ufz/ogs — pull request #184 by norihiro-w (2013-08-09 16:23:26+00:00)
Title: Get clang version in CMake

When trying to use clang, I got an error in CMake because CMake didn't set a variable CLANG_VERSION_STRING. I'm not sure if the issue is general or happens only with me (CMake 2.8.9, clang 3.4, ubuntu 12.10). If it's general, we can fix it with this commit.