Bug#841533: You could revert to gcc-5

[Ron Murray]

You can use this to revert to gcc-5, which still works.

Use it as:

# gcc-select <old version> <new version>

e.g.
# gcc-select 6 5

   ... will revert to gcc 5 to allow you to compile a kernel.

# gcc-select 5 6

   ... will revert to gcc-6.

   Obviously, you need to be root for this. And while it works fine for
gcc-5 and gcc-6, I have no idea whether it'll work for previous or
future gcc versions. It depends on whether gcc, cc and other executables
are symlinked to gcc-5, cc-6 and so on.

Hope it helps.

 .....Ron
 

-- 
Ron Murray <r...@rjmx.net>
PGP Fingerprint: 4D99 70E3 2317 334B 141E  7B63 12F7 E865 B5E2 E761


#! /bin/bash

# Select gcc version
# Assumes "gcc" etc in linked to "gcc-5" etc


BINDIR="/usr/bin"

# Array contining links to be changed
declare LINKS=("cpp" "g++" "gcc" "gcc-ar" "gcc-nm" "gcc-ranlib" \
                                         "gcov" "gcov-tool" "gfortran")

# Make sure it's specified
OLDVER=$1
NEWVER=$2

if [ -z "${OLDVER}" ] || [ -z "${NEWVER}" ]
then
        echo "Usage: gcc-select [oldver] [newver]"
        echo "Currently:"
        ls -l ${BINDIR}/${LINKS[0]}
        exit
fi

for LINK in ${LINKS[*]}
do
        echo ${LINK}

        # Check that old and new destinations exist
        TARGET=${BINDIR}/${LINK}
        OLDPOINT=${TARGET}-${OLDVER}
        NEWPOINT=${TARGET}-${NEWVER}

        if [ ! -e ${OLDPOINT} ]
        then
                echo "Current destination ${OLDPOINT} doesn't exist."
                exit
        fi
        
        if [ ! -e ${NEWPOINT} ]
        then
                echo "Intended destination ${NEWPOINT} doesn't exist."
                exit
        fi

        if ! rm -f ${TARGET}
        then
                echo "Error removing link ${TARGET}."
                exit
        fi
        
        if ! ln -sf ${NEWPOINT} ${TARGET}
        then
                echo "Error creating symbolic link ${NEWPOINT} --> ${TARGET}"
                exit
        fi
        
done

echo "Done."

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