Question

在使用Xcode 6为iOS构建Poco C ++应用程序时，有没有其他人看到这些链接器警告？

ld: warning: direct access in std::__1::vector<Poco::Dynamic::Var, std::__1::allocator<Poco::Dynamic::Var> > const& Poco::Dynamic::Var::extract<std::__1::vector<Poco::Dynamic::Var, std::__1::allocator<Poco::Dynamic::Var> > >() const to global weak symbol typeinfo for std::__1::vector<Poco::Dynamic::Var, std::__1::allocator<Poco::Dynamic::Var> > means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings.
ld: warning: direct access in std::__1::vector<Poco::Dynamic::Var, std::__1::allocator<Poco::Dynamic::Var> > const& Poco::Dynamic::Var::extract<std::__1::vector<Poco::Dynamic::Var, std::__1::allocator<Poco::Dynamic::Var> > >() const to global weak symbol typeinfo for std::__1::vector<Poco::Dynamic::Var, std::__1::allocator<Poco::Dynamic::Var> > means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings.
ld: warning: direct access in std::__1::vector<Poco::Dynamic::Var, std::__1::allocator<Poco::Dynamic::Var> > const& Poco::Dynamic::Var::extract<std::__1::vector<Poco::Dynamic::Var, std::__1::allocator<Poco::Dynamic::Var> > >() const to global weak symbol typeinfo for std::__1::vector<Poco::Dynamic::Var, std::__1::allocator<Poco::Dynamic::Var> > means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings.
ld: warning: direct access in std::__1::vector<Poco::Dynamic::Var, std::__1::allocator<Poco::Dynamic::Var> > const& Poco::Dynamic::Var::extract<std::__1::vector<Poco::Dynamic::Var, std::__1::allocator<Poco::Dynamic::Var> > >() const to global weak symbol typeinfo for std::__1::vector<Poco::Dynamic::Var, std::__1::allocator<Poco::Dynamic::Var> > means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings.

如果是这样，你确定了导致他们的原因以及解决方法吗？

编辑：根据此主题的其他主题，我已经验证了＆＃34;默认隐藏的符号＆＃34;所有项目都设置为YES，包括Poco。

感谢。

Answer 1

在我的带有多个静态库的iOS项目中，有很多这些警告 - 都是关于对全局弱符号typeinfo的引用。

终于找到了解决方案：

不要将“默认情况下隐藏的符号”设置为YES。将其设置为默认值 - 在“构建设置”中选择相关行，点击删除。对于我的主要iOS可执行文件，似乎解析为“是”，对于静态库，似乎为“否”。

执行此操作后，所有关于直接访问全局弱符号的警告都消失了，我的整个项目似乎都能正常工作。

我希望这有用。

奇怪的Xcode链接器警告构建Poco C ++应用程序

1 个答案: