libc/config/linux/config.json

{
  "scanf": {
    "LIBC_CONF_SCANF_PROVIDE_ISOC99_ALIASES": {
      "value": "${LLVM_LIBC_OVERLAY}"
    }
  },
  "string": {
    "LIBC_CONF_STRING_LENGTH_IMPL": {
      "value": "clang_vector"
    },
    "LIBC_CONF_FIND_FIRST_CHARACTER_IMPL": {
      "value": "word"
    }
  }
}