Compiling to get armv7s slice - ios

Question

I am compiling libraries in the terminal with the following command to get an armv7 slice:
./configure CC=/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2 --host=arm
NOTE: I also change the ldflags, sysroot to provide the relevant path, although I don´t show that here to keep this short.
I have successfully generated code slices for: i686, i386 and armv7 and combined them, but I can´t get an armv7s slice.
What settings do I use for armv7s code slice?

Answer 1

You should specify -arch armv7s in CFLAGS. Below is what I use to build ICU:
INSTALL=`pwd`/..
if [ $# -eq 0 ]
then
$0 armv7 iPhoneOS
$0 armv7s iPhoneOS
$0 i386 iPhoneSimulator
mkdir -p $INSTALL/universal/lib
cd $INSTALL/armv7/lib
for f in *.a
do
echo $f
xcrun -sdk iphoneos lipo -output ../../universal/lib/$f -create -arch armv7 $f -arch armv7s ../../armv7s/lib/$f -arch i386 ../../i386/lib/$f
done
#cd ../..
else
echo $1 $2
ARCH=$1
PLATFORM=$2
TOOLCHAIN=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
export CC="$TOOLCHAIN/usr/bin/clang"
DEVROOT=/Applications/Xcode.app/Contents/Developer/Platforms/$PLATFORM.platform/Developer
SDK=6.1
SDKROOT=$DEVROOT/SDKs/$PLATFORM$SDK.sdk
export CFLAGS="-arch $ARCH -isysroot $SDKROOT -miphoneos-version-min=5.0 -I/Users/xxx/icu/source/tools/tzcode"
export CXXFLAGS="$CFLAGS"
gnumake distclean
../../icu/source/configure --host=arm-apple-darwin --enable-static --disable-shared --with-cross-build=/Users/xxx/icu-build/mac --prefix=$INSTALL/$ARCH
gnumake
gnumake install
fi
You could do something similar to get what you want.
EDIT: How to call make with clang:
export CFLAGS=-arch armv7s # add more compiler flags as needed here
export CC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
make

Answer 2

I've combined the crt.1.x.x.0, libarclite, and libclang Xcode of the three current device architectures in order to support armv6, armv7, and armv7s for my iOS app.
Original Stack Overflow post that helped me: https://stackoverflow.com/a/12836808/761902.
Since you are trying to compile a ARM (conventional iOS device) and Intel (OS X computer) architectures into one file, you can try getting the crt, libarclite, and libclang files specified in the original post.
As the ARM files were located under
Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/,
I would expect the equivalent i386 files to be located under
Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/
, I'm not sure what Xcode build platform i686 falls under since I don't recall seeing that before, but if it is a iPhoneSimulator.platform, it would be in the same files as the i386 platform.
You might also want to add i686 and i386 to your build settings. The below are my architecture settings for building for armv6, armv7, and armv7s.
If that doesn't work, you can also build i686, i386, and armv7s separately and merge the built binaries with lipo.