Scripts for building Gdal into a static library for iOS, build-gdal-combined-lib.sh will build a single lib with armv7 armv7s arm64 and simulator slices

build-gdal-combined-lib.sh

#!/bin/bash
PREFIX=`pwd`/install/
rm -rf $PREFIX
mkdir $PREFIX
LOG=./log
rm -rf $LOG
mkdir $LOG

if [ -e ${PREFIX} ]
then
	echo removing ${PREFIX}
	rm -rf ${PREFIX}
fi

mkdir ${PREFIX}

for f in "armv7" "armv7s" "arm64"; do
echo Building $f
./build_gdal_ios.sh -p ${PREFIX} -a $f device 2>&1 | tee "${LOG}/${f}.txt"
done

echo Building simulator
for f in "i386" "x86_64"; do
echo Building $f
./build_gdal_ios.sh -p ${PREFIX} -a $f simulator 2>&1 | tee "${LOG}/simulator.txt"
done


SDK_VERSION=8.3

lipo \
${PREFIX}/i386/iphonesimulator${SDK_VERSION}.sdk/lib/libgdal.a \
${PREFIX}/x86_64/iphonesimulator${SDK_VERSION}.sdk/lib/libgdal.a \
${PREFIX}/armv7/iphoneos${SDK_VERSION}.sdk/lib/libgdal.a \
${PREFIX}/armv7s/iphoneos${SDK_VERSION}.sdk/lib/libgdal.a \
${PREFIX}/arm64/iphoneos${SDK_VERSION}.sdk/lib/libgdal.a \
-output ${PREFIX}/libgdal.a \
-create | tee $LOG/lipo.txt

lipo \
${PREFIX}/i386/iphonesimulator${SDK_VERSION}.sdk/lib/libproj.a \
${PREFIX}/x86_64/iphonesimulator${SDK_VERSION}.sdk/lib/libproj.a \
${PREFIX}/armv7/iphoneos${SDK_VERSION}.sdk/lib/libproj.a \
${PREFIX}/armv7s/iphoneos${SDK_VERSION}.sdk/lib/libproj.a \
${PREFIX}/arm64/iphoneos${SDK_VERSION}.sdk/lib/libproj.a \
-output ${PREFIX}/libproj.a \
-create | tee $LOG/lipo-proj.txt

#create zipfile for cocoapods distribution
cd ${PREFIX}
mkdir GDAL
cp libgdal.a ${PREFIX}/libproj.a GDAL
cp arm64/iphoneos8.3.sdk/include/*.h GDAL
zip gdal.zip GDAL/*

build_gdal_ios.sh

#!/bin/bash
set -u

default_iphoneos_version=8.3
default_architecture=armv7

export IPHONEOS_DEPLOYMENT_TARGET="${IPHONEOS_DEPLOYMENT_TARGET:-$default_iphoneos_version}"
DEFAULT_ARCHITECTURE="${DEFAULT_ARCHITECTURE:-$default_architecture}"
DEFAULT_PREFIX="${HOME}/Desktop/iOS_GDAL"


usage ()
    {
cat >&2 << EOF
    Usage: ${0} [-h] [-p prefix] [-a arch] target [configure_args]
        -h  Print help message
        -p  Installation prefix (default: \$HOME/Documents/iOS_GDAL...)
        -a  Architecture target for compilation (default: armv7)

    The target must be "device" or "simulator".  Any additional arguments
    are passed to configure.

    The following environment variables affect the build process:

        IPHONEOS_DEPLOYMENT_TARGET  (default: $default_iphoneos_version)
        DEFAULT_PREFIX  (default: $default_prefix)
EOF
    }

prefix="${DEFAULT_PREFIX}"

while getopts ":hp:a:" opt; do
        case $opt in
        h  ) usage ; exit 0 ;;
        p  ) prefix="$OPTARG" ;;
        a  ) DEFAULT_ARCHITECTURE="$OPTARG" ;;
        \? ) usage ; exit 2 ;;
        esac
done
shift $(( $OPTIND - 1 ))

if (( $# < 1 )); then
    usage
    exit 2
fi

target=$1
shift

case $target in

        device )
        arch="${DEFAULT_ARCHITECTURE}"
        platform=iphoneos
        extra_cflags=" "
        ;;

        simulator )
        arch="${DEFAULT_ARCHITECTURE}"
        platform=iphonesimulator
        extra_cflags="-D__IPHONE_OS_VERSION_MIN_REQUIRED=${IPHONEOS_DEPLOYMENT_TARGET%%.*}0000"
        ;;

        * )
        echo No target found!!!
        usage
        exit 2

esac
if [ $arch = "arm64" ]
    then
    host="arm-apple-darwin"
else
    host="${arch}-apple-darwin"
fi

echo "building for host ${host}"

platform_dir=`xcrun -find -sdk ${platform} --show-sdk-platform-path`
platform_sdk_dir=`xcrun -find -sdk ${platform} --show-sdk-path`
prefix="${prefix}/${arch}/${platform}${IPHONEOS_DEPLOYMENT_TARGET}.sdk"

echo
echo library will be exported to $prefix

#setup compiler flags
export CC=`xcrun -find -sdk iphoneos gcc`
export CFLAGS="-Wno-error=implicit-function-declaration -arch ${arch} -pipe -Os -gdwarf-2 -isysroot ${platform_sdk_dir} ${extra_cflags}"
export LDFLAGS="-arch ${arch} -isysroot ${platform_sdk_dir}"
export CXX=`xcrun -find -sdk iphoneos g++`
export CXXFLAGS="${CFLAGS}"
export CPP=`xcrun -find -sdk iphoneos cpp`
export CXXCPP="${CPP}"

echo CFLAGS ${CFLAGS}

#set proj4 install destination
proj_prefix=$prefix
echo install proj to $proj_prefix

#download proj4 if necesary
if [ ! -e proj-4.8.0 ]
then
    echo proj4 missing, downloading
    wget http://download.osgeo.org/proj/proj-4.8.0.tar.gz
    tar -xzf proj-4.8.0.tar.gz
fi

#configure and build proj4
pushd proj-4.8.0

echo
echo "cleaning proj"
make clean

echo
echo "configure proj"
./configure \
    --prefix=${proj_prefix} \
    --enable-shared=no \
    --enable-static=yes \
    --host=$host \
    "$@" || exit

echo
echo "make install proj"
time make install || exit

popd

#download gdal if necesary
if [ ! -e gdal-1.11.2 ]
then
    wget http://download.osgeo.org/gdal/1.11.0/gdal-1.11.2.tar.gz
    tar -xzf gdal-1.11.2.tar.gz
fi

#configure and build gdal
cd gdal-1.11.2

echo "cleaning gdal"
make clean

echo
echo "configure gdal"
./configure \
    --prefix="${prefix}" \
    --host=$host \
    --disable-shared \
    --enable-static \
    --with-hide-internal-symbols \
    --with-unix-stdio-64=no \
    --with-geos=no \
    --without-pg \
    --without-grass \
    --without-libgrass \
    --without-cfitsio \
    --without-pcraster \
    --without-netcdf \
    --without-ogdi \
    --without-fme \
    --without-hdf4 \
    --without-hdf5 \
    --without-jasper \
    --without-kakadu \
    --without-grib \
    --without-mysql \
    --without-ingres \
    --without-xerces \
    --without-odbc \
    --without-curl \
    --without-idb \
    --without-sde \
    --with-sse=no \
    --with-avx=no \
    --with-static-proj4=${prefix} \
    --with-sqlite3=${platform_sdk_dir} \
    || exit

#echo '#include "cpl_config_extras.h"' >> port/cpl_config.h

echo
echo "building gdal"
time make

echo
echo "installing"
time make install

echo "Gdal build complete"

getting this error?
Undefined symbols for architecture x86_64:
"_iconv", referenced from:
CPLRecodeIconv(char const*, char const*, char const*) in libgdal.a(cpl_recode_iconv.o)
CPLRecodeFromWCharIconv(wchar_t const*, char const*, char const*) in libgdal.a(cpl_recode_iconv.o)
"_iconv_close", referenced from:
CPLRecodeIconv(char const*, char const*, char const*) in libgdal.a(cpl_recode_iconv.o)
CPLRecodeFromWCharIconv(wchar_t const*, char const*, char const*) in libgdal.a(cpl_recode_iconv.o)
"_iconv_open", referenced from:
CPLRecodeIconv(char const*, char const*, char const*) in libgdal.a(cpl_recode_iconv.o)
CPLRecodeFromWCharIconv(wchar_t const*, char const*, char const*) in libgdal.a(cpl_recode_iconv.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[1]: *** [gdalinfo] Error 1
make: *** [apps-target] Error 2