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    copied!<p>I'm gonna try to write this as a tutorial for you so it becomes easy to follow.</p> <h2>Pre-requirements</h2> <p>Before you start you need to make sure the following is installed:</p> <pre><code>apt-get install git rsync cmake ia32-libs </code></pre> <h2>Let's cross compile a Pie!</h2> <p>Start with making a folder in your home directory called <code>raspberrypi</code>.</p> <p>Go in to this folder and pull down the ENTIRE tools folder you mentioned above:</p> <pre><code>git clone git://github.com/raspberrypi/tools.git </code></pre> <p>You wanted to use the following of the 3 ones, <code>gcc-linaro-arm-linux-gnueabihf-raspbian</code>, if I did not read wrong.</p> <p>Go into your home directory and add:</p> <pre><code>export PATH=$PATH:$HOME/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin </code></pre> <p>to the end of the file named <code>~/.bashrc</code></p> <p>Now you can either log out and log back in (i.e. restart your terminal session), or run <code>. ~/.bashrc</code> in your terminal to pick up the <code>PATH</code> addition in your current terminal session.</p> <p>Now, verify that you can access the compiler <code>arm-linux-gnueabihf-gcc -v</code>. You should get something like this:</p> <pre><code>Using built-in specs. COLLECT_GCC=arm-linux-gnueabihf-gcc COLLECT_LTO_WRAPPER=/home/tudhalyas/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/../libexec/gcc/arm-linux-gnueabihf/4.7.2/lto-wrapper Target: arm-linux-gnueabihf Configured with: /cbuild/slaves/oort61/crosstool-ng/builds/arm-linux-gnueabihf-raspbian-linux/.b uild/src/gcc-linaro-4.7-2012.08/configure --build=i686-build_pc-linux-gnu --host=i686-build_pc- linux-gnu --target=arm-linux-gnueabihf --prefix=/cbuild/slaves/oort61/crosstool-ng/builds/arm-l inux-gnueabihf-raspbian-linux/install --with-sysroot=/cbuild/slaves/oort61/crosstool-ng/builds/ arm-linux-gnueabihf-raspbian-linux/install/arm-linux-gnueabihf/libc --enable-languages=c,c++,fo rtran --disable-multilib --with-arch=armv6 --with-tune=arm1176jz-s --with-fpu=vfp --with-float= hard --with-pkgversion='crosstool-NG linaro-1.13.1+bzr2458 - Linaro GCC 2012.08' --with-bugurl= https://bugs.launchpad.net/gcc-linaro --enable-__cxa_atexit --enable-libmudflap --enable-libgom p --enable-libssp --with-gmp=/cbuild/slaves/oort61/crosstool-ng/builds/arm-linux-gnueabihf-rasp bian-linux/.build/arm-linux-gnueabihf/build/static --with-mpfr=/cbuild/slaves/oort61/crosstool- ng/builds/arm-linux-gnueabihf-raspbian-linux/.build/arm-linux-gnueabihf/build/static --with-mpc =/cbuild/slaves/oort61/crosstool-ng/builds/arm-linux-gnueabihf-raspbian-linux/.build/arm-linux- gnueabihf/build/static --with-ppl=/cbuild/slaves/oort61/crosstool-ng/builds/arm-linux-gnueabihf -raspbian-linux/.build/arm-linux-gnueabihf/build/static --with-cloog=/cbuild/slaves/oort61/cros stool-ng/builds/arm-linux-gnueabihf-raspbian-linux/.build/arm-linux-gnueabihf/build/static --wi th-libelf=/cbuild/slaves/oort61/crosstool-ng/builds/arm-linux-gnueabihf-raspbian-linux/.build/a rm-linux-gnueabihf/build/static --with-host-libstdcxx='-L/cbuild/slaves/oort61/crosstool-ng/bui lds/arm-linux-gnueabihf-raspbian-linux/.build/arm-linux-gnueabihf/build/static/lib -lpwl' --ena ble-threads=posix --disable-libstdcxx-pch --enable-linker-build-id --enable-plugin --enable-gol d --with-local-prefix=/cbuild/slaves/oort61/crosstool-ng/builds/arm-linux-gnueabihf-raspbian-li nux/install/arm-linux-gnueabihf/libc --enable-c99 --enable-long-long Thread model: posix gcc version 4.7.2 20120731 (prerelease) (crosstool-NG linaro-1.13.1+bzr2458 - Linaro GCC 2012.08 ) </code></pre> <h2>But hey! I did that and the libs still don't work!</h2> <p>We're not done yet! So far, we've only done the basics.</p> <p>In your <code>raspberrypi</code> folder, make a folder called <code>rootfs</code>.</p> <p>Now you need to copy the entire <code>/lib</code>and <code>/usr</code> directory to this newly created folder. I usually bring the rpi image up and copy it via rsync:</p> <pre><code>rsync -rl --delete-after --safe-links pi@192.168.1.PI:/{lib,usr} $HOME/raspberrypi/rootfs </code></pre> <p>where <code>192.168.1.PI</code> is replaced by the IP of your Raspberry Pi.</p> <p>Now, we need to write a <code>cmake</code> config file. Open <code>~/home/raspberrypi/pi.cmake</code> in your favorite editor and insert the following:</p> <pre><code>SET(CMAKE_SYSTEM_NAME Linux) SET(CMAKE_SYSTEM_VERSION 1) SET(CMAKE_C_COMPILER $ENV{HOME}/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-gcc) SET(CMAKE_CXX_COMPILER $ENV{HOME}/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++) SET(CMAKE_FIND_ROOT_PATH $ENV{HOME}/raspberrypi/rootfs) SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER) SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY) </code></pre> <p>Now you should be able to compile your <code>cmake</code> programs simply by adding this extra flag: <code>-D CMAKE_TOOLCHAIN_FILE=$HOME/raspberrypi/pi.cmake</code>. </p> <p>Using a <a href="https://github.com/jameskbride/cmake-hello-world">cmake hello world</a> example:</p> <pre><code>git clone https://github.com/jameskbride/cmake-hello-world.git cd cmake-hello-world mkdir build cd build cmake -D CMAKE_TOOLCHAIN_FILE=$HOME/raspberrypi/pi.cmake ../ make scp CMakeHelloWorld pi@192.168.1.PI:/home/pi/ ssh pi@192.168.1.PI ./CMakeHelloWorld </code></pre>
 

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