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Source

git clone http://llvm.org/git/llvm.git
# upstream is SVN so always rebase master
git config branch.master.rebase true
# clangc
cd tools
git clone http://llvm.org/git/clang.git
git config branch.master.rebase true

Build

Prerequisites

sudo apt-get build-dep llvm clang
sudo apt-get install ninja-build ccache

Extra RAM

Had 4GB with 6GB zram0. Bumping zram0 to 8GB worked. 

cat /sys/block/zram0/disksize   # current size, readonly while in use
swapoff /dev/zram0
rmmod zram  # what's the proper way to disable a zram dev?
modprobe zram
echo 8G > /sys/block/zram0/disksize
mkswap /dev/zram0
swapon /dev/zram0

Compile

mkdir build && cd build
cmake -G Ninja \
    -DLLVM\_TARGETS\_TO_BUILD="X86;MSP430" \
    -DCMAKE\_INSTALL\_PREFIX=/usr/local \
    -DLLVM\_BUILD\_LLVM_DYLIB=true \
    ../
ninja

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