1The env_install_toolchain.sh is a shell script to install this toolchain.
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3We can use
4    source ./env_install_toolchain.sh /opt/toolchain
5command line to install toolchain in /opt/toolchain.
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7Or we can use
8    source ./env_install_toolchain.sh dirname
9command line to install toolchain in the "dirname" which you Specified.
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11For now, we can use toolchain in everywhere.
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