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#!/bin/sh

PLATFORM_IOS=/Developer/Platforms/iPhoneOS.platform/
PLATFORM_IOS_SIM=/Developer/Platforms/iPhoneSimulator.platform/
SDK_IOS_VERSION="4.2"
MIN_IOS_VERSION="3.0"
OUTPUT_DIR="universal-ios"

build_target () {
    local platform=$1
    local sdk=$2
    local arch=$3
    local triple=$4
    local builddir=$5

    mkdir -p "${builddir}"
    pushd "${builddir}"
    export CC="${platform}"/Developer/usr/bin/gcc-4.2
    export CFLAGS="-arch ${arch} -isysroot ${sdk} -miphoneos-version-min=${MIN_IOS_VERSION}"
    ../configure --host=${triple} && make
    popd
}

# Build all targets
build_target "${PLATFORM_IOS}" "${PLATFORM_IOS}/Developer/SDKs/iPhoneOS${SDK_IOS_VERSION}.sdk/" armv6 arm-apple-darwin10 armv6-ios
build_target "${PLATFORM_IOS}" "${PLATFORM_IOS}/Developer/SDKs/iPhoneOS${SDK_IOS_VERSION}.sdk/" armv7 arm-apple-darwin10 armv7-ios
build_target "${PLATFORM_IOS_SIM}" "${PLATFORM_IOS_SIM}/Developer/SDKs/iPhoneSimulator${SDK_IOS_VERSION}.sdk/" i386 i386-apple-darwin10 i386-ios-sim

# Create universal output directories
mkdir -p "${OUTPUT_DIR}"
mkdir -p "${OUTPUT_DIR}/include"
mkdir -p "${OUTPUT_DIR}/include/armv6"
mkdir -p "${OUTPUT_DIR}/include/armv7"
mkdir -p "${OUTPUT_DIR}/include/i386"

# Create the universal binary
lipo -create armv6-ios/.libs/libffi.a armv7-ios/.libs/libffi.a i386-ios-sim/.libs/libffi.a -output "${OUTPUT_DIR}/libffi.a"

# Copy in the headers
copy_headers () {
    local src=$1
    local dest=$2

    # Fix non-relative header reference
    sed 's/<ffitarget.h>/"ffitarget.h"/' < "${src}/include/ffi.h" > "${dest}/ffi.h"
    cp "${src}/include/ffitarget.h" "${dest}"
}

copy_headers armv6-ios "${OUTPUT_DIR}/include/armv6"
copy_headers armv7-ios "${OUTPUT_DIR}/include/armv7"
copy_headers i386-ios-sim "${OUTPUT_DIR}/include/i386"

# Create top-level header
(
cat << EOF
#ifdef __arm__
#include <arm/arch.h>
#ifdef _ARM_ARCH_6
#include "include/armv6/ffi.h"
#elif _ARM_ARCH_7
#include "include/armv7/ffi.h"
#endif
#elif defined(__i386__)
#include "include/i386/ffi.h"
#endif
EOF
) > "${OUTPUT_DIR}/ffi.h"
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