How do I use the ARM assembler in XCode?

Question

Just for educational purposes, I would like to add a function to an existing iPhone app, written in ARM assembly. I don\'t need a tutorial on ARM assembly in general, becaus

Answer 1

You can emulate ARM-Ubuntu with QEmu (there are some Windows ports of it, e.g. http://lassauge.free.fr/qemu/ ). If you are on Windows, you may need to emulate x86_64-Ubuntu in the middle. To create an ARM image you can follow the steps from this question: Black screen in QEmu for ARM-Ubuntu (how to get GUI?) (yes, unfortunately, you get no GUI with these steps, just a console to the ARM-Ubuntu machine, and you have to do the steps from Ubuntu). Then you can cross-compile your C++/C/Assembly programs from Windows/Ubuntu host to ARM-Ubuntu target.

clang++.exe -Wall test1.cpp -o test1exe -std=c++14 -Ipath-to-arm-linaro/arm-linux-gnueabihf/include/c++/5.3.1 -Ipath-to-arm-linaro/arm-linux-gnueabihf/include/c++/5.3.1/arm-linux-gnueabihf -ffunction-sections -fdata-sections --sysroot=path-to-arm-linaro/arm-linux-gnueabihf/libc --target=arm-unknown-linux-gnueabihf -Bpath-to-arm-linaro/arm-linux-gnueabihf/bin/

For cross-compilation you would need to download and roll out a toolchain, e.g. gcc-linaro-5.3-2016.02-i686-mingw32_arm-linux-gnueabihf.tar.xz (Windows/MinGW) from https://releases.linaro.org/components/toolchain/binaries/latest-5/arm-linux-gnueabihf/ and replace "path-to-arm-linaro" in the above command with the path to the toolchain.