Friday, April 17, 2009

clang compiler quickstart

Have you ever heard about clang ? It's a new compiler for C, C++ and Objective C languages. clang is being developed in a fast pace and is expected to become an alternative for the gcc compilers.

What are its advantages ? It's a compiler written from scratch, its code is completely modular and easily readable, it aims to offer user-friendly expressive diagnostics, it's much smaller and faster than gcc, it's expected to support IDE integration and code analysis and it's compatible with gcc. The C part of the compiler is in an advanced stage and can build large projects, like sqlite and the FreeBSD kernel. The C++ part is in an early stage (clang can't compile itself, for example).

Quick start:

$ svn co llvm
$ cd llvm/tools
$ svn co clang
$ cd ..
$ ./configure --prefix=/opt/clang
$ make
$ sudo make install

In the sequence above, llvm is the compiler back end and clang is the compiler front end. The compiler is installed in the /opt/clang directory, so it's available at /opt/clang/bin/clang (the directory can be deleted for a full uninstall when you're done).

Try it out:

$ cat hello.c
#include "stdio.h"

int main (void) {
printf("Hello world!\n");
return 0;
$ /opt/clang/bin/clang -o hello hello.c
$ ./hello
Hello world!
$ tar xf lame-398-2.tar.gz
$ cd lame-398-2
$ ./configure --prefix=/opt/lame CC=/opt/clang/bin/clang
$ make
$ sudo make install
$ /opt/lame/bin/lame myaudio.wav

As you can see, clang is in development stage, so it's only available trough svn.

Do you want to contribute ? See more information at clang home page !

No comments: