使用 OGRE 库为模拟器编译 iPhone 应用程序时出现链接器错误

Question

我正在尝试使用 OGRE 框架构建 iPhone 应用程序，但在构建模拟器时遇到链接器错误，我不确定如何修复。

我使用 OGRE iPhone 模板创建了 Xcode 项目。我正在使用主网站 Ogre_iOS_4.0_Dependency_20100623 中的 OGRE 静态库，并尝试为 iOS 4.1 模拟器进行构建。我正在 Mac OS X 10.6.4 上使用 Xcode 3.2.4 进行构建。

编译似乎工作正常，但是当进入链接阶段时，我收到以下错误：

Ld build/Debug-iphonesimulator/OgreTestApp.app/OgreTestApp normal i386
cd /Users/pauly/Projects/workspaces/games/OgreTestApp
setenv MACOSX_DEPLOYMENT_TARGET 10.6
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/g++-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.1.sdk -L/Users/pauly/Projects/workspaces/games/OgreTestApp/build/Debug-iphonesimulator -L/Users/pauly/Projects/sdk/Ogre/OgreSDK-iPhone/lib/release -L/Users/pauly/Projects/sdk/Ogre/OgreSDK-iPhone/iPhoneDependencies/lib/release -F/Users/pauly/Projects/workspaces/games/OgreTestApp/build/Debug-iphonesimulator -filelist /Users/pauly/Projects/workspaces/games/OgreTestApp/build/OgreTestApp.build/Debug-iphonesimulator/OgreTestApp.build/Objects-normal/i386/OgreTestApp.LinkFileList -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -framework Foundation -framework UIKit -framework OpenGLES -framework QuartzCore -lboost_date_time -lboost_thread -lFreeImage -lFreeType -lOIS -lzzip -lOgreMainStatic -lRenderSystem_GLESStatic -lPlugin_BSPSceneManagerStatic -lPlugin_OctreeSceneManagerStatic -lPlugin_ParticleFXStatic -o /Users/pauly/Projects/workspaces/games/OgreTestApp/build/Debug-iphonesimulator/OgreTestApp.app/OgreTestApp

ld: warning: __gnu_cxx::new_allocator<std::_Rb_tree_node<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::allocate(unsigned long, void const*)has different visibility (default) in /Users/pauly/Projects/sdk/Ogre/OgreSDK-iPhone/lib/release/libOIS.a(OISInputManager.o) and (hidden) in /Users/pauly/Projects/workspaces/games/OgreTestApp/build/OgreTestApp.build/Debug-iphonesimulator/OgreTestApp.build/Objects-normal/i386/OgreFramework.o
ld: warning: std::_Rb_tree<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::_Select1st<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::_M_create_node(std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > const&)has different visibility (default) in /Users/pauly/Projects/sdk/Ogre/OgreSDK-iPhone/lib/release/libOIS.a(OISInputManager.o) and (hidden) in /Users/pauly/Projects/workspaces/games/OgreTestApp/build/OgreTestApp.build/Debug-iphonesimulator/OgreTestApp.build/Objects-normal/i386/OgreFramework.o
ld: warning: std::char_traits<char>::eq(char const&, char const&)has different visibility (hidden) in /Users/pauly/Projects/sdk/Ogre/OgreSDK-iPhone/lib/release/libFreeImage.a(IPTC.o) and (default) in /Users/pauly/Projects/sdk/Ogre/OgreSDK-iPhone/lib/release/libOgreMainStatic.a(OgreString.o)
ld: warning: std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >::_M_insert_aux(__gnu_cxx::__normal_iterator<std::basic_string<char, std::char_traits<char>, std::allocator<char> >*, std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)has different visibility (hidden) in /Users/pauly/Projects/sdk/Ogre/OgreSDK-iPhone/lib/release/libFreeImage.a(IPTC.o) and (default) in /Users/pauly/Projects/sdk/Ogre/OgreSDK-iPhone/lib/release/libOgreMainStatic.a(OgreScriptCompiler.o)
Undefined symbols:
  ".objc_class_name_NSAutoreleasePool", referenced from:
      literal-pointer@__OBJC@__cls_refs@NSAutoreleasePool in libRenderSystem_GLESStatic.a(OgreEAGLWindow.o)
  ".objc_class_name_UIApplication", referenced from:
      literal-pointer@__OBJC@__cls_refs@UIApplication in libOIS.a(iPhoneInputManager.o)
  ".objc_class_name_UIWindow", referenced from:
      literal-pointer@__OBJC@__cls_refs@UIWindow in libRenderSystem_GLESStatic.a(OgreEAGLWindow.o)
  ".objc_class_name_UIView", referenced from:
      .objc_class_name_InputDelegate in libOIS.a(iPhoneInputManager.o)
      .objc_class_name_EAGLView in libRenderSystem_GLESStatic.a(OgreEAGLWindow.o)
  ".objc_class_name_UIAccelerometer", referenced from:
      literal-pointer@__OBJC@__cls_refs@UIAccelerometer in libOIS.a(iPhoneInputManager.o)
      literal-pointer@__OBJC@__cls_refs@UIAccelerometer in libOIS.a(iPhoneAccelerometer.o)
  ".objc_class_name_CAEAGLLayer", referenced from:
      literal-pointer@__OBJC@__cls_refs@CAEAGLLayer in libRenderSystem_GLESStatic.a(OgreEAGLWindow.o)
  ".objc_class_name_EAGLContext", referenced from:
      literal-pointer@__OBJC@__cls_refs@EAGLContext in libRenderSystem_GLESStatic.a(OgreEAGLESContext.o)
  ".objc_class_name_NSDictionary", referenced from:
      literal-pointer@__OBJC@__cls_refs@NSDictionary in libRenderSystem_GLESStatic.a(OgreEAGLWindow.o)
  ".objc_class_name_NSNumber", referenced from:
      literal-pointer@__OBJC@__cls_refs@NSNumber in libRenderSystem_GLESStatic.a(OgreEAGLWindow.o)
  ".objc_class_name_UIScreen", referenced from:
      literal-pointer@__OBJC@__cls_refs@UIScreen in libOIS.a(iPhoneInputManager.o)
      literal-pointer@__OBJC@__cls_refs@UIScreen in libRenderSystem_GLESStatic.a(OgreEAGLSupport.o)
      literal-pointer@__OBJC@__cls_refs@UIScreen in libRenderSystem_GLESStatic.a(OgreEAGLWindow.o)
ld: symbol(s) not found
collect2: ld returned 1 exit status

如何解决此问题？谢谢。

Answer 1

可能您需要正确的预编译 Ogre 依赖项才能获得正确的 iOS SDK 版本（Masterfalcon 定期在 ogre3d.org 上发布这些依赖项）。
类似的链接器错误通常是由不正确的 iPhoneDependency 引起的（为您拥有的旧 iPhoneSKD 构建）。

只需按照此处列出的说明进行操作即可：
http://www.ogre3d.org/tikiwiki/Building+Ogre+with+CMake
“为 iPhone 配置”部分。
一切都应该建立得很好。