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roywei/change ubuntu default gcc

Created August 23, 2020 06:37
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change ubuntu default gcc
sudo apt-get update && \
sudo apt-get install -y software-properties-common && \
sudo add-apt-repository ppa:ubuntu-toolchain-r/test && \
sudo apt-get update && \
sudo apt-get install -y gcc-7 g++-7 && \
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-7 60 && \
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 60
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