Code appears to compile correctly with the Arduino CLI compiler but not with the arduino_ci compiler. See https://gcc.gnu.org/onlinedocs/gcc-4.7.2/gcc/Function-Attributes.html.
Changing cpp_library.rb:497 from -std=c++0x to -std=c++11 solves this problem. See Arduino-CI/arduino_ci#146.
Furthermore, this is only a warning and if there are no errors then it is silently ignored so we can proceed.
Code appears to compile correctly with the Arduino CLI compiler but not with the
arduino_cicompiler. See https://gcc.gnu.org/onlinedocs/gcc-4.7.2/gcc/Function-Attributes.html.Changing
cpp_library.rb:497from-std=c++0xto-std=c++11solves this problem. See Arduino-CI/arduino_ci#146.Furthermore, this is only a warning and if there are no errors then it is silently ignored so we can proceed.