Build_IOS.sh

#!/bin/bash

set -ex

if [[ -z "${PROTOBUF_UE4_VERSION}" ]]; then
  echo "PROTOBUF_UE4_VERSION is not set, exit."
  exit 1
else
  echo "PROTOBUF_UE4_VERSION: ${PROTOBUF_UE4_VERSION}"
fi

if [[ -z "${PROTOBUF_UE4_PREFIX}" ]]; then
  echo "PROTOBUF_UE4_PREFIX is not set, exit."
  exit 1
else
  echo "PROTOBUF_UE4_PREFIX: ${PROTOBUF_UE4_PREFIX}"
fi

if [[ -z "${PROTOBUF_UE4_IOS_DEPLOYMENT_TARGET}" ]]; then
  echo "PROTOBUF_UE4_IOS_DEPLOYMENT_TARGET is not set, exit."
  exit 1
else
  echo "PROTOBUF_UE4_IOS_DEPLOYMENT_TARGET: ${PROTOBUF_UE4_IOS_DEPLOYMENT_TARGET}"
fi

readonly CORE_COUNT=$(sysctl -n machdep.cpu.core_count)
readonly PROTOBUF_URL=https://github.com/google/protobuf/releases/download/v${PROTOBUF_UE4_VERSION}/protobuf-cpp-${PROTOBUF_UE4_VERSION}.tar.gz
readonly PROTOBUF_DIR=protobuf-${PROTOBUF_UE4_VERSION}
readonly PROTOBUF_TAR=${PROTOBUF_DIR}.tar.gz

mkdir -p "${PROTOBUF_UE4_PREFIX}"

echo "Downloading: ${PROTOBUF_URL}"
wget -q -O ${PROTOBUF_TAR} ${PROTOBUF_URL}
tar zxf ${PROTOBUF_TAR}

pushd ${PROTOBUF_DIR}/cmake
  cmake -DCMAKE_INSTALL_PREFIX="${PROTOBUF_UE4_PREFIX}" . -G "Xcode"
  xcodebuild -project protobuf.xcodeproj                               \
    -target libprotobuf                                                \
    -configuration Release                                             \
    -sdk iphoneos                                                      \
    -arch arm64                                                        \
    IPHONEOS_DEPLOYMENT_TARGET=${PROTOBUF_UE4_IOS_DEPLOYMENT_TARGET}   \
    GCC_SYMBOLS_PRIVATE_EXTERN=YES                                     \
    -jobs ${CORE_COUNT}                                                \
    build
  xcodebuild -target install build

  # TODO: delete the code below, shoud use xcodebuild config.
  mv Release-iphoneos/libprotobuf.a "${PROTOBUF_UE4_PREFIX}/lib/libprotobuf.a"

  lipo -info "${PROTOBUF_UE4_PREFIX}/lib/libprotobuf.a"
popd