kconfig.cmake

# Original Source: https://github.com/zephyrproject-rtos/zephyr (Apache 2.0)
# 2.2 Misc
#
# Parse a KConfig formatted file (typically named *.config) and
# introduce all the CONF_ variables into the CMake namespace
function(import_kconfig config_file)
  # Parse the lines prefixed with CONFIG_ in ${config_file}
  file(
    STRINGS
    ${config_file}
    DOT_CONFIG_LIST
    REGEX "^CONFIG_"
    ENCODING "UTF-8"
    )

  foreach (CONFIG ${DOT_CONFIG_LIST})
    # CONFIG looks like: CONFIG_NET_BUF=y

    # Match the first part, the variable name
    string(REGEX MATCH "[^=]+" CONF_VARIABLE_NAME ${CONFIG})

    # Match the second part, variable value
    string(REGEX MATCH "=(.+$)" CONF_VARIABLE_VALUE ${CONFIG})
    # The variable name match we just did included the '=' symbol. To just get the
    # part on the RHS we use match group 1
    set(CONF_VARIABLE_VALUE ${CMAKE_MATCH_1})

    if("${CONF_VARIABLE_VALUE}" MATCHES "^\"(.*)\"$") # Is surrounded by quotes
      set(CONF_VARIABLE_VALUE ${CMAKE_MATCH_1})
    endif()

    set("${CONF_VARIABLE_NAME}" "${CONF_VARIABLE_VALUE}" PARENT_SCOPE)
  endforeach()
endfunction()