loop variable 'featuresFilename' creates a copy from type 'const std::string' (aka 'const basic_string<char, char_traits<char>, allocator<char>>') [-Wrange-loop-construct]

'tmpnam' is deprecated: This function is provided for compatibility reasons only. Due to security concerns inherent in the design of tmpnam(3), it is highly recommended that you use mkstemp(3) instead. [-Wdeprecated-declarations]