title: Duplicate symbol error in Xcode
body: <p>I am encountering 'duplicate symbol' errors in Xcode 4.5.1 when I try to build a project after adding my own framework. I verified the framework files for duplicates and there are none. But when I add the framework to a project, it complains with these error. Please suggest..</p>
  
  <pre><code>duplicate symbol _NXArgc in:
      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o
  /Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
  
  duplicate symbol _NXArgv in:
  /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o
  /Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
  
  duplicate symbol ___progname in:
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o
  /Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
  
  duplicate symbol _environ in:
  /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o
  /Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
  
  duplicate symbol start in:
  /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o
  /Users/idcc/Test/MyFW/Products/MyTestFW.framework/MyTestFW
  ld: 8 duplicate symbols for architecture armv7
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  
  <p>Thanks in advance..</p>