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===================================================================
How To Build On ARM
===================================================================
Introduction
============
This document contains information about building/testing LLVM and
Clang on an ARM machine.
This document is *NOT* tailored to help you cross-compile LLVM/Clang
to ARM on another architecture, for example an x86_64 machine. To find
out more about cross-compiling, please check :doc:`HowToCrossCompileLLVM`.
Notes On Building LLVM/Clang on ARM
=====================================
Here are some notes on building/testing LLVM/Clang on ARM. Note that
ARM encompasses a wide variety of CPUs; this advice is primarily based
on the ARMv6 and ARMv7 architectures and may be inapplicable to older chips.
#. If you are building LLVM/Clang on an ARM board with 1G of memory or less,
please use ``gold`` rather then GNU ``ld``.
Building LLVM/Clang with ``--enable-optimized``
is preferred since it consumes less memory. Otherwise, the building
process will very likely fail due to insufficient memory. In any
case it is probably a good idea to set up a swap partition.
#. If you want to run ``make
check-all`` after building LLVM/Clang, to avoid false alarms (eg, ARCMT
failure) please use at least the following configuration:
.. code-block:: bash
$ ../$LLVM_SRC_DIR/configure --with-abi=aapcs-vfp
#. The most popular linaro/ubuntu OS's for ARM boards, eg, the
Pandaboard, have become hard-float platforms. The following set
of configuration options appears to be a good choice for this
platform:
.. code-block:: bash
./configure --build=armv7l-unknown-linux-gnueabihf \
--host=armv7l-unknown-linux-gnueabihf \
--target=armv7l-unknown-linux-gnueabihf --with-cpu=cortex-a9 \
--with-float=hard --with-abi=aapcs-vfp --with-fpu=neon \
--enable-targets=arm --enable-optimized --enable-assertions
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