LDC cross-compilation for ARM GNU/Linux
This page is outdated and we are working on much better cross-compilation support, try the new runtime cross-compilation tool instead.
This page will show you how to build a ldc cross-compiler for ARM architecture on GNU/Linux, so that you can build an executable binary with the druntime/phobos and run it on your ARM target.
- Linux host, where you'll build and run ldc.
- C/C++ toolchain, to build llvm and parts of ldc.
- A pre-built D compiler for GNU/Linux, needed because the ldc frontend is written in D.
- Common development tools, such as CMake and git, and ldc uses libconfig++
- ldc/druntime/phobos source
- llvm 3.8 source, either from the official release or git.
- GNU ARM toolchain that supports your ARM target 
- In this example, GNU ARM Embedded Toolchain 4.3.3-2009-q1 is used, installed on the host at /opt/arm-2009q1
- An ARM target with a running GNU/Linux installed on it (like an Ubuntu distribution installed on a Raspberry Pi)
curl -O http://llvm.org/releases/3.8.0/llvm-3.8.0.src.tar.xz tar xvf llvm-3.8.0.src.tar.xz mkdir llvm-3.8.0.arm_obj/ cd llvm-3.8.0.arm_obj/ cmake ../llvm-3.8.0.src -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD=ARM make -j5
Build ldc for GNU/ARM
Clone the ldc repository, check out the release-1.0.0 branch, apply the ARM patch, set the DMD environment variable to the path of your pre-built D compiler, and build ldc, druntime and phobos as usual:
cd .. git clone --recursive https://github.com/ldc-developers/ldc.git cd ldc/ git checkout -b ddmd origin/release-1.0.0 git submodule update curl -O https://gist.githubusercontent.com/claudemr/3367c13095b15d449b1591eb38d098d9/raw/3517a5db2228e57da9dd8880a82d6bfe6f0e38f1/ldc_1.0.0_gnu_arm git apply ldc_1.0.0_gnu_arm mkdir build_arm cd build_arm export DMD=/path/to/your/dmd2/linux/bin64/dmd cmake .. -DLLVM_CONFIG=../../llvm-3.8.0.arm_obj/bin/llvm-config make druntime-ldc phobos2-ldc -j5
Build a command-line executable
Now that we have a D cross-compiler and cross-compiled the standard library for GNU/ARM, let's try building a small program, the classic Hello world:
./bin/ldc2 -v -mtriple=arm-none-linux-gnueabi -gcc=/opt/arm-2009q1/bin/arm-none-linux-gnueabi-gcc helloworld.d
Push and run this program on an ARM device with GNU/Linux
Directions for future work
- Run druntime and phobos unit-tests.