CrossCompile

VC4C / VC4CL

Configure CMake:

• Set CROSS_COMPILE to ON
• Set SYSROOT_CROSS to the path containing your library for the target platform
• Set CROSS_COMPILER_PATH to the path containing the cross-compiler (e.g. usr/bin)
• Set CROSS_COMPILER_PREFIX to the prefix all command of the cross-compiler have (e.g. armv6-rpi-linux-gnueabihf-) or set to empty for no prefix

Khronos SPIRV-LLVM (deprecated)

Source

Assumptions:

• The Khronos SPIRV-LLVM was built (for the host-architecture!) into path /opt/SPIRV-LLVM/build
• The SPIRV-LLVM source is in /opt/SPIRV-LLVM/
• The Raspberry Pi cross-compiler is in /opt/rasperrypi/tools

1. Run this command (adjust if necessary) in the directory to build the cross-compiled tools (i.e. /tmp/SPIRV-LLVM): cmake -G "Unix Makefiles" -DCMAKE_C_COMPILER=/opt/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-gcc -DCMAKE_CXX_COMPILER=/opt/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-g++ -DCMAKE_SYSTEM_NAME=Linux -DCMAKE_FIND_ROOT_PATH="/opt/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64 /opt/raspberrypi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/arm-linux-gnueabihf" -DCMAKE_CROSSCOMPILING=True -DLLVM_TABLEGEN=/opt/SPIRV-LLVM/build/bin/llvm-tblgen -DCLANG_TABLEGEN=/opt/SPIRV-LLVM/build/bin/clang-tblgen -DLLVM_DEFAULT_TARGET_TRIPLE=arm-linux-gnueabihf -DLLVM_TARGET_ARCH=ARM /opt/SPIRV-LLVM/
2. Run make clang llvm-as llvm-spirv
3. Copy destination directory to Raspberry Pi
4. Set correct path to cross-compiled SPIRV-LLVM in VC4C CMakeLists.txt (setting SPIRV_COMPILER_ROOT)