部署目标为7.0时，体系结构错误的未定义符号 [英] Undefined symbols for architecture error when deployment target is 7.0

问题描述

我在我的原生iOS应用程序（一堆.a库）中使用第三方框架。我的应用程序是使用XCode 5基础SDK 7.0开发的。

I am using third party frameworks in my native iOS application (bunch of .a libraries). My application is developed with XCode 5 base SDK 7.0.

当部署目标为6.1（库和标题搜索路径良好）时，库可以编译和链接。但是，当我将部署目标更改为7.0时，我收到以下链接器错误：

The libraries compile and link fine when the deployment target is 6.1 (library and header search paths are good). However, when I change the deployment target to be 7.0, I get the following linker error:

Undefined symbols for architecture i386:
  "std::string::find_last_of(char const*, unsigned long) const", referenced from:
      GetExecutionDir(ECTemplateString<char>&, char*, bool) in myLibrary.a(moPlatForm.o)
  "std::string::find(char const*, unsigned long) const", referenced from:
      ParseLog(std::string const&, unsigned int&, CmoDateTime&, int&, std::string&) in myLibrary.a(AppLog.o)
  "std::string::size() const", referenced from:
      mo::CmoParam::WriteToStream(void*, mo::STREAM_STATE*) in myLibrary.a(moParams.o)
  "std::string::c_str() const", referenced from:
      GetExecutionDir(ECTemplateString<char>&, char*, bool) in myLibrary.a(moPlatForm.o)
      CMocaFileTransfer::UpdateParamsForGetTraceFiles(mo::CmoParamList&, long) in myLibrary.a(RobieFileTransfer.o)
      CMocaFileTransfer::AddTraceFileForUpload(std::string const&, std::string const&) in myLibrary.a(RobieFileTransfer.o)
      CMocaFileTransfer::CreateParamsForSendTraceFiles(mo::CmoObject&) in myLibrary.a(RobieFileTransfer.o)
      mo::CmoParam::WriteToStream(void*, mo::STREAM_STATE*) in myLibrary.a(moParams.o)
      ParseLog(std::string const&, unsigned int&, CmoDateTime&, int&, std::string&) in myLibrary.a(AppLog.o)
      CAppLog::LogExists(unsigned int) in myLibrary.a(AppLog.o)
      ...

库有点旧，我不确定是否存在兼容性问题。我不打算支持iOS 6，所以我需要将部署目标设置为7.0。任何类型的帮助/方向都会很棒。

Libraries are a bit old, I am not sure if there is a compatibility issue. I am not planning to support iOS 6 so I need to set the deployment target as 7.0. Any kind of help/direction would be great.

推荐答案

事实证明，如果XCode找不到任何C ++文件项目，然后它假定不需要libstd ++。因此，您必须手动将C ++文件添加到项目中（空的.mm文件就足够了）。这就是解决方案。

It turns out that if XCode can't find any C++ files in the project, then it assumes that libstd++ is not required. So, you have to manually add a C++ file to the project (an empty .mm file would be enough). That is the solution.

所有学分转到答案在此 Stackoverflow主题中。

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