1 =================================================================== 2 How To Build On ARM 3 =================================================================== 4 5 Introduction 6 ============ 7 8 This document contains information about building/testing LLVM and 9 Clang on ARM. 10 11 Notes On Building LLVM/Clang on ARM 12 ===================================== 13 Here are some notes on building/testing LLVM/Clang on ARM. Note that 14 ARM encompasses a wide variety of CPUs; this advice is primarily based 15 on the ARMv6 and ARMv7 architectures and may be inapplicable to older chips. 16 17 #. If you are building LLVM/Clang on an ARM board with 1G of memory or less, 18 please use ``gold`` rather then GNU ``ld``. 19 Building LLVM/Clang with ``--enable-optimized`` 20 is prefered since it consumes less memory. Otherwise, the building 21 process will very likely fail due to insufficient memory. In any 22 case it is probably a good idea to set up a swap partition. 23 24 #. If you want to run ``make 25 check-all`` after building LLVM/Clang, to avoid false alarms (eg, ARCMT 26 failure) please use at least the following configuration: 27 28 .. code-block:: bash 29 30 $ ../$LLVM_SRC_DIR/configure --with-abi=aapcs-vfp 31 32 #. The most popular linaro/ubuntu OS's for ARM boards, eg, the 33 Pandaboard, have become hard-float platforms. The following set 34 of configuration options appears to be a good choice for this 35 platform: 36 37 .. code-block:: bash 38 39 ./configure --build=armv7l-unknown-linux-gnueabihf \ 40 --host=armv7l-unknown-linux-gnueabihf \ 41 --target=armv7l-unknown-linux-gnueabihf --with-cpu=cortex-a9 \ 42 --with-float=hard --with-abi=aapcs-vfp --with-fpu=neon \ 43 --enable-targets=arm --enable-optimized --enable-assertions 44
