title: Apple Mach-O Linker Error with third party SDK
body: <p>I've gone through all the Mach-O linker error entries in stackoverflow but could not solve the issue. Please refer to the following information : </p>
  
  <ol>
  <li>I am using a third party SDK framework in my application.</li>
  <li>XCode 5.1, iOS7.1 SDK, iPad Application</li>
  <li>Mach-O linker error arises from the addition of the SDK.</li>
  <li>I tested with two different projects;
  <ol>
  <li>SDK provider's sample app. BULIDS FINE AND COMPILES FINE; Search path is empty, the SDK framework is within the project directory, Don't Create Position Independent Executables:YES, Mach-O Type:Executable</li>
  </ol></li>
  <li>Created a different app from scratch, THROWS MACH-O LINKER ERROR;Search path is empty, the SDK framework is within the project directory, Don't Create Position Independent Executables:YES, Mach-O Type:Executable. I added all the frameworks in the sample app, also imported all the class and header files I needed from it.</li>
  <li><p>If I remove search path, it can not discover the SDK framework, so I have to add it again.</p>
  
  <pre><code>Undefined symbols for architecture i386:
  "std::string::find_last_of(char const*, unsigned long) const", referenced from:
  talk_base::Pathname::SetPathname(std::string const&amp;) in ACBClientSDK(pathutils.o)
  talk_base::Pathname::folder_name() const in ACBClientSDK(pathutils.o)
  talk_base::Pathname::parent_folder() const in ACBClientSDK(pathutils.o)
  "std::string::find_last_of(char, unsigned long) const", referenced from:
  buzz::SuggestPrefix(std::string const&amp;) in ACBClientSDK(xmlnsstack.o)
  "std::string::find_first_of(char const*, unsigned long) const", referenced from:
  webrtc::DtmfSender::DoInsertDtmf() in ACBClientSDK(dtmfsender.o)
  talk_base::Pathname::SetBasename(std::string const&amp;) in ACBClientSDK(pathutils.o)
  talk_base::Pathname::SetExtension(std::string const&amp;) in ACBClientSDK(pathutils.o)
  buzz::XmlPrinterImpl::PrintQuotedValue(std::string const&amp;) in   ACBClientSDK(xmlprinter.o)
  buzz::XmlPrinterImpl::PrintBodyText(std::string const&amp;) in ACBClientSDK(xmlprinter.o)
  "std::string::find_first_of(char, unsigned long) const", referenced from:
  talk_base::Pathname::SetExtension(std::string const&amp;) in ACBClientSDK(pathutils.o)
  "std::string::find_last_not_of(char const*, unsigned long) const", referenced from:
  talk_base::string_trim(std::string const&amp;) in ACBClientSDK(stringutils.o)
  "std::string::find_first_not_of(char const*, unsigned long) const", referenced from:
  talk_base::string_trim(std::string const&amp;) in ACBClientSDK(stringutils.o)
  </code></pre></li>
  </ol>
  
  <p>How can I solve the issue? Looking forward to your responses! Thanks in advance!</p>