各平台宏

#include <QCoreApplication>
#include <QtDebug>
int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    int a = 0;
#ifdef _WIN32
    a = 100;
#elif __linux__
    a = 200;
#ifdef __arm__
    a = 300;
#endif    //__arm__

#endif

    qDebug() << a;
    
    return app.exec();
}