Now that autoconf support is gone and with it the "update" target
(still mentioned in the "Getting started" document:
http://clang.llvm.org/get_started.html), what is the recommended way
to update llvm, clang and any other project (clang-tools-extra,
compiler-rt, etc.) from Subversion? Do I have to change manually into
the appropriate directories and issue "svn up" ?