在XCode上使用定制的OpenCV for iOS生成___sincos_stret未定义的符号 [英] Using custom built OpenCV for iOS on XCode produces ___sincos_stret undefined symbol

问题描述

我想在我的iPhone应用程序使用一个C ++静态库使用修改版本的OpenCV for iOS，我困在这个问题在链接时间：

 架构armv7的未定义符号：
___sincos_stret，引用自：opencv2（imgwarp.o）
 cv :: initInterTab2D（int，bool）
 ld：没有为结构armv7找到符号
 clang：error：linker命令失败，退出代码1（使用-v查看调用）
  pre> 
 
 
我真的不明白我缺少什么，该功能似乎并没有在OpenCV中出现，我在网上找不到任何有意义的东西;我想知道它是否在一些数学库，但我还没有找到任何东西。
 
 
 
我使用Clang编译OpenCV并使用默认的libc ++库。 / p> 
 
 
 libmylibrary.a和OpenCV2框架正确地在链接库列表中。
 
 
 
到XCode，因此我可能错过了一些微不足道的静态库的编译和/或在链接到我的项目。
 
 
 
我没有改变该对象的源代码，因为我的更改与OpenCV的imgproc模块的另一部分相关，因此，我猜想即使使用默认版本也可能发生这种情况。
 
 
 
 Do你有什么线索吗？
解决方案
我遇到这个问题安装XCode 5开发者预览和构建OpenCV与 build_framework.py 脚本。  ___ sincos_stret 似乎是来自使用新的编译器版本。
 
 
 
我通过更改路径到命令行工具。
 
 
 
在终端中，验证XCode命令行路径：
 code> xcode-select --print-path 
  
 c $ c> XCode5-DP.app ，然后切换到Xcode 4的工具：
  xcode-select --switch /Applications/XCode.app/Contents/Developer 
  
重建框架。然后尝试重新编译项目。
 
I'm trying to use a C++ static library into my iPhone app which uses a modified version of OpenCV for iOS and I'm stuck with this issue at linking time:
Undefined symbols for architecture armv7:
  "___sincos_stret", referenced from:
      cv::initInterTab2D(int, bool) in opencv2(imgwarp.o)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I really do not understand what I'm missing, that function does not seem to be present in OpenCV and I do not find anything meaningful on the web; I'm wondering if it's in some mathematical library, but I haven't found anything yet.

I've compiled OpenCV with Clang and using the default libc++ library.

The libmylibrary.a and the OpenCV2 framework are correctly in the list of linked libraries.

I'm new to XCode, therefore I could have missed something trivial in the compilation of the static library and/or in the linking of it into my project.

I haven't changed the source code of that object as my changes were related to another part of the imgproc module of OpenCV, therefore I guess that this could have happen even using the default version.

Do you have any clues?
解决方案
I ran into this problem after installing the XCode 5 developer preview and building OpenCV with the build_framework.py script. ___sincos_stret appears to be coming from using the new compiler version.

I fixed this problem by changing the path to the command-line tools.

In Terminal, verify the XCode command-line path:
xcode-select --print-path
If it prints a path inside XCode5-DP.app, then switch to the tools for Xcode 4:
xcode-select --switch /Applications/XCode.app/Contents/Developer
And rebuild the framework. Then try recompiling the project.

                        
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