+    target_compile_features(${FINAL_EXEC_NAME} PRIVATE cxx_std_23)
+endforeach()