Bash script for switching the current gcc compiler.

switchgcc.sh

if [[ -z "$1" ]]; then
    exit 1
fi

if [[ -e $1/bin/avr-gcc-7.1.0 ]]; then
    cppopt=gnu++1z
elif [[ -e $1/bin/avr-gcc-4.9.2 ]]; then
    cppopt=gnu++11
else
    echo unknown compiler version
    exit 1
fi

HWDIR=~/Applications/Arduino.app/Contents/Java/hardware
# assuming tools/avr is already a symlink 
rm $HWDIR/tools/avr
ln -s "$1" $HWDIR/tools/avr
perl -i.bak -ple "s/gnu\+\+1\w/$cppopt/" $HWDIR/arduino/avr/platform.txt