build-libevent.sh

#!/bin/bash
#  Builds libevent for all three current iPhone targets: iPhoneSimulator-i386,
#  iPhoneOS-armv6, iPhoneOS-armv7.
#
#  Copyright 2012 Mike Tigas <mike@tig.as>
#
#  Based on work by Felix Schulze on 16.12.10.
#  Copyright 2010 Felix Schulze. All rights reserved.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#  http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#
###########################################################################
#  Choose your libevent version and your currently-installed iOS SDK version:
#
VERSION="2.0.21-stable"
SDKVERSION="7.1"
MINIOSVERSION="6.0"
VERIFYGPG=true

###########################################################################
#
# Don't change anything under this line!
#
###########################################################################

# No need to change this since xcode build will only compile in the
# necessary bits from the libraries we create
ARCHS="i386 x86_64 armv7 armv7s arm64"

DEVELOPER=`xcode-select -print-path`
#DEVELOPER="/Applications/Xcode.app/Contents/Developer"

if [ "$1" == "--noverify" ]; then
  VERIFYGPG=false
fi
if [ "$2" == "--i386only" ]; then
  ARCHS="i386"
fi

cd "`dirname \"$0\"`"
REPOROOT=$(pwd)

# Where we'll end up storing things in the end
OUTPUTDIR="${REPOROOT}/dependencies"
mkdir -p ${OUTPUTDIR}/include
mkdir -p ${OUTPUTDIR}/lib


BUILDDIR="${REPOROOT}/build"

# where we will keep our sources and build from.
SRCDIR="${BUILDDIR}/src"
mkdir -p $SRCDIR
# where we will store intermediary builds
INTERDIR="${BUILDDIR}/built"
mkdir -p $INTERDIR

########################################

cd $SRCDIR

# Exit the script if an error happens
set -e

if [ ! -e "${SRCDIR}/libevent-${VERSION}.tar.gz" ]; then
	echo "Downloading libevent-${VERSION}.tar.gz"
	curl -LO https://github.com/downloads/libevent/libevent/libevent-${VERSION}.tar.gz
fi
echo "Using libevent-${VERSION}.tar.gz"

# up to you to set up `gpg` and add keys to your keychain
# may have to import from link on http://www.wangafu.net/~nickm/ or http://www.citi.umich.edu/u/provos/
if $VERIFYGPG; then
	if [ ! -e "${SRCDIR}/libevent-${VERSION}.tar.gz.asc" ]; then
		curl -LO https://github.com/downloads/libevent/libevent/libevent-${VERSION}.tar.gz.asc
	fi
	echo "Using libevent-${VERSION}.tar.gz.asc"
	if out=$(gpg --status-fd 1 --verify "libevent-${VERSION}.tar.gz.asc" "libevent-${VERSION}.tar.gz" 2>/dev/null) &&
	echo "$out" | grep -qs "^\[GNUPG:\] VALIDSIG"; then
		echo "$out" | egrep "GOODSIG|VALIDSIG"
		echo "Verified GPG signature for source..."
	else
		echo "$out" >&2
		echo "COULD NOT VERIFY PACKAGE SIGNATURE..."
		exit 1
	fi
fi

tar zxf libevent-${VERSION}.tar.gz -C $SRCDIR
cd "${SRCDIR}/libevent-${VERSION}"

set +e # don't bail out of bash script if ccache doesn't exist
CCACHE=`which ccache`
if [ $? == "0" ]; then
	echo "Building with ccache: $CCACHE"
	CCACHE="${CCACHE} "
else
	echo "Building without ccache"
	CCACHE=""
fi
set -e # back to regular "bail out on error" mode

export ORIGINALPATH=$PATH

for ARCH in ${ARCHS}
do
	if [ "${ARCH}" == "i386" ] || [ "${ARCH}" == "x86_64" ];
	then
		PLATFORM="iPhoneSimulator"
		EXTRA_CONFIG=""
	else
		PLATFORM="iPhoneOS"
		EXTRA_CONFIG="--host=arm-apple-darwin11"
	fi

	mkdir -p "${INTERDIR}/${PLATFORM}${SDKVERSION}-${ARCH}.sdk"

	export PATH="${DEVELOPER}/Toolchains/XcodeDefault.xct‌​oolchain/usr/bin:${DEVELOPER}/usr/bin:${ORIGINALPATH}"
	export CC="${CCACHE}`which gcc` -arch ${ARCH} -miphoneos-version-min=${MINIOSVERSION}"

	./configure --disable-shared --enable-static --disable-debug-mode ${EXTRA_CONFIG} \
    --prefix="${INTERDIR}/${PLATFORM}${SDKVERSION}-${ARCH}.sdk" \
    LDFLAGS="$LDFLAGS -L${OUTPUTDIR}/lib" \
    CFLAGS="$CFLAGS -O2 -I${OUTPUTDIR}/include -isysroot ${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDKVERSION}.sdk" \
    CPPFLAGS="$CPPFLAGS -I${OUTPUTDIR}/include -isysroot ${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDKVERSION}.sdk"

    # Build the application and install it to the fake SDK intermediary dir
    # we have set up. Make sure to clean up afterward because we will re-use
    # this source tree to cross-compile other targets.
	make -j4
	make install
	make clean
done

########################################

echo "Build library..."

# These are the libs that comprise libevent. `libevent_openssl` and `libevent_pthreads`
# may not be compiled if those dependencies aren't available.
OUTPUT_LIBS="libevent.a libevent_core.a libevent_extra.a libevent_openssl.a libevent_pthreads.a"
for OUTPUT_LIB in ${OUTPUT_LIBS}; do
	INPUT_LIBS=""
	for ARCH in ${ARCHS}; do
		if [ "${ARCH}" == "i386" ] || [ "${ARCH}" == "x86_64" ];
		then
			PLATFORM="iPhoneSimulator"
		else
			PLATFORM="iPhoneOS"
		fi
		INPUT_ARCH_LIB="${INTERDIR}/${PLATFORM}${SDKVERSION}-${ARCH}.sdk/lib/${OUTPUT_LIB}"
		if [ -e $INPUT_ARCH_LIB ]; then
			INPUT_LIBS="${INPUT_LIBS} ${INPUT_ARCH_LIB}"
		fi
	done
	# Combine the three architectures into a universal library.
	if [ -n "$INPUT_LIBS"  ]; then
		lipo -create $INPUT_LIBS \
		-output "${OUTPUTDIR}/lib/${OUTPUT_LIB}"
	else
		echo "$OUTPUT_LIB does not exist, skipping (are the dependencies installed?)"
	fi
done

for ARCH in ${ARCHS}; do
	if [ "${ARCH}" == "i386" ] || [ "${ARCH}" == "x86_64" ];
	then
		PLATFORM="iPhoneSimulator"
	else
		PLATFORM="iPhoneOS"
	fi
	cp -R ${INTERDIR}/${PLATFORM}${SDKVERSION}-${ARCH}.sdk/include/* ${OUTPUTDIR}/include/
	if [ $? == "0" ]; then
		# We only need to copy the headers over once. (So break out of forloop
		# once we get first success.)
		break
	fi
done


####################

echo "Building done."
echo "Cleaning up..."
rm -fr ${INTERDIR}
rm -fr "${SRCDIR}/libevent-${VERSION}"
echo "Done."