Package: clang-format-3.4

"clang-format-3.4" package binaries on Debian:

/usr/bin/clang-format-3.4 /usr/bin/clang-format-diff-3.4 /usr/lib/llvm-3.4/bin/clang-format

You may install this package on Debian with apt-get install clang-format-3.4