title: How to build fat static library for armv6,armv7 and i386
body: <p>I followed the guide at <a href="https://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4/3647187#3647187">Build fat static library (device + simulator) using Xcode and SDK 4+</a> to build the libmms ( <a href="https://github.com/kosher-penguin/xcode-libmms" rel="nofollow noreferrer">https://github.com/kosher-penguin/xcode-libmms</a> ), and got a fat static library, but it seems not work. I got errors when add the library to my project(xCode4.2+iOS5.0):</p>
  
  <pre><code>Undefined symbols for architecture armv7:
    "_iconv_close", referenced from:
        _mms_connect in libMMS.a(mms.o)
    "_Status_GetNewStatusByKey", referenced from:
        _report_progress in libMMS.a(mms.o)
    "_Status_SetNewStatusByKey", referenced from:
        _report_progress in libMMS.a(mms.o)
    "_iconv", referenced from:
        _string_utf16 in libMMS.a(mms.o)
    "_iconv_open", referenced from:
        _mms_connect in libMMS.a(mms.o)
  ld: symbol(s) not found for architecture armv7
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  
  <p>Firstly,I clone the code from <a href="https://github.com/kosher-penguin/xcode-libmms.git" rel="nofollow noreferrer">https://github.com/kosher-penguin/xcode-libmms.git</a> 
  Secondly, I open it with xCode4.2, and add the follow script to Run Script(Build Phases), and then run the project.
  Thirdly, I copy the file named libmms.a  in the folder named Release-universal, and then add the library to a new project.
  Fourthly, in the new project,add the header file from xcode-libmms project, import mms.h and mms_config.h, and call the function mms_connect, and then build it, but get the errors.</p>
  
  <pre><code>DEBUG_THIS_SCRIPT="false"
  
  if [ $DEBUG_THIS_SCRIPT = "true" ]
  then
  echo "########### TESTS #############"
  echo "Use the following variables when debugging this script; note that they may change on recursions"
  echo "BUILD_DIR = $BUILD_DIR"
  echo "BUILD_ROOT = $BUILD_ROOT"
  echo "CONFIGURATION_BUILD_DIR = $CONFIGURATION_BUILD_DIR"
  echo "BUILT_PRODUCTS_DIR = $BUILT_PRODUCTS_DIR"
  echo "CONFIGURATION_TEMP_DIR = $CONFIGURATION_TEMP_DIR"
  echo "TARGET_BUILD_DIR = $TARGET_BUILD_DIR"
  fi
  
  #####################[ part 1 ]##################
  # First, work out the BASESDK version number (NB: Apple ought to report this, but they hide it)
  #    (incidental: searching for substrings in sh is a nightmare! Sob)
  
  SDK_VERSION=$(echo ${SDK_NAME} | grep -o '.\{3\}$')
  
  # Next, work out if we're in SIM or DEVICE
  
  if [ ${PLATFORM_NAME} = "iphonesimulator" ]
  then
  OTHER_SDK_TO_BUILD=iphoneos${SDK_VERSION}
  else
  OTHER_SDK_TO_BUILD=iphonesimulator${SDK_VERSION}
  fi
  
  echo "XCode has selected SDK: ${PLATFORM_NAME} with version: ${SDK_VERSION} (although back-targetting: ${IPHONEOS_DEPLOYMENT_TARGET})"
  echo "...therefore, OTHER_SDK_TO_BUILD = ${OTHER_SDK_TO_BUILD}"
  #
  #####################[ end of part 1 ]##################
  
  #####################[ part 2 ]##################
  #
  # IF this is the original invocation, invoke WHATEVER other builds are required
  #
  # Xcode is already building ONE target...
  #
  # ...but this is a LIBRARY, so Apple is wrong to set it to build just one.
  # ...we need to build ALL targets
  # ...we MUST NOT re-build the target that is ALREADY being built: Xcode WILL CRASH YOUR COMPUTER if you try this (infinite recursion!)
  #
  #
  # So: build ONLY the missing platforms/configurations.
  
  if [ "true" == ${ALREADYINVOKED:-false} ]
  then
  echo "RECURSION: I am NOT the root invocation, so I'm NOT going to recurse"
  else
  # CRITICAL:
  # Prevent infinite recursion (Xcode sucks)
  export ALREADYINVOKED="true"
  
  echo "RECURSION: I am the root ... recursing all missing build targets NOW..."
  echo "RECURSION: ...about to invoke: xcodebuild -configuration \"${CONFIGURATION}\" -target \"${TARGET_NAME}\" -sdk \"${OTHER_SDK_TO_BUILD}\" ${ACTION} RUN_CLANG_STATIC_ANALYZER=NO"
  xcodebuild -configuration "${CONFIGURATION}" -target "${TARGET_NAME}" -sdk "${OTHER_SDK_TO_BUILD}" ${ACTION} RUN_CLANG_STATIC_ANALYZER=NO BUILD_DIR="${BUILD_DIR}" BUILD_ROOT="${BUILD_ROOT}"
  
  ACTION="build"
  
  #Merge all platform binaries as a fat binary for each configurations.
  
  # Calculate where the (multiple) built files are coming from:
  CURRENTCONFIG_DEVICE_DIR=${SYMROOT}/${CONFIGURATION}-iphoneos
  CURRENTCONFIG_SIMULATOR_DIR=${SYMROOT}/${CONFIGURATION}-iphonesimulator
  
  echo "Taking device build from: ${CURRENTCONFIG_DEVICE_DIR}"
  echo "Taking simulator build from: ${CURRENTCONFIG_SIMULATOR_DIR}"
  
  CREATING_UNIVERSAL_DIR=${SYMROOT}/${CONFIGURATION}-universal
  echo "...I will output a universal build to: ${CREATING_UNIVERSAL_DIR}"
  
  # ... remove the products of previous runs of this script
  #      NB: this directory is ONLY created by this script - it should be safe to delete!
  
  rm -rf "${CREATING_UNIVERSAL_DIR}"
  mkdir "${CREATING_UNIVERSAL_DIR}"
  
  #
  echo "lipo: for current configuration (${CONFIGURATION}) creating output file: ${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}"
  lipo -create -output "${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}" "${CURRENTCONFIG_DEVICE_DIR}/${EXECUTABLE_NAME}" "${CURRENTCONFIG_SIMULATOR_DIR}/${EXECUTABLE_NAME}"
  
  #########
  #
  # Added: StackOverflow suggestion to also copy "include" files
  #    (untested, but should work OK)
  #
  if [ -d "${CURRENTCONFIG_DEVICE_DIR}/usr/local/include" ]
  then
  mkdir -p "${CREATING_UNIVERSAL_DIR}/usr/local/include"
  # * needs to be outside the double quotes?
  cp "${CURRENTCONFIG_DEVICE_DIR}/usr/local/include/"* "${CREATING_UNIVERSAL_DIR}/usr/local/include"
  fi
  fi
  </code></pre>
  
  <p>Please give me some help, thank you.</p>
  
  <p>update:
  After add libiconv library, the error as follow:</p>
  
  <pre><code>Undefined symbols for architecture armv7:
    "_Status_GetNewStatusByKey", referenced from:
        _report_progress in libMMS.a(mms.o)
    "_Status_SetNewStatusByKey", referenced from:
        _report_progress in libMMS.a(mms.o)
  ld: symbol(s) not found for architecture armv7
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>