add_executable(day1 main.cpp)
set_target_properties(day1 PROPERTIES CXX_STANDARD 23 CXX_STANDARD_REQUIRED ON)
# Use GCC 15's libstdc++ with Clang 21
target_compile_options(day1 PRIVATE --gcc-toolchain=/usr)

add_custom_command(TARGET day1 POST_BUILD
    COMMAND ${CMAKE_COMMAND} -E copy
    ${CMAKE_CURRENT_SOURCE_DIR}/day1_input
    $<TARGET_FILE_DIR:day1>/day1_input
    COMMENT "Copying day1_input to build directory"
)