How to capture CMake command line arguments?

Question

I want to record the arguments passed to cmake in my generated scripts. E.g., \"my-config.in\" will be processed by cmake, it has definition like this:

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Answer 1

A very Linux specific way of achieving the same objective:

if(${CMAKE_SYSTEM_NAME} STREQUAL Linux)
    file(STRINGS /proc/self/status _cmake_process_status)

    # Grab the PID of the parent process
    string(REGEX MATCH "PPid:[ \t]*([0-9]*)" _ ${_cmake_process_status})

    # Grab the absolute path of the parent process
    file(READ_SYMLINK /proc/${CMAKE_MATCH_1}/exe _cmake_parent_process_path)

    # Compute CMake arguments only if CMake was not invoked by the native build
    # system, to avoid dropping user specified options on re-triggers.
    if(NOT ${_cmake_parent_process_path} STREQUAL ${CMAKE_MAKE_PROGRAM})
        execute_process(COMMAND bash -c "tr '\\0' ' ' < /proc/$PPID/cmdline"
                        OUTPUT_VARIABLE _cmake_args)

        string(STRIP "${_cmake_args}" _cmake_args)

        set(CMAKE_ARGS "${_cmake_args}"
            CACHE STRING "CMake command line args (set by end user)" FORCE)
    endif()
    message(STATUS "User Specified CMake Arguments: ${CMAKE_ARGS}")
endif()