resurrected LLVM "C Backend", with improvements
This version of the LLVM-CBE library works with LLVM 3.7. You will have to compile this version of LLVM before you try to use LLVM-CBE. This guide will walk you through the compilation and installation of both tools and show usage statements to verify that the LLVM-CBE library is compiled correctly.
The library is known to compile on various Linux versions (Redhat, Mageia, Ubuntu, Debian), Mac OS X, and Windows (Mingw-w64).
Step 1: Installing LLVM
LLVM-CBE relies on specific LLVM internals, and so it is best to use it with a specific revision of the LLVM development tree. Currently, llvm-cbe works with the LLVM 3.7 release versions and autotools.
Note: to convert C to LLVM IR to run the tests, you will also need a C compiler such as clang.
The first step is to compile LLVM on your machine (this assumes an in-tree build, but out-of-tree will also work):
cd $HOME git clone https://github.com/llvm-mirror/llvm cd llvm git checkout release_37 ./configure make
Step 2: Compiling LLVM-CBE
Next, download and compile llvm-cbe from the same folder:
cd $HOME/llvm/projects git clone https://github.com/JuliaComputing/llvm-cbe.git llvm-cbe cd .. make
Step 3: Usage Examples
If llvm-cbe compiles, you should be able to run it with the following commands.
$ cd llvm/lib/test/selectionsort $ ls main.c $ clang -S -emit-llvm main.c $ ls main.c main.ll $ $(HOME)/llvm/Release/bin/llvm-cbe main.ll
Compile Generated C-Code and Run
$ gcc -o main.cbe main.cbe.c $ ls main.c main.cbe main.cbe.c main.ll $ ./main.cbe