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===================================================================
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How To Build On ARM
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===================================================================
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Introduction
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============
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This document contains information about building/testing LLVM and
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Clang on ARM.
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Notes On Building LLVM/Clang on ARM
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=====================================
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Here are some notes on building/testing LLVM/Clang on ARM. Note that
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ARM encompasses a wide variety of CPUs; this advice is primarily based
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on the ARMv6 and ARMv7 architectures and may be inapplicable to older chips.
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#. If you are building LLVM/Clang on an ARM board with 1G of memory or less,
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please use ``gold`` rather then GNU ``ld``.
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Building LLVM/Clang with ``--enable-optimized``
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is prefered since it consumes less memory. Otherwise, the building
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process will very likely fail due to insufficient memory. In any
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case it is probably a good idea to set up a swap partition.
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#. If you want to run ``make
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check-all`` after building LLVM/Clang, to avoid false alarms (eg, ARCMT
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failure) please use at least the following configuration:
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.. code-block:: bash
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$ ../$LLVM_SRC_DIR/configure --with-abi=aapcs-vfp
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#. The most popular linaro/ubuntu OS's for ARM boards, eg, the
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Pandaboard, have become hard-float platforms. The following set
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of configuration options appears to be a good choice for this
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platform:
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.. code-block:: bash
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./configure --build=armv7l-unknown-linux-gnueabihf
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--host=armv7l-unknown-linux-gnueabihf
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--target=armv7l-unknown-linux-gnueabihf --with-cpu=cortex-a9
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--with-float=hard --with-abi=aapcs-vfp --with-fpu=neon
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--enable-targets=arm --disable-optimized --enable-assertions
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