Instructions for building LLVM

For more detailed version, have a look at the following link.

Download and unzip llvm sources

  wget http://llvm.org/releases/3.9.1/llvm-3.9.1.src.tar.xz
  tar xfv llvm-3.9.1.src.tar.xz

Create a build folder for llvm build
```
  mkdir llvm-build
```

Generate CMake files

  cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=prefix=/install/path

Make with one of the following commands (serial or parallel)
```
  make
  make -j4 # multiple threads 
```
Install
```
  sudo make install
```

Creating LLVM Pass

The structure of the pass should look like the following link LLVM pass.

It is a good starting point for learning how to add LLVM passes. The following commands must be run from llvm-pass-skeleton/passName/. (Make sure that CMakeLists.txt exists in llvm-pass-skeleton and passName folders. )

  cmake ..
  make 
  clang -Xclang -load -Xclang /path/to/libpass*.so *.c