鏈接C ++動態庫時，延遲符號綁定失敗

Question

我正在用C ++編寫一個dylib，但是當我嘗試將它鏈接到我的應用程序時，它會給我一個執行錯誤：

dyld: lazy symbol binding failed: Symbol not found: __ZN8Vector2DC1Ev
  Referenced from: /Users/noahz/Desktop/Singularity/Singularity Test App/build/Debug/Singularity Test App
  Expected in: /Users/noahz/Desktop/Singularity/Singularity Test App/build/Debug/libSingularity.dylib

dyld: Symbol not found: __ZN8Vector2DC1Ev
  Referenced from: /Users/noahz/Desktop/Singularity/Singularity Test App/build/Debug/Singularity Test App
  Expected in: /Users/noahz/Desktop/Singularity/Singularity Test App/build/Debug/libSingularity.dylib

我確保符號沒有剝離，並且

nm -g libSingularity.dylib  | grep "T" | grep __ZN8Vector

報告該符號存在於庫中：

0000000000006df6 T __ZN8Vector2DC1Eff
0000000000006d98 T __ZN8Vector2DC1Ev
0000000000006dc2 T __ZN8Vector2DC2Eff
0000000000006d6e T __ZN8Vector2DC2Ev

我從XCode內部鏈接，所以鏈接命令有點奇怪。 這是dylib的鏈接器命令：

Ld "/Users/noahz/Desktop/Singularity/Singularity Engine/build/Debug
    /libSingularity.dylib" normal x86_64
cd "/Users/noahz/Desktop/Singularity/Singularity Engine"
setenv MACOSX_DEPLOYMENT_TARGET 10.6
/Developer/usr/bin/g++-4.2 -arch x86_64 -dynamiclib -isysroot /Develope
    /SDKs/MacOSX10.6.sdk "-L/Users/noahz/Desktop/Singularity/Singularity Engine/build
    /Debug" "-F/Users/noahz/Desktop/Singularity/Singularity Engine/build/Debug"
    -filelist "/Users/noahz/Desktop/Singularity/Singularity Engine/build/Singularity 
    Engine.build/Debug/Singularity Engine.build/Objects-normal/x86_64
    /libSingularity.LinkFileList" -install_name libSingularity.dylib -mmacosx-version-
    min=10.6 -framework sfml-system-d -framework sfml-window-d -framework SFML 
    -framework OpenGL -framework OpenAL -framework sfml-graphics-d -single_module 
    -compatibility_version 1 -current_version 1 -o "/Users/noahz/Desktop/Singularity
    /Singularity Engine/build/Debug/libSingularity.dylib"

這是測試應用程序的鏈接器命令：

cd "/Users/noahz/Desktop/Singularity/Singularity Test App"
setenv MACOSX_DEPLOYMENT_TARGET 10.6
/Developer/usr/bin/g++-4.2 -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.6.sdk 
    "-L/Users/noahz/Desktop/Singularity/Singularity Test App/build/Debug" "-F/Users
    /noahz/Desktop/Singularity/Singularity Test App/build/Debug" -filelist "/Users/noahz
    /Desktop/Singularity/Singularity Test App/build/Singularity Test App.build/Debug
    /Singularity Test App.build/Objects-normal/x86_64/Singularity Test 
    App.LinkFileList" -mmacosx-version-min=10.6 "/Users/noahz/Desktop/Singularity
    /Singularity Engine/build/Debug/libSingularity.dylib" -o "/Users/noahz/Desktop
    /Singularity/Singularity Test App/build/Debug/Singularity Test App"

關於為什么會發生這種情況和/或如何修復它的任何想法？

Answer 1

如果您的應用程序在架構x86 / 64上與您嘗試加載的庫不同，那么這可能會解釋您遇到的問題。

兩者都必須使用相同的架構進行編譯。

Answer 2

我沒有在鏈接階段看到一行

-lSingularity

顯然，加載動態庫的另一種方法是明確地從代碼中加載它。

gSystem->Load("libSingularity");

我只是在解釋我發現的博客文章。

http://root.cern.ch/phpBB3//viewtopic.php?f=3&t=10380&start=0

Answer 3

我通過靜態鏈接庫來解決問題。 它並不像動態鏈接那么優雅，但至少它不會反復崩潰。