1 .. _how_to_build_on_arm:
3 ===================================================================
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7 .. sectionauthor:: Wei-Ren Chen (陳韋任) <chenwj@iis.sinica.edu.tw>
12 This document contains information about building/testing LLVM and
15 Notes On Building LLVM/Clang on ARM
16 =====================================
17 Here are some notes on building/testing LLVM/Clang on ARM. Note that
18 ARM encompasses a wide variety of CPUs; this advice is primarily based
19 on the ARMv6 and ARMv7 architectures and may be inapplicable to older chips.
21 #. If you are building LLVM/Clang on an ARM board with 1G of memory or less,
22 please use ``gold`` rather then GNU ``ld``.
23 Building LLVM/Clang with ``--enable-optimized``
24 is prefered since it consumes less memory. Otherwise, the building
25 process will very likely fail due to insufficient memory. In any
26 case it is probably a good idea to set up a swap partition.
28 #. If you want to run ``make
29 check-all`` after building LLVM/Clang, to avoid false alarms (eg, ARCMT
30 failure) please use at least the following configuration:
34 $ ../$LLVM_SRC_DIR/configure --with-abi=aapcs-vfp
36 #. The most popular linaro/ubuntu OS's for ARM boards, eg, the
37 Pandaboard, have become hard-float platforms. The following set
38 of configuration options appears to be a good choice for this
43 ./configure --build=armv7l-unknown-linux-gnueabihf
44 --host=armv7l-unknown-linux-gnueabihf
45 --target=armv7l-unknown-linux-gnueabihf --with-cpu=cortex-a9
46 --with-float=hard --with-abi=aapcs-vfp --with-fpu=neon
47 --enable-targets=arm --disable-optimized --enable-assertions