libtorrent-rasterbar和QGuiApplication导致内存损坏

问题描述

我正在尝试在我的Qt5应用程序中使用libtorrent，但始终会出现段错误带有malloc()之类的消息:内存损坏.经过数小时的调试后，我想到了触发这一问题的一小段代码:

I'm trying to use libtorrent in my Qt5 application but keep getting segfaultswith messages like malloc(): memory corruption. After hours of debbuging I come up with this small piece of code which triggers this problem:

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    std::string filename = "fedora.torrent";
    libtorrent::error_code ec;
    libtorrent::add_torrent_params parameters;
    std::cerr << "111\n";
    parameters.ti = new libtorrent::torrent_info(filename, ec);;
    std::cerr << "222\n";
    return app.exec()
}

在这种情况下，torrent_info的构造函数会产生segfault.但是，如果我在创建QGuiApplication之前像这样移动与libtorrent相关的代码:

In this case constructor of torrent_info produce segfault. But if I move libtorrent related code before creation of QGuiApplication like this:

int main(int argc, char *argv[])
{
    std::string filename = "fedora.torrent";
    libtorrent::error_code ec;
    libtorrent::add_torrent_params parameters;
    std::cerr << "111\n";
    parameters.ti = new libtorrent::torrent_info(filename, ec);;
    std::cerr << "222\n";
    QGuiApplication app(argc, argv);
    return app.exec()
}

然后就可以了.同样，此问题仅在32位版本中存在，在64位版本中，两个变体的工作方式相同.

then it works just fine. Also this problem exist only in 32-bit build, in 64-bit build both variants work the same.

推荐答案

这很可能是由于使用一组TORRENT_ *定义构建libtorrent并使用另一组TORRENT_ *对其进行链接而引起的.其中一些定义影响公共API中使用的某些结构的布局，并且当调用应用程序与库之间存在差异时，会引入ABI不兼容问题.

This is most likely caused by building libtorrent with one set of TORRENT_* defines and linking against it with a different set. Some of those defines affect layouts of some structs used in the public API and when differing between the calling application and the library introduce ABI incompatibility issues.

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