resurrected LLVM "C Backend", with improvements
This version of the LLVM-CBE library works with LLVM 3.5.0. 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) and Mac OS X.
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 3.5.0 release version.
Note: to convert C to LLVM IR to run the tests, you will also need the clang compiler.
As llvm-cbe is a prototype library, we only use it with debugging enabled. A sample of commands to do that is as follows:
cd $HOME
git clone https://github.com/llvm-mirror/llvm
cd llvm
git checkout release_35
./configure
make ENABLE_OPTIMIZED=0 DEBUG_SYMBOLS=1
Sample commands to download and compile llvm-cbe are:
cd $HOME/llvm/projects
git clone https://github.com/vtjnash/llvm-cbe.git llvm-cbe
cd ..
make ENABLE_OPTIMIZED=0 DEBUG_SYMBOLS=1
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/Debug+Asserts/bin/llvm-cbe main.ll
$ gcc -o main.cbe main.cbe.c
$ ls
main.c main.cbe main.cbe.c main.ll
$ ./main.cbe