在 Xcode 中创建一个 Objective-C++ 静态库

Creating an Objective-C++ Static Library in Xcode

提问by LandonSchropp

So I've developed an engine for the iPhone with which I'd like to build a couple different games. Rather than copy and paste the files for the engine inside of each game's project directory, I'd a way to link to the engine from each game, so if I need to make a change to it I only have to do so once. After reeding around a little bit, it seems like static libraries are the best way to do this on the iPhone.

所以我为 iPhone 开发了一个引擎，我想用它来构建几个不同的游戏。我没有将引擎的文件复制并粘贴到每个游戏的项目目录中，而是一种从每个游戏链接到引擎的方法，因此如果我需要对其进行更改，我只需要这样做一次。在稍微摸索之后，似乎静态库是在 iPhone 上执行此操作的最佳方式。

I created a new project called Skeleton and copied all of my engine files over to it. I used thisguide to create a static library, and I imported the library into a project called Chooser. However, when I tried to compile the project, Xcode started complaining about some C++ data structures I included in a file called ControlScene.mm. Here's my build errors:

我创建了一个名为 Skeleton 的新项目，并将我所有的引擎文件复制到其中。我使用本指南创建了一个静态库，并将该库导入到一个名为 Chooser 的项目中。然而，当我尝试编译项目时，Xcode 开始抱怨我包含在一个名为 ControlScene.mm 的文件中的一些 C++ 数据结构。这是我的构建错误：

  "operator delete(void*)", referenced from:


      -[ControlScene dealloc] in libSkeleton.a(ControlScene.o)


      -[ControlScene init] in libSkeleton.a(ControlScene.o)


      __gnu_cxx::new_allocator<operation_t>::deallocate(operation_t*, unsigned long)in libSkeleton.a(ControlScene.o)


      __gnu_cxx::new_allocator<operation_t*>::deallocate(operation_t**, unsigned long)in libSkeleton.a(ControlScene.o)


  "operator new(unsigned long)", referenced from:


      -[ControlScene init] in libSkeleton.a(ControlScene.o)


      __gnu_cxx::new_allocator<operation_t*>::allocate(unsigned long, void const*)in libSkeleton.a(ControlScene.o)


      __gnu_cxx::new_allocator<operation_t>::allocate(unsigned long, void const*)in libSkeleton.a(ControlScene.o)


  "std::__throw_bad_alloc()", referenced from:


      __gnu_cxx::new_allocator<operation_t*>::allocate(unsigned long, void const*)in libSkeleton.a(ControlScene.o)


      __gnu_cxx::new_allocator<operation_t>::allocate(unsigned long, void const*)in libSkeleton.a(ControlScene.o)


  "___cxa_rethrow", referenced from:


      std::_Deque_base<operation_t, std::allocator<operation_t> >::_M_create_nodes(operation_t**, operation_t**)in libSkeleton.a(ControlScene.o)


      std::_Deque_base<operation_t, std::allocator<operation_t> >::_M_initialize_map(unsigned long)in libSkeleton.a(ControlScene.o)


  "___cxa_end_catch", referenced from:


      std::_Deque_base<operation_t, std::allocator<operation_t> >::_M_create_nodes(operation_t**, operation_t**)in libSkeleton.a(ControlScene.o)


      std::_Deque_base<operation_t, std::allocator<operation_t> >::_M_initialize_map(unsigned long)in libSkeleton.a(ControlScene.o)


  "___gxx_personality_v0", referenced from:


      ___gxx_personality_v0$non_lazy_ptr in libSkeleton.a(ControlScene.o)


      ___gxx_personality_v0$non_lazy_ptr in libSkeleton.a(MenuLayer.o)


  "___cxa_begin_catch", referenced from:


      std::_Deque_base<operation_t, std::allocator<operation_t> >::_M_create_nodes(operation_t**, operation_t**)in libSkeleton.a(ControlScene.o)


      std::_Deque_base<operation_t, std::allocator<operation_t> >::_M_initialize_map(unsigned long)in libSkeleton.a(ControlScene.o)


ld: symbol(s) not found


collect2: ld returned 1 exit status

If anybody could offer some insight as to why these problems are occuring, I'd appreciate it.

如果有人能就为什么会出现这些问题提供一些见解，我将不胜感激。

回答by dale

Set the "-lstdc++" to Other Linker Flags

将“-lstdc++”设置为其他链接器标志

回答by Michael Aaron Safyan

The problem is that your library is dynamically linking against libstdc++. As to how to fix it, you should try "-static", "-static-libstdc++", and "-static-libgcc" in various combinations when building your library (not sure which of them are needed, but some combination thereof should make it fully static).

问题是您的库正在动态链接 libstdc++。至于如何修复它，您应该在构建库时尝试各种组合中的“-static”、“-static-libstdc++”和“-static-libgcc”（不确定需要哪一个，但应该有一些组合）使其完全静态）。

Edit
Well, it turns out that you are permitted to dynamically link against libstdc++ on the iPhone, so actually a better solution is to simply put "-lstdc++" in (that is, explicitly link against libstdc++) in your build.

编辑
好吧，事实证明你可以在 iPhone 上动态链接 libstdc++，所以实际上更好的解决方案是简单地将“-lstdc++”放入你的构建中（即明确链接 libstdc++）。

回答by LandonSchropp

I fixed the problem by going into the build settings for Chooser, searching out "Compile Source As" and selecting Objective-C++. This is probably a dirty solution, but it worked.

我通过进入选择器的构建设置，搜索“编译源为”并选择 Objective-C++ 解决了这个问题。这可能是一个肮脏的解决方案，但它奏效了。

回答by Ege Akpinar

I ran into this issue when trying to link a .framework. I've managed to fix it by adding an emptycppstub.mmfile as source (to Compile Sourcesphase)

我在尝试链接 .framework 时遇到了这个问题。我设法通过添加一个空cppstub.mm文件作为源（Compile Sources阶段）来修复它

I guess it must be forcing some sort of C++ compilation when you do this, don't ask me why

我猜你这样做时一定是在强制进行某种 C++ 编译，别问我为什么