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    <h1>Note</h1> <p>This response was written some time ago and mo longer works with Xcode 6 and up. Please <a href="http://www.hurtsdevelopment.com/blog/uncategorized/gdal-on-ios-it-works/" rel="nofollow">check this link</a> for a more current answer to this problem.</p> <h1>Introduction</h1> <p>Incorporating GDAL into your iOS app is a 5 steps process:</p> <ol> <li>Download the GDAL source code from the GDAL website</li> <li>Run the configure/build/install script given below</li> <li>Add the resulting static library into your iOS project along with the include files</li> <li>Link with additional libraries in your iOS project</li> <li>Start coding... the GDAL and OGR tutorials are good starting points</li> </ol> <h1>Downloading GDAL</h1> <p>GDAL is a C++ open source library which can be downloaded from the <a href="http://www.gdal.org" rel="nofollow">www.gdal.org web site</a>. At the time of writing the latest version is 1.9.0. You should download the latest stable version if possible.</p> <h1>Run the script to compile GDAL for iOS and the simulator</h1> <p>In order to use GDAL in your iOS project you need to compile the source code as a static library (.a). With the latest iOS6-supported architecture you should create the static library for the following architectures:</p> <ul> <li>i386 for the simulator</li> <li>armv7 for iPhone 3GS to iPhone 4S</li> <li>armv7s for iPhone 5</li> </ul> <h2>Base script to build for 1 architecture</h2> <p>The following script, which is adapted from <a href="http://pseudogreen.org/blog/build_autoconfed_libs_for_iphone.html" rel="nofollow">pseudogreen</a>'s does the trick of compiling the source code for a single architecture.</p> <p>Copy paste this code into a text editor and save it as file with .sh extension: for instance build_gdal_ios.sh.</p> <p>To use it copy the script into the directory where you downloaded the gdal source code and run it as follows:</p> <ul> <li><p>To build the library for the simulator:</p> <pre><code>`sh build_gdal_ios.sh -p "location where you want to save the resulting files" simulator` </code></pre></li> <li><p>To build it for the device:</p> <pre><code>`sh build_gdal_ios.sh -p "location where you want to save the resulting files" -a "architecture" device` </code></pre></li> </ul> <p>You can also type <code>sh build_gdal_ios.sh -h</code> to get the help.</p> <pre><code> #!/bin/bash ################################################################################ # # Copyright (c) 2008-2009 Christopher J. Stawarz # # Permission is hereby granted, free of charge, to any person # obtaining a copy of this software and associated documentation files # (the "Software"), to deal in the Software without restriction, # including without limitation the rights to use, copy, modify, merge, # publish, distribute, sublicense, and/or sell copies of the Software, # and to permit persons to whom the Software is furnished to do so, # subject to the following conditions: # # The above copyright notice and this permission notice shall be # included in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS # BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN # ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. # ################################################################################ # Disallow undefined variables set -u default_gcc_version=4.2 default_iphoneos_version=6.0 default_macos_version=10.8 default_architecture=armv7 default_prefix="${HOME}/Documents/iOS_GDAL" GCC_VERSION="${GCC_VERSION:-$default_gcc_version}" export IPHONEOS_DEPLOYMENT_TARGET="${IPHONEOS_DEPLOYMENT_TARGET:-$default_iphoneos_version}" export MACOSX_DEPLOYMENT_TARGET="${MACOSX_DEPLOYMENT_TARGET:-$default_macos_version}" DEFAULT_ARCHITECTURE="${DEFAULT_ARCHITECTURE:-$default_architecture}" DEFAULT_PREFIX="${HOME}/Documents/iOS_GDAL" echo Default architecture: $DEFAULT_ARCHITECTURE usage () { cat &gt;&amp;2 &lt;&lt; EOF Usage: ${0##*/} [-ht] [-p prefix] [-a arch] target [configure_args] -h Print help message -p Installation prefix (default: \$HOME/Documents/iOS_GDAL...) -t Use 16-bit Thumb instruction set (instead of 32-bit ARM) -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: GCC_VERSION (default: $default_gcc_version) IPHONEOS_DEPLOYMENT_TARGET (default: $default_iphoneos_version) MACOSX_DEPLOYMENT_TARGET (default: $default_macos_version) DEFAULT_PREFIX (default: $default_prefix) EOF } prefix="${DEFAULT_PREFIX}" echo Prefix: $prefix while getopts ":hp:a:t" opt; do case $opt in h ) usage ; exit 0 ;; p ) prefix="$OPTARG" ;; t ) thumb_opt=thumb ;; a ) DEFAULT_ARCHITECTURE="$OPTARG" ;; \? ) usage ; exit 2 ;; esac done shift $(( $OPTIND - 1 )) if (( $# &lt; 1 )); then usage exit 2 fi target=$1 shift case $target in device ) arch="${DEFAULT_ARCHITECTURE}" platform=iPhoneOS extra_cflags="-m${thumb_opt:-no-thumb} -mthumb-interwork" ;; simulator ) arch=i386 platform=iPhoneSimulator extra_cflags="-D__IPHONE_OS_VERSION_MIN_REQUIRED=${IPHONEOS_DEPLOYMENT_TARGET%%.*}0000" ;; * ) echo No target found!!! usage exit 2 esac platform_dir="/Applications/Xcode.app/Contents/Developer/Platforms/${platform}.platform/Developer" platform_bin_dir="${platform_dir}/usr/llvm-gcc-${GCC_VERSION}/bin" platform_sdk_dir="${platform_dir}/SDKs/${platform}${IPHONEOS_DEPLOYMENT_TARGET}.sdk" prefix="${prefix}/${arch}/${platform}.platform/${platform}${IPHONEOS_DEPLOYMENT_TARGET}.sdk" echo library will be exported to $prefix export CC="${platform_bin_dir}/llvm-gcc-${GCC_VERSION}" export CFLAGS="-arch ${arch} -pipe -Os -gdwarf-2 -isysroot ${platform_sdk_dir} ${extra_cflags}" export LDFLAGS="-arch ${arch} -isysroot ${platform_sdk_dir}" export CXX="${platform_bin_dir}/llvm-g++-${GCC_VERSION}" export CXXFLAGS="${CFLAGS}" export CPP="${platform_bin_dir}/llvm-cpp-${GCC_VERSION}" export CXXCPP="${CPP}" ./configure \ --prefix="${prefix}" \ --host="${arch}-apple-darwin" \ --disable-shared \ --enable-static \ --with-unix-stdio-64=no \ "$@" || exit make install || exit cat &gt;&amp;2 &lt;&lt; EOF Build succeeded! Files were installed in $prefix EOF </code></pre> <p>Notice that this script has a few default parameters which you can change to reflect your preferences or changes in the SDK or LLVM Apple compiler:</p> <ul> <li>default_gcc_version=4.2</li> <li>default_iphoneos_version=6.0</li> <li>default_macos_version=10.8</li> <li>default_architecture=armv7</li> <li>default_prefix="${HOME}/Documents/GDALLibrary"</li> </ul> <h2>And now building for multiple architectures</h2> <p>Using the preceding script (<code>build_gdal_ios.sh</code>) allows you to build one architecture at a time... You need to compile for 3 and then bring all these libraries together under one single static library file.</p> <p>The following script allows just that (save it to another name such as build_gdal_all_ios.sh):</p> <pre><code>#!/bin/bash make clean ./build_gdal_ios.sh -p ${HOME}/Documents/GDALLibrary -a armv7 device make clean ./build_gdal_ios.sh -p ${HOME}/Documents/GDALLibrary -a armv7s device make clean ./build_gdal_ios.sh -p ${HOME}/Documents/GDALLibrary simulator </code></pre> <p>After running this script you will have your libraries saved in your ${HOME}/Documents/GDALLibrary directory in subfolders:</p> <ul> <li>${HOME}/Documents/GDALLibrary/i386/iPhoneSimulator.platform/iPhoneSimulator6.0.sdk/lib</li> <li>${HOME}/Documents/GDALLibrary/armv7/iPhoneOS.platform/iPhoneSimulator6.0.sdk/lib</li> <li>${HOME}/Documents/GDALLibrary/armv7s/iPhoneOS.platform/iPhoneSimulator6.0.sdk/lib</li> </ul> <p>You can now use the executable lipo (for liposuction) to join the 3 libraries into a single one like so:</p> <pre><code>lipo ${HOME}/Documents/GDALLibrary/i386/iPhoneSimulator.platform/iPhoneSimulator6.0.sdk/lib/libgdal.a ${HOME}/Documents/GDALLibrary/armv7/iPhoneOS.platform/iPhoneSimulator6.0.sdk/lib/libgdal.a ${HOME}/Documents/GDALLibrary/armv7s/iPhoneOS.platform/iPhoneSimulator6.0.sdk/lib/libgdal.a -output ${HOME}/Documents/GDALLibrary/libgdal.a -create </code></pre> <p>... And you're done...</p> <h1>Add the static library to your XCode project</h1> <p>This step is rather straightforward:</p> <ol> <li>Create a new project in Xcode (4.5) or open the one you want to add GDAL to</li> <li>In the file explorer right click and select "Add files to projects"</li> <li>Select the libgdal.a created above along with the include files in one of the include directories (the 3 directories contain the same files)</li> <li>Add the following libraries to your XCode project (from the project framework list): <ul> <li>libstdc++.6.0.9.dylib</li> <li>libz.dylib</li> <li>libiconv.dylib</li> <li>libsqlite3.dylib</li> <li>libxml2.dylib (if Undefined symbols for architecture armv7: "_xmlCatalogResolveSystem" etc)</li> </ul></li> </ol> <p>Build your code. All should compile without trouble.</p> <h1>Start coding</h1> <p>There is a trick here: you are using a C++ library (and header files) in an Objective-C environment. If you include one of the GDAL header files into a .m file XCode will complain about the C++ syntax.</p> <p>Here you have two solutions:</p> <ol> <li>Write all your GDAL code inside .mm files which Xcode will then recognize as Objective-C++ files and will compile</li> <li>Use a class extension in your Objective-C files as described by Phil Jordan on his excellent article <a href="http://www.philjordan.eu/article/mixing-objective-c-c++-and-objective-c++" rel="nofollow">Mixing Objective-C++ and C++</a></li> </ol> <p>At one point I will be posting some GDAL code samples... but later...</p>
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