Xcode - symbol(s) not found for architecture x86_64 (iOS Lib)

Question

I am building a static library. The build setting has the Architectures set to: $(ARCHS_STANDARD) which is shown as Standard Architectures (armv7, armv7s, arm64) I build the lib choosing iOS Device AND then using the simulator (for example iPhone Retina).

Now that I have two builds (one inside Debug-iphoneos and the other inside Debug-iphonesimulator, I use lipo -create to create the aggregated lib:

lipo -create path/to/first/lib /path/to/second/lib -o MyLib.a 

If I used this library in another project to simulate on any iOS device with 64-bit architecture, it gives symbol(s) not found for architecture x86_64. What really makes me so angry that the lib project itself is inside a workspace with another project that use the lib. I can simulate on 64-bit iOS simulator! (on all simulators and devices for that matter). What am I doing wrong?

Notes:

1. This is not duplicate Q. Before accusing me of that (since this is my second day trying to fix this stupid issue), I did search on Stack and Google. All answers don't help.
2. I am using Xcode 5.1.1.

Answer 1

I had the same trouble with building static library.
Finally I have found the basic solution. (You need to build universal library for x86_64/armv7/armv7s/arm64)

1) Click on the project file
2) Click on the target
3) Open "Build Phases"
4) Open "Run Script"
5) Add "/bin/sh" and the script below

 ########################################## # # c.f. http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 # # Version 2.7 # # Latest Change: # - Supports iPhone 5 / iPod Touch 5 (uses Apple's workaround to lipo bug) # # Purpose: #   Automatically create a Universal static library for iPhone + iPad + iPhone Simulator from within XCode # # Author: Adam Martin - http://twitter.com/redglassesapps # Based on: original script from Eonil (main changes: Eonil's script WILL NOT WORK in Xcode GUI - it WILL CRASH YOUR COMPUTER) #  set -e set -o pipefail  #################[ Tests: helps workaround any future bugs in Xcode ]######## # 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}\" -project \"${PROJECT_NAME}.xcodeproj\" -target \"${TARGET_NAME}\" -sdk \"${OTHER_SDK_TO_BUILD}\" ${ACTION} RUN_CLANG_STATIC_ANALYZER=NO" BUILD_DIR=\"${BUILD_DIR}\" BUILD_ROOT=\"${BUILD_ROOT}\" SYMROOT=\"${SYMROOT}\"  xcodebuild -configuration "${CONFIGURATION}" -project "${PROJECT_NAME}.xcodeproj" -target "${TARGET_NAME}" -sdk "${OTHER_SDK_TO_BUILD}" ${ACTION} RUN_CLANG_STATIC_ANALYZER=NO BUILD_DIR="${BUILD_DIR}" BUILD_ROOT="${BUILD_ROOT}" SYMROOT="${SYMROOT}"  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}" xcrun -sdk iphoneos 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) # echo "Fetching headers from ${PUBLIC_HEADERS_FOLDER_PATH}" echo "  (if you embed your library project in another project, you will need to add" echo "   a "User Search Headers" build setting of: (NB INCLUDE THE DOUBLE QUOTES BELOW!)" echo '        "$(TARGET_BUILD_DIR)/usr/local/include/"' if [ -d "${CURRENTCONFIG_DEVICE_DIR}${PUBLIC_HEADERS_FOLDER_PATH}" ] then mkdir -p "${CREATING_UNIVERSAL_DIR}${PUBLIC_HEADERS_FOLDER_PATH}" # * needs to be outside the double quotes? cp -r "${CURRENTCONFIG_DEVICE_DIR}${PUBLIC_HEADERS_FOLDER_PATH}"* "${CREATING_UNIVERSAL_DIR}${PUBLIC_HEADERS_FOLDER_PATH}" fi fi 

6) Hit "cmd + B" (Build Project)

7) Open Product in Finder

8) Navigate 1 directory up ("cmd + ↑"), and you will see "Release-universal" directory.

There will be your "fat/universal" library, You are ready to go!