Clang is finally co installable on Debian. 3.4, 3.5 and the current trunk (snapshot) can be installed together.

So, just like gcc, the different version can be called with clang-3.4, clang-3.5 or clang-3.6.

/usr/bin/clang, /usr/bin/clang++, /usr/bin/scan-build and /usr/bin/scan-view are now handled through the llvm-defaults package.

llvm-defaults is also now managing clang-check, clang-tblgen, c-index-test, clang-apply-replacements, clang-tidy, pp-trace and clang-query.

Changes are also available on llvm.org/apt/.
The next step will be to manage also llvm-defaults on llvm.org/apt to simplify the transition for people using these packages.

So, with:

# /etc/apt/sources.list
deb http://llvm.org/apt/unstable/ llvm-toolchain main
deb http://llvm.org/apt/unstable/ llvm-toolchain-3.4 main
deb http://llvm.org/apt/unstable/ llvm-toolchain-3.5 main

$ apt-get install clang-3.4 clang-3.5 clang-3.6

$ clang-3.4 --version
Debian clang version 3.4.2 (branches/release_34) (based on LLVM 3.4.2)
Target: x86_64-pc-linux-gnu
Thread model: posix


$ clang-3.5 --version
Debian clang version 3.5.0-+rc2-1~exp1 (tags/RELEASE_350/rc2) (based on LLVM 3.5.0)
Target: x86_64-pc-linux-gnu
Thread model: posix


$ clang-3.6 --version
Debian clang version 3.6.0-svn214990-1~exp1 (trunk) (based on LLVM 3.6.0)
Target: x86_64-pc-linux-gnu
Thread model: posix