Qt

Incompatible Qt versions

When Qt upgrades, sometimes not every package is properly built against the right versions, causing the Cannot mix incompatible Qt library (version 0x50c04) with this library (version 0x50c03) error. This message doesn't however say which library is using the wrong version and it can be hard to figure out.

To remedy this, Alexandr Akulich (Kaffeine) has created a script which finds the incompatible library so it can be rebuild.

>
#!/bin/sh

# This script is useful for investigation of errors like this:
# Cannot mix incompatible Qt library (version 0x50601) with this library (version 0x50800)

# Copyright (C) 2019 Alexandr Akulich
# Feel free to use however you want.

printUsage()
{
    echo "Usage: $0 <Qt version> <path>"
    echo ""
    echo "Examples:"
    echo "    $0 5.11.2 /usr/lib/x86_64-linux-gnu"
    echo "    $0 5.9.6 /opt/Qt/custom/lib/libQt5Core.so"
}

extractVersion()
{
    FULL_VERSION=$1
    
    VERSION_MAJOR=`echo $FULL_VERSION|cut -d '.' -f 1`
    VERSION_MINOR=`echo $FULL_VERSION|cut -d '.' -f 2`
    VERSION_PATCH=`echo $FULL_VERSION|cut -d '.' -f 3`
    VERSION_HEX=`printf "00%02x%02x%02x" $VERSION_MAJOR $VERSION_MINOR $VERSION_PATCH`
    
    echo "$VERSION_HEX"
}

checkFile()
{
    FILE=$1
    SUBJECT=$2
    hexdump -v -e '"%02x"' $FILE |grep $SUBJECT -q
}

QT_VERSION=$1
FILE_OR_DIRECTORY=$2

#echo "Checking path \"$FILE_OR_DIRECTORY\" for Qt version \"$QT_VERSION\""

if [ $# -ne 2 ]; then
    printUsage
    exit 0
fi

QT_VERSION_INT=$(extractVersion $QT_VERSION)

for FILE_ARG in $(find -L "$FILE_OR_DIRECTORY" -type f ); do
    if checkFile $FILE_ARG $QT_VERSION_INT; then
        echo "$FILE_ARG contains a reference to $QT_VERSION"
    fi
done