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LLVM setup

The instructions for setting up LLVM are borrowed from here


# locations, e.g.
export WORKDIR=~/wasm
export INSTALLDIR=$WORKDIR/llvm-inst
mkdir -p $INSTALLDIR

# checkout LLVM
cd $WORKDIR
svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm

# checkout clang
cd $WORKDIR/llvm/tools
svn co http://llvm.org/svn/llvm-project/cfe/trunk clang

# build folder (~14 min; ~1 hour /wo -j)
mkdir $WORKDIR/llvm-build
cd $WORKDIR/llvm-build
cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$INSTALLDIR -DLLVM_TARGETS_TO_BUILD= -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly $WORKDIR/llvm
make -j 8

# install llvm
make install

Build and install binaryen

cd $WORKDIR
git clone https://github.com/WebAssembly/binaryen.git
mkdir -p binaryen/build
cd binaryen/build

cmake -DCMAKE_INSTALL_PREFIX=$WORKDIR -DCMAKE_BUILD_TYPE=Debug  ..
make -j8
make install

Build and install webassembly binary toolkit

cd $WORKDIR
git clone https://github.com/WebAssembly/wabt.git
mkdir -p wabt/build
cd wabt
git submodule update --init
cd build

cmake -DCMAKE_INSTALL_PREFIX=$WORKDIR ..
make -j8
make install

Once this is done you need to add the installed tools to your path:

export PATH=$PATH:$WORKDIR/bin
export WASM_TOOLCHAIN=$WORKDIR/llvm-inst/bin/

If all went fine you shold be able to compile the examples in the examples/wasm folder.