程序员经验分享-hwhale

Mac gcc 非虚拟 thunk 错误

2024-03-05

我仅在应用程序的部署版本中收到这些非虚拟 thunk 错误。它使用名为 Lgi 的私有框架。使用 XCode 3.1.4（最新的 leopard？）在 10.5.8 上构建，错误如下所示：

Ld /Users/matthew/Code/Scribe-Branches/v2.00/build/Development/Scribe.app/Contents/MacOS/Scribe normal i386
    cd /Users/matthew/Code/Scribe-Branches/v2.00
    /Developer/usr/bin/g++-4.0 -arch i386 -L/Users/matthew/Code/Scribe-Branches/v2.00/build/Development -F/Users/matthew/Code/Scribe-Branches/v2.00/build/Development -F/Users/matthew/Code/Lgi/build -F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development -F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development -F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Deployment -F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development -F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Deployment -filelist /Users/matthew/Code/Scribe-Branches/v2.00/build/Scribe.build/Development/Scribe.build/Objects-normal/i386/Scribe.LinkFileList -framework Carbon -framework Lgi -o /Users/matthew/Code/Scribe-Branches/v2.00/build/Development/Scribe.app/Contents/MacOS/Scribe
Undefined symbols:
  "non-virtual thunk to GWindow::OnDrop(char*, GVariant*, GdcPt2, int)", referenced from:
      vtable for ScribeWndin ScribeApp.o
      vtable for GShutdownin ScribeApp.o
      vtable for CalendarUiin Calendar.o
      vtable for CalendarViewWndin CalendarView.o
      vtable for CalendarConfigin CalendarView.o
      vtable for ScribeExportin Exp_Scribe.o
      vtable for GNewMailDlgin GNewMailDlg.o
      ....etc for lots of classes....

无论如何，我知道我不会留下那些未定义的内容，因为它实际上在开发构建中链接并运行良好。现在，在谷歌搜索问题后，首先要尝试的是更改优化设置，我就是这么做的……而且没有骰子。一些链接错误。

所以这些虚函数最初是在GDragDropTarget中定义的，GWindow的继承如下所示：

class LgiClass GWindow : public GView
#ifndef WIN32
    , public GDragDropTarget
#endif

（LgiClass 用于 win32 上的 __declspec 导出/导入）

关于下一步要尝试什么有什么想法吗？

顺便说一句，这是框架的一些示例标志：

CompileC build/Lgi.build/Deployment/Lgi.build/Objects-normal/i386/GViewCommon.o 
/Users/matthew/Code/Lgi/src/common/Lgi/GViewCommon.cpp normal i386 c++ 
com.apple.compilers.gcc.4_0
cd /Users/matthew/Code/Lgi
/Developer/usr/bin/gcc-4.0 -x c++ -arch i386 -fmessage-length=0 -pipe -Wno-trigraphs 
-fpascal-strings -fasm-blocks -Os -Wreturn-type -Wunused-variable 
-isysroot /Developer/SDKs/MacOSX10.4u.sdk -fvisibility-inlines-hidden 
-mmacosx-version-min=10.4 
-I/Users/matthew/Code/Lgi/build/Lgi.build/Deployment/Lgi.build/Lgi.hmap 
-F/Users/matthew/Code/Lgi/build/Deployment 
-F/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks -Iinclude/common 
-Iinclude/mac -Iinclude/posix -I/Users/matthew/Code/Lgi/build/Deployment/include 
-I/Users/matthew/Code/Lgi/build/Lgi.build/Deployment/Lgi.build/DerivedSources/i386 
-I/Users/matthew/Code/Lgi/build/Lgi.build/Deployment/Lgi.build/DerivedSources 
-DMAC 
-include /var/folders/b4/b4LnxwCQGLCmwy36TH3QuU+++TQ/-Caches-/com.apple.Xcode.503/SharedPrecompiledHeaders/Lgi_Prefix-aukthgaeovjxcucuoascfyqekpzz/Lgi_Prefix.pch -c /Users/matthew/Code/Lgi/src/common/Lgi/GViewCommon.cpp 
-o /Users/matthew/Code/Lgi/build/Lgi.build/Deployment/Lgi.build/Objects-normal/i386/GViewCommon.o

Ld /Users/matthew/Code/Lgi/build/Lgi.build/Deployment/Lgi.build/Objects-normal/i386/Lgi normal i386
cd /Users/matthew/Code/Lgi
setenv MACOSX_DEPLOYMENT_TARGET 10.4
/Developer/usr/bin/g++-4.0 -arch i386 -dynamiclib -isysroot /Developer/SDKs/MacOSX10.4u.sdk 
-L/Users/matthew/Code/Lgi/build/Deployment 
-F/Users/matthew/Code/Lgi/build/Deployment 
-F/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks 
-filelist /Users/matthew/Code/Lgi/build/Lgi.build/Deployment/Lgi.build/Objects-normal/i386/Lgi.LinkFileList 
-install_name @executable_path/../Frameworks/Lgi.framework/Versions/A/Lgi 
-mmacosx-version-min=10.4 -framework Carbon 
-framework SystemConfiguration -Wl,-single_module -compatibility_version 1 
-current_version 1 -o /Users/matthew/Code/Lgi/build/Lgi.build/Deployment/Lgi.build/Objects-normal/i386/Lgi

这是应用程序的编译/链接标志：

    CompileC build/Scribe.build/Deployment/Scribe.build/Objects-normal/ppc/IHttp.o 
/Users/matthew/Code/Lgi/src/common/INet/IHttp.cpp normal ppc c++ com.apple.compilers.gcc.4_0
cd /Users/matthew/Code/Scribe-Branches/v2.00
/Developer/usr/bin/gcc-4.0 -x c++ -arch ppc -fmessage-length=0 -pipe -Wno-trigraphs 
-fpascal-strings -Os -mdynamic-no-pic -DMAC -DSCRIBE_APP -isysroot /Developer/SDKs/MacOSX10.4u.sdk 
-mtune=G4 -fvisibility=hidden -fvisibility-inlines-hidden -mmacosx-version-min=10.4 
-I/Users/matthew/Code/Scribe-Branches/v2.00/build/Scribe.build/Deployment/Scribe.build/Scribe.hmap 
-F/Users/matthew/Code/Scribe-Branches/v2.00/build/Deployment -F/Users/matthew/Code/Lgi/build 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Deployment 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Deployment 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Deployment 
-I/Users/matthew/libpng-1.2.37 -I/Users/matthew/jpeg-6b -I../../Lgi/include/common 
-I../../Lgi/include/mac -I../../aspell-0.60.6/interfaces/cc 
-I/Users/matthew/Code/Scribe-Branches/v2.00/build/Deployment/include 
-IResources -I../Lgi/include/common -I../Lgi/include/mac 
-I/Users/matthew/Code/Scribe-Branches/v2.00/build/Scribe.build/Deployment/Scribe.build/DerivedSources/ppc 
-I/Users/matthew/Code/Scribe-Branches/v2.00/build/Scribe.build/Deployment/Scribe.build/DerivedSources 
-DMAC 
-include /var/folders/b4/b4LnxwCQGLCmwy36TH3QuU+++TQ/-Caches-/com.apple.Xcode.503/SharedPrecompiledHeaders/Scribe_Prefix-ebutivbeomfbzzguhklrzxnwuwzc/Scribe_Prefix.pch 
-c /Users/matthew/Code/Lgi/src/common/INet/IHttp.cpp 
-o /Users/matthew/Code/Scribe-Branches/v2.00/build/Scribe.build/Deployment/Scribe.build/Objects-normal/ppc/IHttp.o

Ld /Users/matthew/Code/Scribe-Branches/v2.00/build/Scribe.build/Deployment/Scribe.build/Objects-normal/i386/Scribe 
normal i386
cd /Users/matthew/Code/Scribe-Branches/v2.00
setenv MACOSX_DEPLOYMENT_TARGET 10.4
/Developer/usr/bin/g++-4.0 -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk 
-L/Users/matthew/Code/Scribe-Branches/v2.00/build/Deployment 
-F/Users/matthew/Code/Scribe-Branches/v2.00/build/Deployment 
-F/Users/matthew/Code/Lgi/build 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Deployment 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Deployment 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Development 
-F/Users/matthew/Code/Scribe-Branches/v2.00/../../Lgi/build/Deployment 
-filelist /Users/matthew/Code/Scribe-Branches/v2.00/build/Scribe.build/Deployment/Scribe.build/Objects-normal/i386/Scribe.LinkFileList 
-mmacosx-version-min=10.4 -framework Carbon -framework Lgi 
-o /Users/matthew/Code/Scribe-Branches/v2.00/build/Scribe.build/Deployment/Scribe.build/Objects-normal/i386/Scribe

Undefined symbols:
"non-virtual thunk to GWindow::OnDrop(char*, GVariant*, GdcPt2, int)", referenced from:
    vtable for ScribeWndin ScribeApp.o
    vtable for GShutdownin ScribeApp.o

我不确定什么是相关的，所以我把它们全部发布了。


找到了 Matt 的帖子，大概是 Apple 的某个人：http://lists.apple.com/archives/unix-porting/2003/Dec/msg00107.html http://lists.apple.com/archives/unix-porting/2003/Dec/msg00107.html

马特在其中说道：

[非虚拟 thunk 是]一个内部 用于 C++ 的实现细节 涉及的类层次结构 多重继承。你没有做 哪里不对了;这是一个编译器 漏洞。我们知道我们需要修复它。 与此同时，最好的解决办法 我们知道的是使用相同的 链接的优化级别 您用来编译的库 图书馆。

（您也可以考虑不导出 来自库的 C++ 接口。我们 非常努力地工作以确保 C 和 Objective C ABI 保持不变 从一个编译器版本到下一个编译器版本， 但我们对 C++ 没有做出这样的承诺。）

      --Matt

那么也许您正在尝试使用由不同版本的 C++ 编译器编译的 C++ 库？ C++ ABI 似乎并未被定义为可移植的。

Reid

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