How do i make fat framework with bitcode option?

Question

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

Answer 1

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

Source: http://www.openradar.me/radar?id=6301306440384512