[BUG#2024] fixed crypto/Qt version issues for ubuntu 20.04 compile.

[ElonKou]

As #2024 , we fixd the BUG of compiling of ubuntu 20.04.

• add a crypto library insatll command for ubuntu 20.04.
• support ubuntu 20.04's default crypto version for compiling.
• fixed the problem which ubuntu 20.04's default Qt 5.12 version has no splitCommand function.

Related issue number (if any) = #2024

[legobadman]

this is the implement of splitCommand, you can copy that.

QStringList QProcess::splitCommand(QStringView command)
{
QStringList args;
QString tmp;
int quoteCount = 0;
bool inQuote = false;

// handle quoting. tokens can be surrounded by double quotes
// "hello world". three consecutive double quotes represent
// the quote character itself.
for (int i = 0; i < command.size(); ++i) {
    if (command.at(i) == QLatin1Char('"')) {
        ++quoteCount;
        if (quoteCount == 3) {
            // third consecutive quote
            quoteCount = 0;
            tmp += command.at(i);
        }
        continue;
    }
    if (quoteCount) {
        if (quoteCount == 1)
            inQuote = !inQuote;
        quoteCount = 0;
    }
    if (!inQuote && command.at(i).isSpace()) {
        if (!tmp.isEmpty()) {
            args += tmp;
            tmp.clear();
        }
    } else {
        tmp += command.at(i);
    }
}
if (!tmp.isEmpty())
    args += tmp;

return args;

}

[ElonKou]

@legobadman Thanks for your reply, I solved the problem using auto cmdArgs = cmd.split(QRegularExpression("\s+"), QString::SkipEmptyParts);. If the splitCommand function is added and merged into the main branch, it may cause conflicts for users using Qt6.

[legobadman]

@legobadman Thanks for your reply, I solved the problem using auto cmdArgs = cmd.split(QRegularExpression("\s+"), QString::SkipEmptyParts);. If the splitCommand function is added and merged into the main branch, it may cause conflicts for users using Qt6.

but we need to consider the case which the command has quote, not only space. you can copy the code of QProcess::splitCommand.

by the way, we recommand choose Qt5.15 or 5.14, it's not easy to switch different version of qt.

[ElonKou]

@legobadman OK, I just copy the QProcess::splitCommand function in my local code, thank you.