On 2017-04-29 00:45 -0400, Jeffrey Walton wrote: > Thanks. Is that -std=c++14 or -std=gnu++14? See the man page of GCC 7: > gnu++14 > gnu++1y > GNU dialect of -std=c++14. This is the default for C++ code. > The name gnu++1y is deprecated. -- Xi Ruoyao <ryxi@xxxxxxxxxxxxxxxxx> School of Aerospace Science and Technology, Xidian University