OpenMP support in Clang 3.5 (Simone Atzeni)

Hi Simone,
Currently trunk version of clang does not support OpenMP (we'll try to add support of OpenMP in trunk ASAP). You can use 3.4-based version of clang with OpenMP support from https://clang-omp.github.io/.
Also there you can find trunk-based version of clang with OpenMP support (see repositories clang_trunk, compiler-rt_trunk and llvm_trunk) maintained by Hal Finkel.

Best regards,
Alexey Bataev