How do i compile a static library (fat) for armv6, armv7 and i386

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Here is a good solution I found: Static Libs With Support to iOS 5 and Arm64

Edited:

The solution is to build different architectures separated then bind them using lipo, by using command line (or Rakefile).

First build the binary with arm using xcodebuild:

xcodebuild -project 'StaticLibDemo.xcodeproj' -configuration 'Release' -sdk 'iphoneos7.0' clean build ARCHS='armv7 armv7s' IPHONEOS_DEPLOYMENT_TARGET='5.0' TARGET_BUILD_DIR='./build-arm' BUILT_PRODUCTS_DIR='./build-arm'

Note that you must set IPHONEOS_DEPLOYMENT_TARGET=’5.0′ and ARCHS=’armv7 armv7s’, it’s recommended to set build and product dirs to make the things more clear, take a look at Build Setting Reference for more details what this flags means.

Next build for arm64:

xcodebuild -project 'StaticLibDemo.xcodeproj' -configuration 'Release' -sdk 'iphoneos7.0' clean build ARCHS='arm64' IPHONEOS_DEPLOYMENT_TARGET='7.0' TARGET_BUILD_DIR='./build-arm64' BUILT_PRODUCTS_DIR='./build-arm64'

Note the difference on ARCHS and IPHONEOS_DEPLOYMENT_TARGET. We also need to build for simulator, in this case we have to change the sdk to iphonesimulator7.0 and build in two steps first for i386:

xcodebuild -project 'StaticLibDemo.xcodeproj' -configuration 'Release' -sdk 'iphonesimulator7.0' clean build ARCHS='i386' IPHONEOS_DEPLOYMENT_TARGET='5.0' TARGET_BUILD_DIR='./build-i386' BUILT_PRODUCTS_DIR='./build-i386'

Now the tricky part! If you just change the ARCHS to x86_86 depending on your Xcode setting you will got an error like: “x86_64 is not a valid arch”. To avoid this just add VALID_ARCHS=’x86_64′:

xcodebuild -project 'StaticLibDemo.xcodeproj' -configuration 'Release' -sdk 'iphonesimulator7.0' clean build ARCHS='x86_64' VALID_ARCHS='x86_64' IPHONEOS_DEPLOYMENT_TARGET='7.0' TARGET_BUILD_DIR='./build-x86_64' BUILT_PRODUCTS_DIR='./build-x86_64'

Finally we just have to create a fat binary with all the 5 architectures:

lipo -create './build-arm/libStaticLibDemo.a' './build-arm64/libStaticLibDemo.a' './build-i386/libStaticLibDemo.a' './build-x86_64/libStaticLibDemo.a' -output 'libStaticLibDemo.a'

The author created a working example of this, you can get it: https://github.com/diogot/StaticLibDemo

Here is the Link to the post: Static Libs With Support to iOS 5 and Arm64

All credits go to Diogo Tridapalli.

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