Environment: XCode 7.0.1 Module: Objective-C Bundle Type: Framework
Hi, I am trying to create a framework to support armv7, armv7s, arm64, i386 and x86_64. I am using aggregate to make the fat library. Inside the aggregate script, i am running two xcodebuild commands 1. for armv7, armv7s and arm64 and 2. for i386 and x86_64 architectures. Also, I have set Enable Bitcode=YES and Other C Flags=-fembed-bitcode under target build settings. As a precautionary mesasure, i am adding ENABLE_BITCODE=YES and OTHER_CFLAGS="-fembed-bitcode" options to the xcodebuild command
My xcode build commands are as follows -
#Build The framework Target for iPhoneOS
xcodebuild -project "${PROJECT_FILE_PATH}" -target "${AN_TARGET}"
ONLY_ACTIVE_ARCH=NO -configuration "${CONFIGURATION}" -sdk iphoneos
BUILD_DIR="${BUILD_DIR}" OBJROOT="${OBJROOT}" BUILD_ROOT="${BUILD_ROOT}"
CONFIGURATION_BUILD_DIR="${IPHONE_DEVICE_BUILD_DIR}" SYMROOT="${SYMROOT}"
ARCHS="armv7 armv7s arm64" ENABLE_BITCODE=YES OTHER_CFLAGS="-fembed-bitcode" $ACTION
#Build The framework Target for iPhoneSimulator
xcodebuild -project "${PROJECT_FILE_PATH}" -target "${AN_TARGET}"
ONLY_ACTIVE_ARCH=NO -configuration "${CONFIGURATION}" -sdk iphonesimulator
BUILD_DIR="${BUILD_DIR}" OBJROOT="${OBJROOT}" BUILD_ROOT="${BUILD_ROOT}"
CONFIGURATION_BUILD_DIR="${IPHONE_SIMULATOR_BUILD_DIR}" SYMROOT="${SYMROOT}"
ARCHS="i386 x86_64" ENABLE_BITCODE=YES OTHER_CFLAGS="-fembed-bitcode" $ACTION
after running the above two commands, i am combining these two builds to make a fat framework binary using the below command
# create a fat Framework
lipo -create
"${IPHONE_DEVICE_BUILD_DIR}/${PROJECT_NAME}.framework/${PROJECT_NAME}"
"${IPHONE_SIMULATOR_BUILD_DIR}/${PROJECT_NAME}.framework/${PROJECT_NAME}" -
output "${FRAMEWORK_FOLDER}/${AN_END_USER_FRAMEWORK_NAME}"
The issue iam facing is after the lipo is created, i am unable to use it in the bitcode enabled application. After running the otool -l framework_binary | grep -LLVM, i do not see the bitcode enabled flags or __LLVM.
Lipo removes bitcode from the fat binary. Is there a way i can retain bitcode while running the lipo command?
Correction: Based on the reply from Nestor, i ran the otool command as otool -l -arch armv7 framework_binary | grep LLVM and much to my surprise, i could see the segname __LLVM clang. However when i integrate the same fat framework binary into my project, it builds fine on simulator however throws the following error while running on device - ld: 'MyBinary' does not contain bitcode. You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target. for architecture armv7
This is something weird, there are not many documentation for do this, at the end I use this command:
xcodebuild -project ${PROJECT_NAME}.xcodeproj -target ${FRAMEWORK_NAME} ONLY_ACTIVE_ARCH=NO BITCODE_GENERATION_MODE=bitcode FRAMEWORK_SEARCH_PATHS="${FRAMEWORK_SEARCH_PARTH} ${SRCROOT}/**" -sdk ${SIMULATOR_SDK} -configuration ${CONFIGURATION} clean build CONFIGURATION_BUILD_DIR=${BUILD_DIR}/${CONFIGURATION}-${SIMULATOR_SDK} 2>&1
xcodebuild -project ${PROJECT_NAME}.xcodeproj -target ${FRAMEWORK_NAME} -sdk ${DEVICE_SDK} ONLY_ACTIVE_ARCH=NO BITCODE_GENERATION_MODE=bitcode FRAMEWORK_SEARCH_PATHS="${FRAMEWORK_SEARCH_PARTH} ${SRCROOT}/**" -configuration ${CONFIGURATION} clean build CONFIGURATION_BUILD_DIR=${BUILD_DIR}/${CONFIGURATION}-${DEVICE_SDK} 2>&1
Add the BITCODE_GENERATION_MODE=bitcode flag to the xcodebuild command
Happily it's just a problem with otool's reporting, not lipo; you have to add the -arch parameter:
otool -arch arm64 -l myLipoOutput.a
Try to use archive for the arm slices instead of build
xcodebuild -scheme "${SCHEME}" -workspace "${WORKSPACE}" -configuration "${CONFIGURATION}" -sdk iphoneos ARCHS="arm64 armv7 armv7s" CONFIGURATION_BUILD_DIR="${CONFIGURATION_BUILD_DIR}/arm" CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO ONLY_ACTIVE_ARCH=NO archive
After that run lipo to merge the simulator and the arm ones.
And after that run otool -arch arm64 -l myLipoOutput.a and it should work.
It looks like a bug in Xcode 7.0.1 . I've had the same issue and downgrading Xcode to version 7 fixed it.
Update: Actually it may be a bug in Xcode 7 that was fixed in 7.0.1 - this SO answer solved the issue for me.
来源：https://stackoverflow.com/questions/33106117/how-do-i-make-fat-framework-with-bitcode-option