Add library path.


git-svn-id: https://root.cern.ch/svn/root/trunk@49350 27541ba8-7e3a-0410-8455-c3a389f83636
Don't test the sizeof(c'tor) but the sizeof(type)...


git-svn-id: https://root.cern.ch/svn/root/trunk@49351 27541ba8-7e3a-0410-8455-c3a389f83636
Add a nested transaction if not reusing.


git-svn-id: https://root.cern.ch/svn/root/trunk@49352 27541ba8-7e3a-0410-8455-c3a389f83636
Build clang if LLVMDEV.


git-svn-id: https://root.cern.ch/svn/root/trunk@49353 27541ba8-7e3a-0410-8455-c3a389f83636