install-llvm.txt

0. Prerequisite
sudo apt-get install bison flex libboost-dev texinfo

1. Build binutils
git clone git://sourceware.org/git/binutils-gdb.git
cd binutils-gdb/
mkdir build
cd build
../configure --prefix=${INSTALL} --enable-gold --enable-plugins --disable-werror
make all-gold all-binutils
make install-gold install-binutils


2. How to build llvm
download llvm and clang source code
llvm: http://releases.llvm.org/5.0.0/llvm-5.0.0.src.tar.xz
clang: http://releases.llvm.org/5.0.0/cfe-5.0.0.src.tar.xz


mv cfe-5.0.0.src llvm-5.0.0.src/tools/clang
cd llvm-5.0.0.src
mkdir build
cd build
cmake -DLLVM_BINUTILS_INCDIR=${PATH_TO_BINUTIL_SOURCE}/include -DCMAKE_INSTALL_PREFIX=${SAME_PATH_AS_BINUTILS}  ${PATH_TO_LLVM_SOURCE_ROOT}


cmake --build .
cmake --build . --target install


cd ${INSTALL}/lib
mkdir bfd-plugins
cp libLTO.so LLVMgold.so ./bfd-plugins
cd ${INSTALL}/bin
ln -s ./ld.gold ./ld
export PATH=${INSTALL}/bin:$PATH


3. Test
Try command in Example of link time optimization
In http://llvm.org/docs/GoldPlugin.html