Your C++ compiler does NOT fully support C++17,升级gcc到支持c++17

快速升级gcc的方法,无需下载源码编译。

sudo apt-get install g++-8
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 700 --slave /usr/bin/g++ g++ /usr/bin/g++-7
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 800 --slave /usr/bin/g++ g++ /usr/bin/g++-8

 

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